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Radio-Electronics
J

THE MAGAZINE FOR NEW IDEAS IN ELECTRONICS

UIIJ 7 [

DIGIT FIFLIT

for FM /AM receivers -tells time too

PINK-NOISE
GENERATOR
build for hi -fi testing

HaIRAMCME1T
Atari- Bally -ColecoFairchild

RCA -APF

CB CIRCUITS
unusual designs
in today's sets
FM

88

;....

90

92

94

96

98

1(+0

102

aDq

106

108

CUTR
you can do

it yourself

01

70989

Computer Corners Lab Test Reports Of Sansui

AU -717 Stereo Receiver & Dual C -ui9 Cassette Deck
Hobby Corner service Clinic
r-:" ent Reports
Z -80

6ERNSBACK
PUBLICATION

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www.americanradiohistory.com

Formerly

"I'm a VIZ
circuit
tester."

"It seems like some instrument companies

expect the customer to do the quality

control testing on their instruments. I've

heard of a case where someone had to buy
three or four DMMs before he got one that
worked right. Not so with VIZ.
"We test and calibrate every instrument
before it _eaves the factory. No company
can beat that, and few come close. The
circuit- tester seal on each VIZ instrument
ensures that you're getting the highest
accuracy and long -term stability possible.
"In fact, in the two years since VIZ took

over the test instrument business, returns

for repair have been almost nonexistent.
However, should you have a problem, our
nation -wide network of sophisticated
service centers guarantees that you'll get
your instrument back fast. Check this out
with your VIZ distributor he'll confirm
our reputation.
"Because I test all circuits here, you can
be confident when you
test your circuits with
Test
VIZ instruments:'

IZ

Instruments Group

335 East Price Street Philadelphia, PA 19144 (215) VI -4 -2626

The Circuit Tester line

VIZ

Accuracy and stability assured

7000

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sho.

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Radio-Electron

ics,.

THE MAGAZINE FOR NEW IDEAS IN ELECTRONICS

Electronics publishers since 1908

JANUARY 1978

What You Need to Know About Handy Tools and Gadgets.

by Forest Belt
34 Coping With Wire & Cable
37 Handy Tools Speedup Service
40 Tricks of Soldering & Desoldering

SPECIAL
SECTION

33

BUILD ONE
OF THESE

21

Digital Frequency Display for FM /AM Tuners

Add on device reads tuned frequency directly and when the tuner
is off, the readout becomes a clock. by Gary McClellan

43

Pink Noise Generator

It's easy to build; measures only
fi testing. by Jeff Mazur

Vol. 49 No.

ON THE COVER
Sitting atop the stereo receiver
is this month's featured construction project. It provides a
digital readout of the frequency
that the receiver is tuned to.
Works with AM /FM receivers;
and, when not displaying frequency, it's a digital clock. For
complete details on how to
build your own, turn to page

cubic inches; and is great for hi-

21.

COMPUTERS

68

CB

48

GENERAL
ELECTRONICS

Z -80

Computer Corner

How the Z -80 instruction set compares to the 8080 instruction set.
by William Barden, Jr.

46

Novel CB Circuits
Unusual approaches to common transceiver problems.
by Robert F. Scott

Looking Ahead
Preview of tomorrow. by Dave Lachenbruch
Programmable TV Games
A photo report on some of the newest ones to reach the market.
by Warren Black

STEREO

66

Hobby Corner
Potpourri of hints and circuits. Something for everyone.
by Earl "Doc" Savage, K4SDS

51

Testing Hi-Fi Cartridges Yourself.

Using available test records to check -out your cartridge.
by Len Feldman

58

R -E

HIGH -FIDELITY

HANDY TOOLS AND GADGETS for the hobbyist, experimenter and service technician that
will make life a little easier and will give your
work that professional look. Story starts on
page 33.

Lab Tests Dual Cassette Deck

Dual C -939 rates an "Excellent."

TELEVISION

EQUIPMENT
REPORTS

Lab Tests Sansui Stereo receiver

Sansui AU -717 gets an "Excellent"

60

R -E

70

Jack Darr's Service Clinic

Finding a replacement power transformer.

70

Service Questions

turn to page

Jack Darr solves technician problems.

Radio-Electronics, Published monthly by Gernsback

HOW TO TEST PHONO CARTRIDGES yourself

by using readily available test records. The
waveforms shown are recorded on a test record
to test for IM distortion. For the whole story,
51.

Publications, Inc., 200 Park Avenue South. New York,

NY 10003. Phone: 212-777 -6400. Second-class postage
paid at New York, NY and additional mailing offices.
One -year subscription rate: U.S.A., U.S. possessions
and Canada, $8.75. Pan-American countries, $10.25.
Other countries. $10.75. Single copies $1.00.
1977 by
Gernsback Publications, Inc. All rights reserved. Printed

20

Simpson Model 461 Digital Multimeter

30

Triplett Model

31

Sencore CB44 Scope Frequency Converter

64 FETVOM

in U.S.A.

Subscription Service: Mail

all

subscription orders,

changes, correspondence and Postmaster Notices of

undelivered copies (Form 3579) to Radio -Electronics
Subscription Service, Box 2520, Boulder, CO 80322.

DEPARTMENTS

96
14
14
16

Advertising Index
Advertising Sales Offices
Editorial
Letters

86
6

78

Market Center
New & Timely
New Products

stamped self- addressed envelope must accompany all

submitted manuscripts and /or artwork or photographs if
their return is desired should they be rejected. We
disclaim any responsibility for the loss or damage of
manuscripts and /or artwork or photographs while in our
A

possession or otherwise.

As service to readers, Radio-Electronics publishes available plans or information relating to newsworthy products, techniques and scientific and technological developments.
Because of possible variances in the quality and condition of materials and workmanship used by readers, Radio-Electronics disclaims any responsibility tor the sate and proper
functioning of reader -built projects based upon or from plans or information published in this magazine.

www.americanradiohistory.com

looking ahead
FCC 4- channel tests:

In connection with its current

investigation of the need for discrete quadriphonic FM
broadcasting standards (see Radio -Electronics,
November, 1977), the FCC recently ran some rather
elaborate subjective listening tests with fairly surprising
results.
The Commission's laboratories compared the discrete
quadriphonic (4-4 -4) system using a 4- channel tape deck,
RCA's discrete broadcasting system (4 -3 -4) and three
matrix systems (4 -2 -4) using encoders and decoders. The
4 -2 -4 systems were CBS's SO, Sansui's QS and BBC's
"H" system.
As might be expected, the 4 -4 -4 discrete system came
out on top--but not by nearly so large a margin as might
be expected. In music -listening, 52% preferred discrete
and the remaining 48% thought SQ was better. And 58%
of the listeners preferred SQ over the H system; 61%
thought it was better than 4 -3 -4 discrete; and 77% liked it
better than QS. When asked to pinpoint the direction
from which sounds came, SQ and the other matrix
systems didn't do nearly so well as 4 -4 -4 discrete. But the
FCC researchers wonder in the report just how important
this directionality is, since many of the test panel
members preferred that the rear speakers carry "only
ambient or reverberated material," presumably because
they had been conditioned by concert -hall experiences.
Since matrix 4- channel broadcasting is permitted right
now by the FCC and discrete quadriphonics will require
elaborate rule- making, the Commission's lab tests appear
at first to favor matrix over discrete and to imply that
complex legal proceedings on discrete may be a waste of
time. But the repot t on the tests specifically notes that
"extreme care must be exercised in choosing the system
so that future developments in multi -channel sound will
not be stifled."

Zenith's problems: Zenith, America's largest

manufacturer of color and monochrome television, also
has been the most outspoken in crusading against what it
considers to be unfair competition by the Japanese TV
makers on the American market. It has emphasized that
most of its products are American -made, even though it
owns feeder plants in Mexico and Taiwan. It has been
called, in fact, the last "American" manufacturer of TV
and stereo. While its competitors gradually shifted
subassembly and some final -assembly plants to overseas
locations, Zenith has resisted the trend.
When the company found it was faced with the
possibility of a loss for the third quarter in spite of near record color TV and stereo sales, it bit the bullet and
decided it could hold out no longer. First, it eliminated all
basic research projects, continuing only developments
which lead directly to products. Then the ax really fell.
Zenith announced it would cut its U.S. payroll by about
25 %, eliminating 5,000 production jobs and 600 salaried
workers, enlarging its Mexico and Taiwan TV operations
and moving all stereo out of the U.S.

Slipped disc: Sorry to

use the headline so many times,

but it continues to be apropos of the videodisc situation.
If you recall our exciting episode of last November, you'll

remember that RCA decided it was worth postponing the

introduction date of its videodisc system in order to
extend the playing time to one hour per side, or two hours
per disc (Radio -Electronics, November, 1977). So RCA
has an indefinite introduction date for its system.
Now, along come Philips and MCA, which had been
saying for the past year that their optical videodisc
system would get its test -market premiere at the end of
1977 or the start of 1978. Suddenly they have decided it's
time for a change. They originally had planned to
introduce a one -sided disc which played for 30 minutes.
Now, like RCA, they have been bitten by the long -play
bug and have developed a two -sided disc which will play
for at least one hour. Now this will require changes in the
new player, and that will take some time. So the first
small -scale market introduction of the MCA -Philips
optical videodisc system (by Philips' subsidiary
Magnavox) is now tentatively scheduled for late '78.

Projection TV: More than

50 manufacturers are
currently assembling small-screen TV sets, lenses and
screens into simple projection TV systems. You see these
most often in bars and taverns, but a good number are
finding their way into homes. You can build your own by
buying the components from several vendors. If the room
is fairly dark, most of these systems work quite well.
These systems came along after Advent set the pace
with its three-tube system. The single -tube projector
became a relatively low- priced alternative to Advent. Now
we're going to start to see a large number of three -tube
Advent competitors. First, there is the unit by Projection
Systems Inc. (PSI), selling for a little more than some of
the Advents ($5,000 and up), but providing an excellent
picture. Unique systems using various new ideas, but
basically representing three -tube projectors, will be
offered soon by Electronic Systems Products and Mary
Hodges Instruments. These are not very well -known firms.

So who else is in the race? Well, the Japanese are.

Mitsubishi very soon will offer a system called "VSS" (for
Video Scan System) here in the U.S. at somewhat less
than $3,000. Panasonic will have its own three -tube
system in a one -piece furniture unit, for sale here
probably some time in 1978. Sharp has shown a three tube projector in Japan and presumably will offer it in the
U.S. Sony, which has long had a one -tube projector, is
expected to add a multitube unit with higher brightness.
How about major American TV makers? Well, at one
time or another, Zenith, Magnavox and Admiral have
worked on three -tube systems, but only Admiral seems to
be continuing its efforts and nothing is expected to come
of them until 1979 at the earliest.
Who else? GE for one. The company has long been a
leader in high -priced professional projection TV
equipment, and is expected to come into the consumer
market with a unique system priced under $2,000,
probably in 1978. And at the same time, Henry Kloss, who
founded and formerly headed Advent, plans to introduce
his own unique home projection design and offer it to
other manufacturers to build, rather than make and
market it himself.
DAVID LACHENBRUCH

www.americanradiohistory.com

CONTRIBUTING EDITOR

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514/748-8803
403/243 -0971

IF YOU WANT TO BRANCH OUT INTO THE TV TUNER REPAIR BUSINESS,

WRITE TO THE BLOOMINGTON HEADQUARTERS ABOUT A FRANCHISE.
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www.americanradiohistory.com

new se timely
Microprocessor controls tuner amplifier
Microprocessor technology has now
been incorporated in the latest entry in the
hi -fi /stereo field -the C3000, a tuner -amplifier produced by Barco Electronic of
Belgium.
Pushbuttons operate a scanner system
that pinpoints and locks onto desired frequencies with a high degree of accuracy.
The tuner uses a crystal oscillator to prevent drift. It scans and locks into the
correct radio -channel frequency. There is
an up -down mode that is used to automatically scan for optimum signal strength.
The microprocessor also allows up to 16
frequencies to be stored in memory, with
instant recall at the touch of a button. The
wavelength or frequency of the tuned channel is also shown digitally on the display
panel.
Other features of the C3000 include the
ability to zero in on stereo transmissions
only, a calculator -sized remote control unit
that controls 32 of the tuner's 48 functions,
pushbutton stereo balance control and a
convenient loudspeaker cutout.

General Electric receives Emmy for

VIR system
The television industry's highest honor,
the Emmy award, was recently awarded to
General Electric for its development of the
VIR (Vertical Internal Reference) system.

end of the broadcast spectrum -from studio to local station

determine whether
the color being received and rebroadcast is
the same as that certified at the broadcast
source.

-to

New FCC ruling eases private

sion Department.

John Cannon, president of the National

Academy of Television Arts and Sciences,
presented the award to Fred Weliner, genera! manager of GE's Television Department, who noted that VIR was a two -time
Emmy winner -the Electronic Industries
Association's Broadcast Television Systems Committee, which developed the VIR
signal, will also receive the only other engineering award this year.
The system, in essence, is a color -coded
reference that allows technicians at each

channel and the monitored channel, the

signals generated by these circuits are then
synchronized and the smaller picture is
superimposed on the main image.

telephone restrictions

It is not generally known but it has always

been possible to own your own phone and
not lease it from the telephone company.
However, very few individuals or small
business concerns have been able to take
advantage of this because the phone company has always charged a fee for special
"protection devices" that made it uneconomical for widespread usage.
Now, however, as a result of an FCC
order, everyone will be able to buy and
install his own phone without having to pay
a special fee. All that will be necessary is a

telephone company -supplied jack to hook

the equipment to the telephone network.
The telephone company is considering a
move that will enable them to profit from
this decision as well. They are contemplating selling telephones, which they formerly
only rented. "We're going to be competitive," asserts Charles Brown, president of
AT&T.

Additionally, it is expected that as more

customers install their own phones they will
find their monthly usage rates will rise. Up
until now, the telephone company has been
using equipment rental to subsidize basic
phone service, which is itself unprofitable.
However, in Rochester, NY, the independent Rochester Telephone Company has
already been selling company phones to its
customers, who then had their bills reduced somewhat in return. (So far, of the
company's 1800 customers, at least 1200
have taken advantage of the offer.) Officials
at the Rochester company feel that, even if
customers' monthly bills do go up it won't
be by much -they will only need to raise
their rates by 1% to offset any loss of
revenue from rental equipment.

Picture within a picture -a new

look in TV- viewing
EMMY AWARD for VIR system being presented
by TV industry's John Cannon (left) to Fred W.
Wollner (right), general manager of GE's Televi-

ing the main program. Two parallel electronic circuits are tuned to the viewing

Barco Electronic of Belgium has developed a new look in TV viewing that includes
three new viewing modes: a picture- withina- picture mode that allows you to monitor
another channel at the same time as your
main program, a program timer mode in
which you can program the TV to switch
channels at programmed times and jump
back and forth between channels. All three
modes are microprocessor -controlled.
The picture- within -a- picture mode is
based on a CCD (Charge - Coupled- Device)
system. The viewer presses the CCD mode
pushbutton plus the pushbutton for the
monitored channel. The monitored picture
appears in miniature form in the upper left hand corner of the screen, without disturb-

www.americanradiohistory.com

:,VijrPj
.

:a

t
n'

BARCO TV- VIEWING SYSTEM allows superimposition of second miniaturized picture in

upper left part of main picture for simultaneous

viewing.
In the program timer system, upcoming
program times and channels can be preset
to appear in the upper right -hand corner of
the screen. A pushbutton selects programs
for any time interval up to 9 hours, 59
minutes in advance. The TV set will then
switch to the selected channel after the
programmed time interval. This technique
can be applied to as many as four channels
at once.
The program jump mode lets the viewer
switch from the main program to another
channel every minute or half- minute. Several transmissions can be monitored using
this mode.

Direct -to -disc recording provides

clear, realistic sound
A novel direct -to -disc recording technique has been introduced by Audio -Technica U.S., Inc., manufacturers of hi -fi components, who have produced two records
under the Umbrella label.
The direct -to -disc process bypasses the
tape recording stages and many other signal- processing devices that are common in
most record -making. The end result is said
to be greater clarity, a more realistic "live"
sound and less surface noise.
The two Umbrella label recordings are a
single, Father & Son Sonatas, violin works
by Efrem Zimbalist, Sr., and Efrem Zimbalist, Jr.; the other is a two -record set entitled
Big Band Jazz, performed by Rob McConnell and the Boss Band. The records sell for
a suggested resale price of $14.95 and
$21.95, respectively.

"10 -4 day" is planned to honor CB's

good Samaritans
A desperately ill child, a devastating forest fire, a paralyzing snowstorm, an auto continued on page 12

BELONG TOGETHER!

Only SUCCESSFUL training programs combine them permanently.

Offer you successful learning and
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Intensive 3 days of high -key, person -toperson Forest Belt training methods
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Four WORKSHOPS to choose from:
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Hands -On CB Radio Repair
FM Two -Way Radio Servicing
Advanced Modern TV Repair

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Four SEMINAR Topics to date:

GROUP SELF -TRAINER KITS

Multimedia packages designed to be

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Workbooks that visually reinforce the
audio material, and then elaborate the
subject further. Workbook exercises add
practical understanding to each Module.
Each KIT has a Guide to assure
professional training sessions, even with
an inexperienced leader.
Available by July 1978.
Planned topics:
-Coping With Alignment in Modern TV
How CB Receivers Work (Basic)
-Single Sideband for CB, Ham, Marine
-Digital Technology in TV Servicing

-Tracking and Curing

Fore2f

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Learn to service Communications/CB

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l'i ew so

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mobile accident
these are just some of
the emergency situations in which CB operators have helped when all other communications have failed.
To honor CB's good Samaritans, the
Automotive Products Division of Motorola,
Inc., has started a campaign to have all 50
states declare the fourth day of the 10th
month (i.e., October 4) the official annual
"10 -4 day." (In CB lingo, 10 -4 means "I
understand. ") 10 -4 day is intended to focus
the spotlight on the importance of CB radio
operators in the nation's communication
system.
Motorola plans to contact newspapers,
magazines, and TV and radio stations and
provide them with information and editorial recommendations to help these media
plan their coverage.
.

U.S. Coast Guard to use CB radio

equipment

In an attempt to provide a greater measure of safety to owners of small craft

equipped with Citizens band radios, the
U.S. Coast Guard will install CB equipment
in all its Search and Rescue stations
throughout the country.
John Sodolski, vice president of the Electronics Industries Association and head of
EIA's communications division, hailed the
move as a step in the right direction to

continued from page

g 6

sion systems and to process human speech

for the purpose of improving the quality of
transmissions." The sound is analyzed by
dividing it into frequency and amplitude as
it is received -with as many as 200 million
operations -per- second. Because in the future, sound transmission will be increasingly in digital form, Bell technicians envision the processor being used as a tone signal detector. The computer hardware is
already compatible with existing phone
company switching offices.

New communications satellite

handles over 6000 calls

A new Intelsat IV -A communications satellite, developed by Hughes Aircraft of California, was launched by NASA in September, 1977. This latest addition to the evergrowing system of communications satellites will orbit over the Indian Ocean and
provide service to more than 40 countries.
It has been estimated that transoceanic
phone traffic expands at an annual rate of
about 15 %; last year the three Intelsat IV -A
satellites already operating in the Atlantic
Ocean area handled over 50 million calls.

provide better emergency communications

for thousands of recreational boaters who
have been using their CB's as a means of
communication.
Although it has not decided yet which
channel it will monitor, the Coast Guard
plans to have CB service available in time
for the 1978 boating season, adding, however, that the current communication and
distress system associated with VHF and
2182 kHz will continue to be the primary
system."

Sound synthesizer shows unique

talents
Hollywood movie executives were recently given a demonstration of Bell Laboratories' newest star -the telecommunication signal processor, or sound synthesizer.
Dr. H.G. Alles, a Bell Labs scientist, put the
machine through its paces.
The many-talented synthesizer uses a
computer -controlled digital process to
compose, orchestrate and perform musical
scores almost instantly in real time. It can
duplicate the sounds of both familiar musical instruments and some not yet invented! A ordinary keyboard, similar to that
of an organ, is pressure- sensitive -each
key has 100 different positions that are
computer -programmed to recognize all the
musical elements and control timbre, vibrato, tempo, etc.
Dr. Alles explained that the device is
used in the laboratory to analyze sound
and we will be using it to model transmis-

INTELSAT IV -A COMMUNICATIONS SATELLITE being tested prior to launch. Satellite can

handle 6000 transoceanic phone calls and two
TV programs.

To meet this expanding need, Intelsat IVA uses beam diversity (essentially the ability to transmit the same frequency band

twice) to relay more than 6000 simultaneous calls, in addition to two television
transmissions. Beam diversity makes it
possible to direct one communications
beam to one part of the world and the other
beam to another area. Because the two
beams are widely separated, they never
meet and cause interference, even when
the same frequency is used.
After a testing period, the new satellite
will take up its post off the east coast of

www.americanradiohistory.com

Africa and southwest of India; it will provide

service to more than 40 countries in the Far
East, Near East and Europe.

National Electronic Service

conference looks at the future
One of the highlights of the NESDA
conference held August, 1977, in Orlando,
Florida, was the Service Conference at
which present and future trends were discussed. Here are some of the conclusions
drawn from the five separate subject areas
covered:
1. Service requirements. Technicians
are better trained. With respect to TV,
products will be more reliable and use less
manpower. Other types of products may
need more manpower in the future. More
in -shop repairs, less field service. One crys"throw-away" TV!
tal -ball prediction
2. Types of test equipment needed.
Test equipment will be basically the same
but more sensitive. Good equipment is
presently available but there's a lack of
trained technicians. Average equipment investment for TV repair is projected at
$1500; for specialized audio service,
$5000. New IC's, etc., will make future
equipment easier to use. Equipment will
last for about five years before obsolescence.
3. Technical training. Industry loses
technicians as they become self-employed,
promoted or switch fields. Employers
should provide better working conditions,
fringe benefits, more factory training and
other incentives to retain them.
4. Effect of CB on industry. No effect on
wages. Not enough qualified or properly
licensed businesses. About 50% to 75% of
all CB repairs are owner -caused. There are
too many brands and unique parts. Equipment investment should be kept low due to
low cost of the instruments themselves.
5. Warranty legislation. The federal
Magnuson-Moss Law has not improved
conditions for servicer, dealer or manufacturer. State legislation lacks impact. Future
legislation will probably concentrate on
dealer business ethics, business practice
and the clarification of warranty terms.

-a

Power lines can cause "biological

effects"

In the latest phase of the ongoing controversy surrounding the proposed installation of some upstate power lines by the
New York State Power Authority, the
state's Public Service Commission recently
reported that the 765,000 -volt lines may
cause "biological effects in humans." Such
lines, however, the commission states,
could be operated safely if a wide protective zone were established under them.
The proposed protective zone will be 550
feet wide under the lines (more than twice
the authorized right -of -way granted the
Power Authority).
R -E

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editorial
Ma Bell

Radio-Electronics
Hugo Gernsback (1884 -1967) founder
M. Harvey Gernsback, KOD -6694
editor-in -chief and publisher
Larry Steckler, KTX -3644, CET, editor
Arthur Kleiman, KTZ -3288,
managing editor
Robert F. Scott, CET, W2PWG,
KXK -8533, technical editor
Sonia Greenbaum, copy editor
Jack Darr, CET service editor

... fair game

According to the U.S. Supreme Court, you now have the right to
buy and hook up your own telephone equipment. This does not
give you carte blanche; you still do have a set of FCC rules to
contend with: (They'll be out soon.)
The important point is that you will be able to hook up as many
phones and accessories as you wish, and not have to pay Ma Bell
anything for them. This opens the doors to Radio -Electronics
readers and writers to come up with some great projects
computer controlled systems, telephone call diverters, automatic
memory dialers, picturephones, and whatever else our inventive
readers can devise.

Leonard Feldman
contributing high -fidelity editor
Karl Savon, semiconductor editor
David Lachenbruch, contributing editor
Earl "Doc" Savage, K4SDS, hobby editor
Vincent P. Cicenia, production manager
Harriet I. Matysko, circulation director
Sheila Wertling, circulation assistant
Arline R. Bailey, advertising coordinator
Cover design by Louis G. Rubsamen
Cover photo by Michael Wilson

Radio Electronics is a member of the Institute of High Fidelity and is indexed in

Applied Science & Technology Index and
Readers Guide to Periodical Literature.

We are extremely interested in all those ideas. We want to and

will present them to our readers. If you've got a hot telephone
add -on, let us know about it. It could end up in the pages of the
next issue of Radio -Electronics.
A word of caution about the new rules. The phone company must
install the jacks. (In certain areas they are already raising the
price of installation; so if you want to get ahead, order those

extra jacks right away.) In some states (California, for instance,

seems to favor Pacific Bell) you may be required to get at least
one of your phones from the local phone company. If you do add
your own phones, they will have to be units that have been
registered with the FCC. However, there are already many
companies that have FCC approved phones.

Radio -Electronics magazine is published

by Gernsback Publications, Inc.
200 Park Ave. S., New York, NY 10003
(212) 777-6400
President: M. Harvey Gernsback
Vice President: Larry Steckler
Treasurer: Carol A. Gernsback
Secretary: Bertina Baer

ADVERTISING SALES
EAST
Stanley Levitan, KZA -5580
Radio -Electronics
200 Park Ave. South
New York, NY 10003
(212) 777-6400

I'd like your comments about this new ruling, suggestions for
articles that we should publish and manuscripts for those
articles.

Private telephone power. Long may it reign.

MIDWEST /Texas /Arkansas /Okla.

Ralph Bergen, KXD -8396
The Ralph Bergen Co.
6319 N. Central Ave.
Chicago, IL 60646
(312) 792 -3646

PACIFIC COAST

Mountain States

LARRY STECKLER

Editor

Jay Eisenberg, KYF -3277

J.E. Publishers Representative Co.,
8732 Sunset Blvd.,
4th Floor,
Los Angeles, CA 90069
(213) 659 -3810
Sales Mart Building
1485 Bayshore Blvd., Box 140
San Francisco, CA 94124
(415) 467 -0125

SOUTHEAST
J.E. Publishers Representative Co.,
214 -387 -2424

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AMERICAN VS. EUROPEAN TV'S

inside of the cabinet. have yet to find one

in an American TV. If you need one, you
either send to the manufacturer, Howard
Sams, or (if you're dumb and rich) to a
dealer who will try to get anywhere from $5
to $25 for a schematic.
4. If the TV has been repaired before,
there is usually a tag attached showing
what was replaced.
5. Every European TV worked on had a
circuit board that was mounted on a foldout, or fold -down, bracket that gave the
service man a very easy access to both
sides of the circuit board and all the test
points. In an American TV, to get at the test
points or to replace defective parts, you
have to remove screws, disconnect or cut
wires, and sometimes even make jumper
cords to test the board out of the cabinet.
6. Both tuners in European models are
easily accessible. Not so in American modI

would like to have my faith renewed! I've

always been told that America has the best
equipment in the world. Well, I've been
here in West Germany for 31/4 years. As a
hobby, I've taken up learning about and
fixing radios and TV's, both American and
European models. There are a few things
noticed that to me, as a novice, did not
seem right. Maybe you can tell me why?
1. The entrance to European TV's is
simpler -usually only two to four screws or
slip catches. American TV's have anywhere
from four to eight screws which are sometimes hard to get at, and the back piece
itself in some models is difficult to remove.
2. There are no line interlocks on European models -all American models have
them. Usually the owner has filed or bent
the prong ends to fit the wall receptacle.
The cord clips on the inside of the TV are
missing because the owner or repairman
bent it out of shape getting them off.
3. Just about every European TV has a
schematic diagram with voltage checks,
waveforms and parts list taped to the
I

els. Why?
7. Standardization of repair parts: Many
different models and makes had the same
type tubes, transistors, etc. It seems that
every American make and model has its
own specific parts, and a repair man would

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need a large truck or a big store to have

any reasonable amount of repair parts on
hand.
EDWARD M. KUBILUS
APO, NY
Efforts are being made by National Service Associations here to solve this problem. Unfortunately the American consumer
doesn't seem to care. He isn't worried
about your problems in fixing his set and he
doesn't seem to realize that it results in
higher repair costs. We'd like to get some
letters from other readers who would like to
comment on this problem. Especially from
servicers who are involved with organiza-

tions that are trying to solve the problem.

Tell us what's happening.- Editor

CORE MEMORIES
The article, "Core Memories -How They
Work," by Martin A. Sala (Radio- Electronics, September, 1977) does not properly
explain the operation of a core memory.
1. Once a core is magnetized, it cannot
be demagnetized, but its magnetic -field
polarity can be reversed. Whichever value
continued on page 18

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I64134
IN4142
I64144

2622220

SOCKETS

470mId50V

m 50V
60V

TRANSISTORS

4081
4511

m991

100mtd 50V
220074 50V

47mtn SOV

16151

C10601

none on SPST push button

DPOT slide
OPDT ownoncon

togge

Aluminum Electrolytic

101556V

80800

too&

PDT waD-on

CAPACITORS

L61340112178121 1M390061CA34011

280

SPOT [MO button

SPOT [WO button
SPST push button
SPST nv4, button

sta dip
SPST 8 sta 74.1
SPDT on -alt on

VDT on

LM320T9179051 1M7396
00320712179121 151741V
LM320T15179151LM147N
M14581/1555601
1M339N

DIODES

4000
4001

ASST

MICROPROCESSOR
I

7415109
7415123

741510

LM567V

SWITCHES
SPST

ASST 5
ASST 6
ASST 7

ASST]

1121092811

74LS83
741565
41586
41590

74744604

ASST
ASST

L556N

L613205-5119051 11/17236
105,80931

Low Power TTL Schottky

741500
41.502

RESISTORS

1M340T 15118151
LM5550

7400/7415 Data Book

CMOS /Linear Oala Book
M.croProcsssor /LEO Data Book

JI10411( Products only

A component product line developed for the independent dealer. Guaranteed, nationally advertised products. Complete
JIM -PAK program includes national advertising, direct mail programs, store display racks, stock rotation plan and return
policy. For dealer information, write or call JIM -PAK, 1021 Howard Avenue, San Carlos, CA 94070 (415) 592 -8097.

,t,t *** ** * ** ** * * ** *,r ****,r * *,r ** *,rte *,rit

SEE YOUR LOCAL
Lafayette Radio Electronics

Mobile

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Alberta (Calgary)
CONNECTICUT
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Zack Electronics
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The Radio Place

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J&H Outlet Store

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Byte Shop Computer Store
The Computer Shop

Computer World

FLORIDA

Altair Computer Center of Orlando

Tampa
Tampa

AMF Electronics
Microcomputer Systems

FRANCE
Paris

Computer Boutique

GEORGIA

Atlanta
HAWAII
Aiea

Honolulu
IDAHO
Idaho Falls

Atlanta Computer Mart

Delcoms Hawaii
Integrated Circuit Supply

Audiotronics

ILLINOIS
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Co.

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Spectronics Inc.

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East Chicago

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DEALER TODAY...

LOUISIANA

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J:i

Acro Electronics
Quantum Computer Works

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Computer Workshop of Baltimore
Everything Electronics
Computer Workshop

Baltimore
Baltimore
Rockville

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Computers, Etc.

Tufts Electronics
Electronics Service Center
Computer Mart Inc.

MICHIGAN
Fulton Radio Supply

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MINNESOTA
Duluth

Northwest Radio of Duluth

Dacom Amateur Radio Center

Eagan

MISSOURI
Park ville

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MONTANA
Billings
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Las Vegas
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Raleigh

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Bucyrus
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Byte Shop of Raleigh

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Guymon
Oklahoma City
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Beaverton
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Sound Service
Bits, Byres & Micros

Altair Computer Center

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Hershey

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Microcomputer Systems Inc.

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of Pittsburgh

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Technical Services Inc.
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Memphis
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Computer Shops Inc.
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Interactive Computers
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Computer Hardware Store

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Spokane
WEST VIRGINIA

Morgantown
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Progress Electronics
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Personal Computers
The Computer Corner
Electro Distributing Co.

LETTERS

continued from page

Presenting
your
portable
automatic
solid state

of current it took to initially saturate a core

into a magnetized state, it takes at least 3/4
of the value of that current in the opposite
direction to have the core's magnetic field
reverse polarity. It will take at least 3/G of
that value in the original direction to switch
it back. This procedure is usually represented graphically by the hysteresis loop.
2. Either polarity of a core's magnetic
field is arbitrarily chosen to represent a
logic 1; the other polarity, a logic O.
3. Logic 0's are not written. A core is a
logic 0, if a 1 has not been written in it.
4. Core memories are fast compared
with discs, tapes, etc., but they are slow
compared with other solid -state memories.
5. A logic 1, for TTL, is normally 3.3
volts, while a logic 0 is normally 0.2 volts.
DENIS AUBRY
Montreal, Canada

GAI

"

TF46 PORTABLE

SUPER CRICKET
TRANSISTOR

&

16

FET TESTER

TV -TO- STEREO RECEIVER

ADAPTER

HOPPER"

am a college student who is majoring in

broadcasting and communications /journalism. like to dabble in electronics, and
have been able to solve and correct some
problems with my home studio equipment.
I'd like to suggest that your magazine
develop and print the following project,
along with circuit illustrated photos showing parts locations as well as easy -to- follow
diagrams:
My suggestion is a TV -to- stereo receiver
adapter so that home viewers can listen to
their favorite TV programs in a pseudo stereo sound (matrix), and if the particular
program audio is worth recording, one
have
could easily do it. One problem
encountered with a commercial device is
hum that is picked up and audible over the
receiver speakers, as well as on tape if a
recording is made.
presume this problem is because of the
tubes in the TV sets. You can probably
figure out a way to avoid this problem, and
think that a lot of people who would like to
add a new dimension to their TV viewing
would find this a program brightener, especially during reruns and new Fall offerings.
ROBERT E. THOMAS Il
Bridgeport, CT
I

Now, nobody likes to be called a Job Hopper, but the new, patented TF46 Portable Super
Cricket can literally help you hop from job to job through solid state circuits faster than
any other transistor tester on the market today. For the first time you can automatically
analyze 162,000 different transistors and FETs, in or out of circuit at any job location in
the world. Here are four reasons why.

It's 100% automatic.

Connect the test leads any way you want right in circuit and rotate the large
permutator knob until the Cricket "chirps ". Read any transistor or FET as
Good or Bad on the meter with the patented phase- inversion automatic Cricket
test. It even identifies the transistor leads! It virtually thinks for you.

It takes no set -up information.

None at all. It tests over 162,000 transistors and FETs with the same, simple
test, and can easily be used by a non -technical maintenance person.

LfANAGE

The only portable tester that includes transistor Beta, F ET Gm, and full leakage checks to totally check all parameters, and catch troubles other miss.

You can now test solid state circuits anywhere.

The TF46 is fully battery operated for the field, or AC operated for the bench
with the optional 39G90 Power Adapter. You know what else? The TF46

automatically turns itself off after

10 minutes of testing in the

field to save

the batteries.

All these features, at $45 less than the earlier model TF30 Super Cricket that was ACoperated only. Hop to it. Call your local Sencore Full Line Promotional Distributor,
or order your TF46 Job Hopper with the coupon below.

-tip
El

- - - - -- =- to -- -- --- - - - - --

NCOFR

WANT TO BUY IT.

to me at $195 each.
Check /MO enclosed.

E1

Send_TF46s
Send C.O.D.

Also send:
PA202 Power Adapter

NAME:
COMPANY:
STREET:

SEND FULL SPECIFICATIONS.

18

3200 Sencore Drive, Sioux Falls,

So. Oak. 57107 1605) 339 -0100
In Canada: Superior Electronics

$9.95

$10.00
39G85 Touch -Test Probe
IT. Have my nearest
I WANT TO TRY
Sencore distributor bring the TF46 to me.

CITY:
STATE:

provides Leakage & Gain tests

to completely analyze any transistor or FET.
It

GAIN

ZIP

PHONE:

CIRCLE 26 ON FREE INFORMATION CARD

www.americanradiohistory.com

0000PS!
There is an error in the parts list
for the Biorhythm Clock (Nov.,
1977 issue). The ordering information for the parts kit is inaccurate. Kit BC -P ($29.95) is NOT
a complete kit of parts. It does
not include the PC boards (Kit
BC -PCB), the custom -made
cabinet (Kit BC -C) or the optional IC sockets (Kit BC -S). For a
complete package, you must order Kit BC -P, PLUS Kits BCPCB, BC -C and, if you desire,
BC -S.
The editorial staff of Radio Electronics Magazine sincerely
apologizes for any inconvenience you may have experienced as a result of this error.

INTRODUCING... TWO- CHANNEL ANALOG DELAY UNIT

FOR AMBIENCE SYNTHESIS AND DELAY EFFECTS
*TWO INDEPENDENT CHANNELS

* 3072 STAGES

OF

DELAY PER

CHANNEL

* ADJUSTABLE INPUT AND OUTPUT

LEVELS WITH INPUT OVERLOAD
INDICATION

EXTERNAL VOLTAGE CONTROLLED DELAY TIME

* INTERNAL

dimensional. Without the mixture of direct and delayed sounds that a large hall
provides, almost all music reproduced in
the home is lifeless. Quadraphonics has
not proved to be the solution to this
problem. The recent developement of
bucket -brigade semiconductor technology has made it possible to offer a reasonably priced delay unit that can transform your listening room into a concert hall. Using your present stereo
system, the 2AS -A, and whatever you
have in the way of 2 additional speakers
and 2 channels of power amplification
you have all the parts to put together an
ambience system that is capable of creating the kind of 'space' you enjoy music
in. You don't need state -of- the -art componentry to enjoy an ambience system.
The secondary power amplifiers and
speakers can be of very modest perfor2

FEATURES

OR

* COMPANDOR

IN EACH CHANNEL

*3

MODES /CHANNEL WITH ADJUSTABLE MIX

* CONVENTIONAL REVERB OUTPUT

FOR MUSIC EFFECTS

If you haven't heard what analog

delay can do for home music reproduction, you're missing something. Let's face
it, stereo in your living room is flat and

and yet still serve to create

strikingly realistic spaciousness in your
listening room. If you don't have 2 extra
power amp channels on hand, we offer
several low cost, low power amps in kit
form that would be ideal for this pur-

mance

pose.
signed

Although the 2AS -A has been defor use in music reproduction

systems as an ambience synthesizer, its

voltage controlled clock and mixing capabilities allow it to be configured in a
number of ways for delay effects such as
phasing, flaging, chorous, and vibrato. External voltage control for special effects
must be user supplied.
The 2AS -A is sold in kit form only
and includes the circuit boards, components, chassis (111/2" x 10" x 4"),
cover 120VAC power supply, assembly
instructions and application notes.

MAIL THIS COUPON TODAY

2AS -A Analog Delay Unit

$250.00 ppd. Cont. U.S.

Enclosed

is

or BAC /

or Master Charge #

Bank

Expire Date

NAME

Southwest Technical
Products Corp.

ADDRESS
CITY

219 W. Rhapsody, San Antonio, Texas 78216

London: Southwest Technical Products Co., Ltd.

TOkyO:southwest Technical Products Corp. /Japan
CIRCLE

L
7 ON FREE

ZIP
STATE
SOUTHWEST TECHNICAL PRODUCTS CORPORATION
San Antonio, Texas 78284
Box 32040,
INFORMATION CARD

www.americanradiohistory.com

equipment report.
Simpson model 461 Digital
Multimeter

There are six resistance ranges, the lowest

range is 200 ohms, with only a 200 -mV applied
voltage. All the other resistance ranges use 2.0
volts.The top range is 20 megohms.
The model 461 has an accuracy of 0.25% on
the DC voltage ranges. The meter also has
automatic zeroing and automatic polarity indication. You can take readings down to a resolution of 100 AV, 0.1 ohm, or 100 nA on AC or
DC. The resistance readings are accurate to
0.5 %, except on the 20- megohm range, which
is 1.0%.

The controls are pushbuttons and are spaced

widely enough so that there is no problem
hitting too many at once. The test leads are
recessed and they plug into the right -hand side
of the case. The test leads are completely insulated and the test probes are corrugated so
that you can hold them more easily; there's
also a safety ring to prevent your fingers
from sliding too far and getting into trouble.
The tips of the probes have sharp points for
digging into PC boards, and screw -on
insulated alligator clips can be used for
hands -off testing.
The DC ranges are overload protected to
1100 volts on all ranges; the AC ranges are

CIRCLE 97 ON FREE INFORMATION CARD

SIMPSON ELECTRIC COMPANY, 853 DUNDEE AVE.,

Elgin IL 60120 have developed a new, compact

3'/2 -digit digital multimeter, the model 461.
The readout uses 7- segment 0.3- inches high
bright LED's. Despite its small size (it's only
5.5 inches wide, 2 inches high, 4.5 inches deep)
it has all the "goodies ": A 10- megohm input
impedance and a total of 26 ranges. It reads
DC volts from 200 mV up to 1.0 kV; AC volts
from 200 mV to 600 volts RMS; and reads
both AC and DC current, from 200 A up to
2.0 amperes in five ranges.

IN ELECTRONICS
DIP /IC

:k

INSERTION TOOL

STRAIGHTEN PINS
* MINIMUM

$25.00. SHIPPING

CHARGE

HAS THE LINE...

PIN STRAIGHTENER

PICK- UP

RELEASE
ORDER

WITH

protected up to 650 volts RMS. The resistance

ranges are protected to 135 volts RMS on the
two lowest ranges, and to 250 volts RMS on
the higher ranges. A fuse located in the battery
compartment protects both AC and DC current ranges to 2.0 amperes.
The model 461 uses LSI (Large Scale Integration) technology. The A/D converter and
most of the circuitry are contained in a single
large IC. Only the signal -conditioning circuits
(the shunts, multipliers, etc.), are external.
Power for the circuitry is provided by four
rechargeable NiCad batteries. The charger
plugs into a socket on the left side of the case.
The Simpson model 00475 battery charger,
120 V input, comes with the instrument. The
model 00746, a 230 -volt input charger, is also
available. Fully charged batteries provide at
least 8 hours of continuous operation, and can
be recharged overnight.
The readout of the model 461 is quite stable.
It will lock in less than 1 second, and the
display is updated three times-per- second.
There is no hunting to speak of. The least
significant digit (on the right -hand side of the
readout) may rock back and forth digit, but
continued on page 30

INSERT

$1.00, N.Y. CITY AND STATE RESIDENTS ADD TAX

OK MACHINE AND TOOL CORPORATION

3455 CONNER STREET, BRONX. NEW YORK. N.Y 10475 U.S.A.
PHONE (212) 994 -6600 TELEX NO. 125091

CIRCLE

ON FREE INFORMATION CARD

www.americanradiohistory.com

Up -date your hi-fi setup with this frequ -nc

and time display that can be an add -on accessory
or built into a modified AM/FM set.
Construction is simple and inexpensive.

THERE'S NO DENYING IT, DIGITAL READ -

outs are definitely a status item these

days. And what's more they are practical,
offering easy no- squint readings. The
home stereo receiver is a natural for a
digital readout, but only a few offer this
feature. But now you can add a digital
readout to your receiver at low cost, and
get such advantages as no squinting at a
dimly lit dial, or guessing at frequency.
Imagine! You listen to a station on 101.3
MHz FM, so you tune to 101.3 on the big
'/2 -inch display and there's your station!
And as a bonus, you get a clock function.
Wouldn't this project look good on top of
your stereo receiver? Or how would you
like to build it inside like we did on the
Sansui receiver pictured?
This clock /frequency display unit is
made possible by a couple of new IC's.
You can read the time in hours and minutes, then either the AM or FM radio
frequency, depending on what band the
radio is set to. And for best accuracy, this
project is crystal controlled.
The entire clock /display section is on a
single IC! Only a few other IC's are
necessary for interfacing. This really simplifies construction. Also, PC artwork
and a kit of parts are available. The whole
unit is simple, neat and easy to connect to

the radio. How about connecting it to one

of those manufacturers' close -out AMFM receivers that are sold without dial or
cabinet. They are available from time
to time for $30 -35 from Poly Paks,
Olson Electronics and other mail -order
houses.
There are two state-of- the -art IC's in
this project that may not be available to
the hobbyist just yet. To make things
easier for you, we are offering a kit of
parts. If you prefer, you can order just the
parts you need and make your own PC
boards from the patterns shown in this
article.
The time -frequency display can be
built into the rEceiver or made as an addon accessory with readout and controls in
a separate case. In addition to the add -on
version, I have built displays inside two
Sansui model
commercial receivers
331 I bought for $100 and then modified,
and a $29.95 "dial -less wonder."

-a

How it works
This project is based on a single IC.
This device-the AY3 -81 12 from General Instruments -is, to my knowledge, the
first of its kind. It has inputs to control
the time and frequency functions and is
easy to work with.

GARY MCCLELLAN

Figure
is a block diagram of the
digital clock /frequency display. Construction is in two sections. The first is
the radio interface module (Fig. 2) that
processes the radio's local oscillator signals. It must mount inside the radio and
as close as possible to the oscillator to
minimize detuning and stray radiation
that can cause interference in the receiver. The interface accepts the FM local
oscillator signal and divides it by 100. To
develop the proper signal for the AM
radio frequency display, the interface has
a Schmitt trigger that simply squares the
AM local oscillator signal. A 5 -volt regulated supply provides the operating voltage for this board. The FM oscillator
signal is divided down by ICI, a VHF
prescaler; IC2 is a quad 2-input NAND
gate wired as a Schmitt trigger to square
the AM oscillator signal and IC3 is the
voltage regulator.
The second section or module (Fig. 3)
houses the clock /counter IC. Basically,
this IC contains three 31/2 -digit counters,
any one of which can be displayed by
energizing certain pins. One counter, set
to divide by 6, is the clock. It runs as long
as power is applied and is independent of
the others. The next counter is the AM
frequency display. It reads the radio's
1

21

www.americanradiohistory.com

MAIN MODULE

MAIN BOARD
RADIO

FM OSC

.11

1=1 1-1

100

ICI

L
AM OSC

local oscillator frequency and subtracts

the intermediate frequency (IF) from it.
The resultant display is the true radio
frequency that the tuner is tuned to.

ll'
000.L.1

INTERFACE
MODULE

1-

01

&IC2

SCHMITT
TRIGGER

AC
+9

12V

NI

POWER

SUPPLY

6.3 VAC

FROM RADIO
POWER TRANS

FM

RECT

CFM

AM

01

AM

_ = loos

AM

(CVCK

NF

6CLOCK
S3-

NOTE: S3 MAYBE MODE SWITCH IN RADIO

1 -BLOCK DIAGRAM of the time /frequency display. The interface module processes the oscillator frequencies before they go to counter /clock IC4.

FIG.

RADIO

CABLE

5V REG IN
TO FM

LC5

012

FROM

Doc
RIT

Cl

1"n

5pF

SIGNAL
PROCESSOR

2.1NF
2

FM

ICI
DS

C3

.01T

SIGNAL
5

8629N
3

14

OUT

R2

C6

470

OUT

SHIELD!

R7

15K
R5

680:2
R4

330f2

OUT

L_

-1

TO AM/FM

SWITCHING
IN

IS3-e)

0.1uF

2- CIRCUIT OF THE INTERFACE module. FM

5V REG

SW

C9

FIG.

MPF-102

MEG

SIGNAL

al

AM

R3

PROCESSOR

11

12
3

IC2

SIGNAL

7400

10
R6

.001

TO AM
3
4

C8

5V REG IN

AM

.1

10K

47pF

T01

C7

SHIELD

C4

-L-I
AM

!Y/

LN I340T-5V

+'
9-12V

IN

-J

signal is divided by 100; AM signal Is squared by

If this sounds confusing, remember

that all superheterodyne receivers mix
the incoming signal with the frequency
developed by the local oscillator. The
difference signal (the intermediate frequency or IF) is amplified and then rectified by the detector to recover the audio
signal. The local oscillator frequency
must be equal to the signal frequency
plus the IF. Putting it another way, the
frequency that the radio is tuned to
equals the oscillator frequency minus the
IF. This explains why the IF must be
subtracted from the oscillator frequency
before the resultant is displayed on the
digital readout. One of the counters in
IC4 is internally programmed to subtract
455 kHz when in the AM mode.
The last counter handles the FM signal. It operates exactly as the AM counter does, but the intermediate frequency
that it must subtract is not preprogrammed. The number to be subtracted
is programmable externally by diodes Dl
and D2. This counter takes the divided down FM signal from the interface
board, counts it and then subtracts the IF.
The difference is shown on the LED
display. The remaining parts on the main
board include the main power supply, a
crystal timebase and some display driver
components.
Selecting a receiver
The most challenging part of this project is adapting your receiver to the
clock /frequency display. Choose a receiver you can work with that has the following features:

the Schmitt trigger.

PARTS LIST
For interface, display and main boards
All resistors are '/. -watt, 5% film, unless

otherwise noted.

-100 ohms
R2, R12- 10,000 ohms
R1

-1

R3
megohm
R4 -330 ohms
R5 -680 ohms
R6 -470 ohms

R8-

R10- 100,000 ohms

-15

R11
megohms
R13 -R20 -2,200 ohms
R21 -R24 -3,900 ohms
R25 -R32 -150 ohms
C1
pF mica
C2 -C4, C13 -.01 F disc
C5, C7 -0.1 F, 10 -volt disc
pF mica
C6

-5

-47

C8, C12 -.001 F disc

C9 -0.1 F, 25 -volt disc or Mylar
C10 -10 pF mica
C11 -22 pF mica
C14, C15 -.05 F Mylar
C16 -1000 F, 16 -volt PC mount

electrolytic

D1, D2- 1N4148 diodes

RECT1
PIV, 1 A miniature bridge

-50

rectifier (Radio Shack 276-1151 or

equal)
F1

-1/2 A fuse and chassis holder

ICI- DS -8629N VHF prescaler (National)

IC2- SN7400N quad 2 -input NAND gate

LC3- LM340T-5 5 -volt regulator
(National)

IC4 -AY -3 -8112 clock /counter (General

Instrument)

IC5 -CA -3081 display array (RCA)

Q1- MPF102 FET (Motorola)
Q2- 2N2222 silicon NPN or similar
2N3905 silicon PNP or similar
Q3DIS1- DIS4 -FND -510 common -anode 7-

06-

segment display (Fairchild)

LED1- LED3 -NSL -5053 lamps (National)
or equal
S1 -S2 -SPST normally open pushbutton
switches
T1 -6.3 volt, 600 mA filament transformer
XTAL1 -2.304 MHz AT -cut crystal, 20 pF
parallel capacitance HC6 /U, wire leads
Miscellaneous: Interface board (model
80A), display board (model 81B), main
board (model 81C) and type 772 LMB
box.
All parts listed above are available as
the model 81 kit for $44.95 postpaid
from Gary McClellan and Co., PO Box

www.americanradiohistory.com

2085, 1001 W. Imperial Highway, La

Habra, CA 90631. Also available are the
three PC boards, etched and drilled (Kit
No. 81 -1) for $6.50 postpaid and Kit 812, consisting of all IC's, for $34.95

postpaid. California residents add state

and local sales tax as applicable.

Additional parts for built -in version

C17- C18 -.05 F Mylar (if needed, see
text)
C19 -1000 F, 16 volt PC mount

electrolytic
D3,

D4- 1N4148

D5-1N4002

RECT2 -50 PIV, 1 A bridge rectifier

(Radio Shack 276-1151 or equal)
RY1 -SPDT relay, 12 VDC (Radio Shack
275 -003 or equal)
Q7- Q10- 2N2222 silicon NPN or similar
R33- 10,000 ohms
R34 -R36- 47,000 ohms
Miscellaneous: Type 007 -746 LMB box to
house the display, 3 -inch square of

perforated circuit board.

Additional parts for the add -on version

-3

-pole, 3- position rotary switch with

knob, 463N LMB case for display, 9 -pin
plug and socket (J1 and PLI)

S3

AM/FM
FREQ

TO S3

AM FREQ.

28

OR SWITCHING
IN FIGS4&5

FM FREQ.

27

VCC
SET TIME

AM /FM

26

SET FREQ.

INHIBIT TIME SET

25

INTENSITY

TEST

24

SEGMENT E

RESET

23

SEGMENT A

22

SEGMENT B

21

TIME

TIME SET

i9V

OSCILLATOR 1
OSCILLATOR 2
FM /IF ADJUST
DIGIT 2
DIGIT 3

oo-

Si

HRS

O
82

MI NS

20

SEGMENT F
SEGMENT DP

10

19

SEGMENT C

11

18

SEGMENT G

Cii

DIGIT4

12

17

SEGMENT

10

22

DIGIT

13

16

SET MINUTES

14

15

SET HOURS

ONO

Rl3 -RI9
ALL 2.2K

2.304
MHz

2R25

'11111ra

R77

/1lSr
23 22

16

19 17 21

18

IC4

AY3-8112

24 2.2K

R27

A
8

1/1Ar$

CA308
4

R31

OP

I15

AU

R32
15052

12

FIG. 4 -FOIL PATTERN for the interface board

shown full size.

002

DISPLAY
BOARD

2N2222
28 4

HR29
R30

Cr

20

R26

12
1

10

R19

15 MEG

IC5

W1r13

R18

611

R25-R31 ALL 150SZ

NN1R15...
11
R14

XTAL

27 15

C10

R13

26

AY3-8112

13

MSD (0154)

R21
Q3

2N3905
1N4148

TSO (3153)

R22
Q

3.9K

TS0 (0152)

2N3905
R23

02
R10

R12
10K

100K

1N4148

06

19K

LSD (0151)

2N3905

FM SIGNAL

FI

REGT

PLI

AC
C14

SIGNAL

C16

.05T

o6.3V
AM

1000F
16V

600mA

AC

FROM

INTERFACE

C15
.05

3-

FIG.
DISPLAY AND MAIN BOARD WIRING. Most of the parts are on the main board. Display board
has three LED's and four seven-segment display devices.

must be a solid -state model.

Tube-type sets offer a shock hazard and high voltages that can
damage the interface board.
Select a set with ample room
around the tuning capacitor. The

short! Install all capacitors except CI and

C6. They connect between the radio and
the interface board and will be installed
later.
Install the IC's. You may have to
enlarge the holes a bit to accommodate
the leads of IC3. Install Q1, a MPF102,
in the space provided. Attach a small heat
sink to the tab of IC3. You can make one
from a 3/4- by 21/2 -inch piece of scrap
aluminum shaped as shown in the photograph.
Complete this phase of the construction by connecting the leads to the input
and output terminals on the board. Use
/A- inch -diameter shielded cable for the
two output leads and regular hookup wire
for the rest of the wiring. These leads can
be up to 3 -feet long. (Be sure that the
output leads are shielded; otherwise you'll
get radio interference.) I used type RG174/U coax in my installations.
'

It

interface module must be

mounted very close to this capacitor and will require the extra
room. Avoid compactly built sets.
Also, if you want to build everything into the receiver as I did on
several models, you'll need room
around the existing dial for the
display section.
Know your receiver, or at least
know how to locate its AM and FM
oscillators. Once you know what
to look for, tapping into the oscillators is easy. A schematic of the
set will be a great help.
And finally, your set must have
455 -kHz AM and 10.7-MHz FM
IF's. This shouldn't be a problem
because these IF's are worldwide
standards.

Construction
This project is built on three PC

TOFM
osc

ONO

TO SW ON MAIN HOARD
TO FM ON MAIN
TO AM ON MAIN BOARD

TOAM_
OSC

C7

1I
C6

FIG.

5- COMPONENT PLACEMENT

layout for the interface board. It is shielded and mounted very

close to the radio's local oscillators.

boards. You can purchase them or construct your own from the foil patterns
presented here. Start construction with
the interface board (Fig. 4). (If you buy
the boards and the interface board foil is

tarnished, polish it with silver cleaner.)

This board comes silver plated.
Begin construction by installing the
two jumpers as shown in Fig. 5. Note that
one is just below IC I and the other starts
at a point under IC2 and extends under
R7. Add the resistors. Keep all leads

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Now, let's tackle the display board

(Fig. 6). Install the 13 wire jumpers as in
Fig. 7 -a. Be sure you get them all and that
they are properly installed because the
LED's cover most of them. Double -check
your work and then install displays DISI
through DIS4. Note that the ribbed ends
point up on the display board -toward
the F- segment foil on the reverse side.
Install LEDI and LED2 in the center
of the display to form the colon. Note
how the LED's flat sides are oriented

AF

08 9

CO
OE

Fig. 7 -b. Finish up by installing

the FM decimal point, LED3. A place,
marked ST, has been provided for a
stereo indicator LED. Use it if you
wish to remote the radio's existing stereo
indicator for a more professional looking
display.
in

1101,04;011011

oY1O1Oa211

44q1

1c"3!i

ST
O

6- DISPLAY

BOARD FOIL PATTERN. Terminals just above "ST" are for optional LED stereo
indicator, shown full size.
FIG.

1177-'1
a

LED2

INDEXING
RIDGES

LEDI

1E03

R29
R25
R26
R30

'

R28
R27

R32

``

R3I
-2 -3 -4 JUMPERED TO NUMBERED TERMINALS ON MAINBOARD
b

FIG.

7- DISPLAY BOARD component placements. Positions of the thirteen jumpers are shown

readout components are positioned as at b.

,o

fm
swPLIIf

ac

00

da

in

oP2oo

VIEW OF A PARTIALLY CONSTRUCTED MAIN

BOARD. Note that R13, R14 and R17 are
installed between the rows o' pins used as the
socket for IC4.

48p

IbmhSg

dP

8B

AP

at a;

FIG. 8 -FOIL PATTERN for the main PC board. The holes in the top right and left corners match
similar ones in the display board and are used to join the two boards together, shown full size.

--, _l.
J1,

DISPLAY BOARD

r rr'ir+ ,.,y

li'ia/IUIr
R16
R18

J1, PIN

TO S3

1 -2.3-4
JUMPERED
TO SAME
NUMBERS ON

TO St
& S2

PIN

"

`"-,
i41,+

R15

NOTE:

TO Ti
REST

'

CLOSE -UP OF THE COMPLETED BOARD as it

appears when installed in the case. Compare
this view with that in the photo above.
TO S3

INSULATED JUMPER AND R13, R14 & R17

ARE UNDER 1C4. Dl -02 AND RB -R10 ARE
ON FOIL SIDE OF BOARD.
INSULATED JUMPER
FOR CONNECTIONS a -g AND dp ON ICO,
SEE FIG. 3.

FIG. 9 -HOW COMPONENTS ARE PLACED on the main board. Note insulated jumper running under
IC4.

24

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Build the main board as in Figs. 8 and

jamper and then
the two insulated jumpers. Add two rows
of 14 Molex pins to form the socket for
IC4. Do not break off the tabs until you
are ready to install 1C4 as the final step
continued on page 74
9. Install the bare -wire

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Keyboard: The keyboard consists of 40 keys and 2
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Advanced Electronics

Should your
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than one -fourth of all electronic equipment manufactured today. Nearly twice
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EQUIPMENT REPORTS
continued from page 20
this rocking usually occurs at 0.1 volt and can
be ignored.
Our sample unit came in an impressive
leather -like carrying case, model 00747. The
case has a flap pocket to hold the meter. An
'adjustable neck -strap is used. The top flap of
the case can be turned back and snapped down
so that you can carry the instrument around
your neck. Holes in the side of the case allow
the test leads to be plugged in. A neat pocket
on the bottom of the case holds the test leads,
and even the battery charger can be carried in
its own little pouch, which hangs on the neck
strap. A flip-up stand has rubber feet so that
you can set the model 461 at the right viewing

angle for bench work. Since there are no

connections on the back, the meter can also be
set in the vertical position.
The model 461 is reasonably priced at
$142.95, complete with test leads, battery
charger and NiCad batteries. The human engineering of the controls, readout, etc., is excellent and makes the model 461 a useful and
highly accurate piece of test equipment. R -E

Triplett Model 64 FETVOM

THE THIRD OF THE 60-SERIES TRIPLETT VOM'S
is the model 64 FETVOM.
Like the others, this, too is contained in a

green drop-proof high -impact plastic case. The

model 64 has a high -impedance input of 11.12

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CIRCLE 8 ON FREE INFORMATION CARD

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CIRCLE 96 ON FREE INFORMATION CARD

megohms in all ranges. It can be used in electrical work, industry and schools; and is particularly applicable in solid -state electronics; radio, TV, CB, and so on. It reads DC voltages
up to 1000 volts, with the lowest scale from 0to 300 -mV full scale; eight ranges give flexibility; and the AC voltage ranges are frequencycompensated (except for the 300- and 1000volt ranges), reading from 20 Hz to 20 kHz. A
dB scale is provided on the meter, with a chart
showing the range. 0 dB is 1 mW across 600
ohms, or 0.775 VAC.
A single switch selects all voltage and resistance ranges. The function switch on the left
side of the panel selects the AC or DC volts.
The polarity switch on the right reverses the
polarity of DC voltages. This switch also
reverses the polarity of test leads in the
ohmmeter function for transistor testing. The
seven ohms ranges are all (except for the X lmegohm range) low-power ohms, which apply
only 90 mV across the device under test. In the
X 1- megohm range, only 0.9 volt is used.
A special junction -test function has its own
scale at the bottom of the meter scales. When
connected across a good junction of a transistor, diode or IC, the meter shows infinity in
one position of the polarity switch; and in the
other (forward -biased) position, it reads open,
short, germanium or silicon, for both testing
and identification. Any significant reading in
the infinity direction shows that there is
leakage across the junction.
The very first FETVOM's were delicate
little things. The model 64 is specially designed for ruggedness and for electrical safety as
well. It has all the regular VOM features, such
as recessed test -lead jacks, no exposed metal on
the case and so on. It is well -protected electrically, too. Quite a few protective devices are
used: a -amp fuse in the common lead; protective diodes across the meter itself; a neon lamp
shunted across the FET input; an arc gap for
good measure; and the same 2-amp 1000 -volt
fuse to protect the meter against explosive arcs
that could not only damage the instrument but
also the user. All ranges are guaranteed to
withstand up to 1000 volts AC for 30
seconds.
Calibration instructions are given in the
manual. Only one is needed for DC, which is
set for full scale on a 1.0 -volt input on the 0-1volt range. AC voltages have two, one for calibration on the 3 -VAC range, and another for
compensation on the 30 -V AC range.
A high -voltage probe will raise the upper
range of the meter to 30 kV DC. The case
handle doubles as a bench rest to hold the
instrument at any desired angle.
This nice, useful piece of test equipment is
built for long service, and is available from
Triplett Corp., Bluffton, OH 45817. The modR -E
el 64 sells for $136.00.
1

used this circuit in their model CB42 CB

Analyzer.
Now, this company is marketing this circuit
as the model CB44 27-MHz scope frequency
converter.
The model CB44 has a built -in dummy load

Sencore model CB44 27MHz scope frequency

rated at 12 watts P-P and at 4 watts average

power. A cable and a PL259 plug allow you to
connect it to any CB transmitter. The scope is
connected to handy terminals on the other end
of the unit. What it does is to beat the 27 -MHz
CB carrier against an oscillator running at
26.865 MHz, resulting in a beat frequency
that will be within a 200 to 800-kHz range on
CB Channels to 40.
It uses a novel circuit for doing this. The
oscillator is a FET with a bipolar buffer. The
operating power for the circuit is provided by
the CB transmitter's RF carrier. This is rectified, filtered and regulated to run the oscillator
on any signal with 1.0 watt of RF power or
more. No external power supply at all is necessary.
The output terminals used are unique and
very handy. Each one is just a little loop of bare
wire on an insulated board. There are three
terminals: a scope output, a common and a
low- impedance output straight from the RF
carrier for use with a frequency counter. Just
clip the scope and counter leads to the loops
and away you go. Modulation and frequency
can be read simultaneously.
A little plastic overlay is included that you
attach to the screen of any 3- or 5 -inch scope.
This is calibrated for an exact reading of the
modulation percentage. You set the unmodulated RF carrier level to just fill the space
between the two zero marks; and from then on
everything is easy. Positive and negative modu-

converter

CIRCLE 98 ON FREE INFORMATION CARD

IT MAKES IT MUCH EASIER TO FIND PROBLEMS

when you can actually look at the modulated

RF carrier of a CB transmitter. Under- and
over -modulation, clipping, nonlinearity and
many other problems can be identified. Until
recently, you needed a 30 -MHz scope to do
this. A circuit has been developed that lets you
observe the modulated carrier on any scope
with at least a 1.0 -MHz bandwidth. Sencore
(3200 Sencore Dr., Sioux Falls, SD 57107) has

COMPUTERS
Next month's issue of Radio Electronics will contain a roundup of microcomputer mainframes. It will feature the most
popular ones. So, if you're looking to purchase one, or even if
you already own one and are
interested in knowing what the

latest equipment looks like,

don't miss the February issue of
Radio-Electronics.

520

ABO

lation percentage can be read directly. For best

results, the test signal should be a good -kHz
sinewave. Overmodulation, clipping and non linearity can be seen. Modulation limiters in
the transmitters may be checked out. SSB
transmitters can be checked in the same way.
You can use either the SSB double- frequency
test tone or a single- frequency l -kHz sine wave. The instruction manual contains typical
scope patterns showing correct modulation and
several possible faults.
If you happen to like the old original trapezoid pattern for the modulation tests, you can
do it. Just feed the scope from the model CB44
vertical scope output and connect the scope
horizontal input (set it to external horizontal
sweep) to the collector of the CB modulator.
The same graticule can be used for modulation
percentage, clipping, etc. Modulation nonlinearity is easy to spot using the trapezoid
pattern.
The model CB44 is a good way to get some
more use out of that old but good narrow -band
scope. Quite a handy little device and it sells
R -E
for $75.

30MHz DUAL TRACE

OSCILLOSCOPE WITH DELAY
150

150

SPECIAL INTRODUCTORY OFFER

NORMAL PRICE $999.95

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FEB.28,1973

SPECIFICATIONS

5mV sensitivity

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MODE
1

UNCALIBRATED AND CONTINUOUSLY

VARIABLE IN BETWEEN STEPS
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DISPLAY MODES

Fixed delay (120n5)

20nS /cm sweep capability

AND AC PEAK,
CHANNEL I. CHANNEL 2, ALTERNATE.
CHOP 1230KHT1, X
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THE TEST EQUIPMENT SPECIALISTS

54 West 45

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212- 687 -2224

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III

Forest Belt tells...

What You Need To Know
About Tools
And Handy Gadgets
WHAT WOULD YOU THINK IF

TOLD YOU THAT TOOLS SERIOUSLY AFFECT YOUR PROFESSIONAL

life? They can and they d3. Selecting proper tools -and using them wisely
means almost as much tc fast, efficient servicing as test equipment. Correct
tools often make the difference between a rough, slipshod job and a smooth,
professional one, betwee i a repair that takes too long and one that is prompt
and quick. Believe me, tools control both your reputation and your profits.

Sometimes it's a matter of choice. For example, suppose you need to make a
-inch hole through a ca- top. Do you pick a chassis punch or a hole saw? Or
do you use a 7/8-inch twist -drill bit? How about a nibbling tool? Do you know
what all four of these tools are? Is your choice set by what you have on hand, or
do you own them all?
7/8

Each tool works in its cwn special way. To make a hole in flat, blank metal at
your workbench, anything but a chassis punch would be unhandy. Even a
chassis -nibbler is slow, b it it lets you cuit holes of almost any shape. However,
on a car top, you would find the chassis punch is awkward to manipulate and
the nibbler is ineffectual.

For drilling through a wall, only a dril bit makes sense; it's long enough, and
there is seldom a danger of rupturing anything on the other side. Yet, for drilling
through a metal car roof, a 7/8 -inch bit toes only a ragged, meandering job. And
you'll be astonished how suddenly the drill can gouge the upholstery beneath
the roof. On the other hand, a hole saw, with a 1/4 -inch guide hole
centerpunched and drilled with a stubby bit, takes out a 7/8 -inch circle of body
steel slick and clean. You would have to be very careless to mar the upholstery.
The point is, you choose tools to fit the task. But this presumes that you know
about all kinds of tools and gadgets. You should be familiar with them, and you
should own the right one:..
The proper too s can save you countless minutes, hours and dollars; and
you'll perform be'ter installations and repairs. This will assure you a reputation
that draws customers back for other profitable work.

www.americanradiohistory.com

Coping With

Wire and Cable

Tools that make your wire and cable connections look and
perform as if they were prepared by a factory machine.

CAN YOU, WITHOUT FUMBLING OR BUM -

bling, prepare a coaxial cable for a PL259 connector? Can you strip and tin an
8- conductor rotator cable and crimp the
proper-size lugs onto each wire? Do you
know how to splice two hookup wires
neatly and solidly and completely insulate them without using solder or messy
black tape?
If you can, you have most technicians
beat. The average technician, given any
of the above tasks, begins with a knife or
razor blade. Even if the resulting splices
or connections are not splattered with
blood spots, they seldom appear professional.

professional appearance, combined with

true speed and ease, find a stripping tool
that holds the wire gently as it strips off
the insulation. Of course, an elaborate
tool costs more, but by the second or
third time you use it, the minutes you
save have paid for the tool.
There's an important bonus too: Connectors fit better, can be installed faster
and stay in place longer when the wire or
cable has been prepared to exactly the
right dimensions and has no messy ends.
If you choose your wire-stripper wisely,
you can use it to cope with several different kinds of wires and cables.
Stripping techniques vary only a bit

with cable type. How much you strip

depends on the type of connector you
plan to attach. For crimped (or soldered)

with tools
.
However, they could .
that are now available, you can make
your cables and wiring look and perform
as if a factory machine had prepared the
connections. If you are meticulous, your
handiwork performs even better and lasts
.

longer.

Stripping and tinning

(lacking away at insulation with a
razor blade or knife is dangerous. It's
easy to slice a finger, and you generally
cut off more insulation than you intended. Also, it's difficult to gauge the
depth to which you slice until you spot
the nicks in the inner insulation, braid or
wire. Nicked wires break easily, especially later on when the wire or cable is
flexed. And snagged insulation invites
short circuits. (Old rule: If a wire can
short, it will!) Straggling strands of wire
or braid can also cause shorts, sometimes
in the most unexpected places.
The secret to stripping a wire neatly
lies in using a wire- stripping tool. If
you're adept, you can use the round stripping notch in the jaws of your diagonal
cutters. With plenty of practice, adept
technicians learn to strip insulation with
plain diagonal cutters or side cutters,
occasionally nicking or breaking only a
few strands. But both methods are makeshift.
Obtain a good wire -stripper for your
toolbox. You can buy inexpensive models
that include crimper jaws. For a really

IT'S
with
ping
ping

POOR PRACTICE to try stripping wires

diagonal or side cutters, even with a strip-

notch. Nicked wires soon break. A striptool does the job smoothly and neatly.

www.americanradiohistory.com

MULTIPLE -WIRE CABLES should be stripped,

tinned and fitted with lugs for proper connections. Lazy technicians wrap stranded wires
around terminals and eventually wind up with

short circuits.

COMPETENT WAY OF STRIPPING COAXIAL

CABLE without fancy tool involves stripper for
insulation and diagonal cutters to snip braided
shield back.

lugs, strip no more than '/4-inch of insulation from the end of the wire.
Tin wire ends after stripping, to prevent strand raveling. Soldering the wire
to a lug becomes easier; wrapping it
around a terminal screw is smoother; and
crimped lugs grip tighter and leave no
loose strands.
You can even strip coaxial cable with
some multipurpose strippers. Just set the
tool for the right diameter at each step.

Here's the procedure:

1. Strip the right amount of vinyl outer
covering;
2. Snip (with diagonal cutters) the
braid to proper length; and
3. Strip the center insulation.
The illustrations show two kinds of
strippers being used. Either one can manage coaxial cable by this technique outlined above. Note in the photos how the
stripper is set for step 1 -much larger
than in any of the notches. However, as
Table I shows, you can buy strippers
meant only for coaxial cable that do a
neat job -sometimes in one step.
You seldom have to tin the shielded
braid of coaxial cable. On hi -fi cables,
however, that are made similarly, you
may need to unwind some braid and tin
it. To tin any stranded wire, heat the
strands (after twisting) until the solder
melts and flows among the strands. Before the solder sets (cools), shake off any
excess. You don't want any blobs or tips
sticking out; they cause trouble.

Making terminations
Where screw terminals are involved,
most technicians take the "easy" way
out. They twist strands together, wrap
the wire end around a screw and then
tighten. This results in weak, sloppy,
careless and trouble -prone connections.

PLACE SEAM OF LUG BARREL in broad saddle

of crimper to avoid distortion. Some lugs don't
have seams. Tongue styles, left to right: spade,

flanged spade, hook and ring.

It's just as easy to attach lugs. Several

kinds of lugs are available, and all can be
attached to wires by crimping. For a
really solid job, take the time to tin the
wire ends before you crimp the lugs on.
On the other hand, you can make dependable crimped connections by just
twisting the strands tight before inserting
them into the lug.
Just one word of caution about crimping: Pay attention to how you orient the
barrel of the lug in the crimper. Place the
barrel seam in the larger cradle of the
crimping tool so that the smaller crimping tip indents the other side of the barrel
and doesn't spread the seam apart.
Choose lugs that fit the wire size; a
wide selection is available. You can even
buy kits of popular sizes and shapes, with
a crimping tool included. It takes just a
few minutes to crimp a lug on each wire
you plan to connect to a terminal screw.
Dependability, neatness and long life of
the connections are worth the extra trouble. You are a professional, right?
Terminating coaxial cables, whether
for communications or for TV or hi -fi, is
a bit more difficult but seldom takes
much more time. Once the cable is stripped to fit the connector, tin the stranded
center conductors. If the connector is to
be soldered on, tin the center wire even if
it's solid; it will bond easier inside the
connector. Tin the shield braid only if the
connector does not require that you
"fan" it out. If the braid is to be soldered,
form it to fit the connector and then tin
it. (Soldering is always easier if the wires
are tinned in advance.) However, do not
tin the connector's hollow center pin.
You couldn't run the center conductor as
deep as you need to for dependability.
With the right tools, you can crimp
connectors onto coaxial cable. An example is 'the PL -259 connector used in

TIGHTENING BOLTS of this Model 1100 Gold

Line crimper attaches PL -259 connector to
coax cable.

communications and CB radio. Gold

Line makes a bolt-operated crimper that
lets you squeeze both pin and shell for a
tight connection between the cable and
the connector. A hand -operated crimper
does a similar job. You prepare the cable
ends just as you would when soldering on
a connector, but instead of soldering, you
crimp. You must use a filler for the
center pin with small coaxial cables, so
the pin grips the center wire tightly.
Some coaxial connectors require only
pliers for installation. Ask your distributor to demonstrate the various types of
pliers, and select whichever is most convenient, neat and dependable for your
purposes.
Do not leave any bare wires near a
connector or terminal. Bare wires can get
crossed and short -out, or touch terminals
they should not. If careless soldering
melts the insulation near a plug or terminal, clip the ends and remake the connections.

Splicing wires
There are three ways to splice wires
without creating a mess.
One method is bulky for electronics
wiring, but it makes sense when you have
more than two wires to bring together,
yet don't have a vacant terminal strip
handy. Use a device called a wire -nut.
Just twist the bare wire ends together,
insert them into the wire -nut and wind
the wire-nut tight. Threads inside the
wire -nut grip the wires tightly, and the
outer shell insulates the multiwire splice.
Just be careful not to strip the bare ends
back too far; the wire -nut skirt must
extend well over the insulation on all
wires. Small wire-nuts don't take up
much space if you keep the wires short.
You can use shrinkable tubing to make
a two -wire splice look neat and stay insu35

www.americanradiohistory.com

TABLE I
Wire- Stripping Tools & Crimpers

Manufacturer
Brand

Model

AMP Inc.

None

0Q

c
o UF Remarks
/y Qti1WZ42
y
c)

Box 3608
Harrisburg, PA 17105.

Channellock

908G

10 -22

GC Electronics
400 S. Wyman St.

8176S

10 -22

Rockford, IL 61101.

766 -I

Meadville, Pa 16355.

744 -1

8 -22

802

10 -22

760

12 -20

733-1

Lugs

8 -22

8 -22

Gold Line

1111

Coax

Hand tool

Van Zant

1100

Coax

Boit- operated

Norwalk, CT 06855.

WIRE SPLICES CAN BE MADE with wire -nuts,

shrink tubing, crimped butt splicers. Coax cable and TV twin -lead should be spliced only
with connectors that do not upset impedance
of cable.

lated. A butt splice, with wires end -toend, is best. A twisted end splice done
this way can work if you're careful, but it
does not look as neat. Strip about' /4 -inch
of insulation for the end splice, or about
-inch for a butt splice.
For a butt splice, slip an inch or so of
shrinkable tubing onto one wire. Twist
the wires together and solder them. Slide
the shrinkable tubing down over the bare
portion of the wires, making sure it
extends well over the insulation. Heat it,
so it shrinks. A heat gun is best. If you
use a match or torch, you may melt the
insulation. Just apply the heat quickly
and then remove it.
A crimped butt splice is dependable,
neat and easy. Buy a box of butt splicers
to use with your crimping tool. Strip each
wire about '/4-inch. Insert one wire into
each end of the splicer, and crimp both
ends. Tug on the splice to make sure you
have a solid crimp on both wires.
Splicing coaxial cable, especially communications -type where impedance must
be kept constant, is done best by using
devices designed especially for the purpose. Do you have a damaged coaxial
cable? Just clip out the damaged portion
and install a PL -259 connector on each
one of the two free ends. Then, attach a
PL -258 double female adapter between
the two PL- 259's. This method is quick
and dependable. If the cable is located
outdoors, wrap it with tape or
permanence- shrink some large tubing over
the three connectors.
Some technicians splice 300 -ohm flat
twin-lead any old way. But this is poor
practice, creates ghosts and sometimes

ideal

T5-T7

1842 Tannery St.

Great Bend, PA 18827.

T32
T33

TV lead

45-164
45-090 to
45-098

8-30

Radio Shack

64 -2268

12 -18

Lugs

2617 West Seventh St.

64 -405

12 -18

Lugs

Fort Worth, TX 76107.

64 -1952

12 -24

64 -2129

12 -24

64 -1918

-22

T-1710
1900

'/

-for

10 -30

Lugs
10 -22

Lugs

Waldom

H3A,H4A

Lugs

4641 W. 53d St.

CT-4070

Lugs

Cuts No. 4-No.

Cuts No.

10

bolts

4 -No. 10

bolts

Chicago, IL 60632.

Xcslte

100

P.O. Box 728

Apex, NC 27502.

103S

Utility Tool Corp.

UT-5800

RG-58/U

46 Nooks Hill Rd.

UT-8000

RG-8/U

590

Cromwell, CT 06416.

color problems in TV receivers, and is

needless. You can buy male and female
extension connectors and attach them to
the free ends of the antenna leads (tin the
stranded wires), then plug the two connectors together. Outdoors, cover them
with tape or shrinkable tubing to keep
out moisture. This splicing method works
even for shielded 300 -ohm cables, if you
solder the shield ends together underneath the tape or tubing.

Four wiring criteria

Tools and techniques for handling
wires and cables are successful only if
they enable you to meet four criteria:
1. Connections and splices must look
neat, visibly proving your professional-

ism.
2. Connections

and splices must be

www.americanradiohistory.com

electronically sound, and must stay that

way. Otherwise, you can expect callbacks. Insulation must also remain intact.
3. Connections and splices must be
mechanically solid and secure. Vibration,
normal tugging and even mild abuse

should not break or loosen your wiring.

4. Connections and splices must be

weatherproof. Moisture and corrosion are
serious enemies of electronic wiring.
You will never regret owning and using
the tools it takes to maintain these stanR -E
dards of quality in your work.

Handy Gadgets

That Speed Up Service

Tools and gadgets that save time and
make your workbench more enjoyable

EXPERIENCE INTRODUCES YOU TO A LARGE

array of tools and gadgets that other technicians find useful. And, if you browse
your distributor's shelves and racks occasionally, you can find a few devices of this
nature yourself. You should keep an eye
out for them because without spending a
great deal you can end up saving money.
Anything that makes servicing jobs easier
also makes them faster. And saving time
puts money in your cash register.
Sometimes you know the item you
need but don't know where to find it.
Perhaps you saw someone else using it, or
it appeared in a magazine ad (an excellent
place to find new servicing aids). Maybe
you read aboutit in a catalog, but you
can't remember whose.
What follows is a list of handy servicing gadgets you should know about. Probably you already know about some of
them since they've been around a long
while. They're included in this article for
newcomers who may not have spotted
them yet. Other items you may have
heard of but have not known where to
find them. I have listed sources for all
these service aids.
You can also ask your electronics distributor (he can't display all his inventory). He can order an item if you tell him
who makes it.
Some devices are so relatively new that
if you don't keep up-to -date with catalogs
or magazine ads, you might have missed

ATTACHE CASES ARE THE "IN" WAY to carry

tools on service calls. Platt Luggage model
BOOT holds tools for technicians.

some. I hope you will find at least a

couple of items here that can save you a
lot of time and money over the next few

months.

Tool cases and kits

In keeping with modern professionalism, there is a trend toward carrying tools
in neat, trim attache -type cases. No more
tool pouches slung low on a belt; no more
tackle -box -type containers mixing tools
among junk; and no more dumping your
tube caddy on the customer's floor or
even on a dropcloth.
One company that provides cases is
Platt Luggage. Their model 600T is considered best for electronics technicians.
Pallets can be made up to hold whatever
tools you want to put on them. Some
pallets come ready-made, with a list of
tools that fit and plenty of room for larger
tools in the bottom of the case.

Vaco assembles a broad selection of

hand tools in a kit for in -home servicers.
The model 70260 Super Case holds 48
tools for bench work and service calls.
This careful pallet arrangement insures
neatness and cuts down on lost and
damaged tools.
Techni -Tool Inc. offers similar tool
kits. Their small tool arrangements are
housed in zippered vinyl cases. Larger
sets come in attache cases, with pallets
that hold the tools in their own specific
slots. Heavy outfits, such as for air- conditioning repair or servicing heavy machines, come in steel tool boxes with
trays. Techni -Tool has grouped the tools
necessary for many specialties: the model
7609 is suitable for house calls; the model
7603 contains installation tools.
Carrying all the necessary tools in one
pack obviously saves time and effort, and
it also saves tools. GC Electronics makes
a rollup pack (model 8283) full of alignment tools for TV and communications
just about any electronic adjustment job.
Another pack, the model 5050, carries a
comprehensive array of alignment sticks
along with numerous small specialty
tools -such as a stripper, a crimper,
tweezers, soldering aids, a neon tester, a
low -volt tester, a fuse puller, a heat sink
for soldering, and many more.
Jensen Tools and the Electronic Tool
Co. also provide kits of tools for us in roll up packs or hard cases.

THIS QUICK -WEDGE FROM KEDMAN holds

screws while you start them.

www.americanradiohistory.com

KIT OF TOOLS FROM VACO, neatly arranged in

Super Case, includes most of what you need for
home calls or at the electronics bench.

POCKET -SIZED HANDY-TOOL from Weller

Xcelite fits slotted and Phillips screws, plus '/.inch and '/,. -inch hex -type screws.

CHASSIS CRADLE -indispensable to

changer servicing.
GC

Small handtools
Sometimes situations arise in servicing
that can waste minutes -and therefore
hours over weeks and months. A number
of small tools exist only to rescue you
from those embarrassing and generally
profitless moments.
For example, how many times have you
dropped a small screw or nut down into a
crevice just out of reach? At such times,
you wish for fingers that are '/s -inch in
diameter and 10- inches long!
What you could do is reach into your
toolbox and pull out a GC Electronics
flexible pickup tool, model 5059. It's 24inches long, reaches deftly around corners and closes its little gripper "fingers"
firmly around the lost object. It also holds
tiny screws so you can start them in out of- the -way places, or in areas such as
beside an IF can where your own fingers
won't fit. One pickup tool can hold a tiny
nut while another one turns a tiny bolt.
Somewhat similar are three types of
screwdrivers that hold onto screws: One
is typified by the Quick -Wedge made by
Kedman. It has a split double blade
surrounded by a metal tube. Pushing the
tube toward the tip thickens the split
blade in the screw slot. This wedging
action grips the screw as you insert it and
start threading it. Vaco uses the same
principle in their K- series screw -holding
drivers. Phillips screws are harder to hold
this way, but certain Vaco models manage it. However, you can't drive Phillips
screws with these tools; you can only
insert them and start threading them.
Another kind of holding screwdriver
has a hollow blade, all the way to the tip.
A small shaft inside the blade can be

rotated; a small bit in the center of the

screwdriver bit twists and grips the sides
of the screw slot.
A third version has little "fingers" or
clips similar to those on the pickup tool
mentioned earlier. You slide the finger
clips down the blade until they snap onto
the screw head. Then you insert the screw
and start it. Before you tighten the screw,
tug on the screwdriver and a spring pulls
the clips free. Slide the clips up out of the
way, and you can then tighten the screw.
The only one of these we have found is
GC model H3 -433. This principle also
works well with Phillips screws. Kedman
makes a Phillips -holding screwdriver, the
model CP-24, that incorporates this
idea.

Magnetic screwdrivers and nutdrivers

made by Weller -Xcelite accomplish the
same purpose. You can start hex -head
screws quite handily with magnetic
drivers.
Magnetic tools are also handy for
retrieving dropped bolts and nuts, for
example, the magnetic retriever probe

blades are also available.

With respect to nutdrivers, an old standby tool for many technicians is the

Xcelite model 600 four -way pocket tool.

The handle is a '/.-inch and '/.6 -inch
nutdriver, and the '/.6-inch end accepts a
short, reversible slotted- and -Phillips
screwdriver bit. Many techs and homehandymen own a half -dozen or more of
these versatile multitools -for the kitchen, workshop, toolbox, car, truck, and in
the service caddy.
There's also a new self- adjusting nut driver from Vaco, listed as the model
SA711. Just push it onto any nut or hex screw head from '/. -inch to '/16 -inch; and
it fits automatically.
Here are some other tools worth mentioning. OK Machine and Tool Company
makes a wire -wrapping tool, the model
WSU-30, that lets you unwrap this kind
of connection and restore it neatly when
you're finished. The battery -powered
model BW-630 works faster than the
hand tool. Vector also makes a line of
manual and powered wire -wrap tools.
Their Slit-N -Wrap versions even string
the insulated wire from connection to
connection while making wrapped joints

'

POMONA DIP CLIP for DIP -type IC's takes the

difficulty out of testing IC's with snap-on clip
that brings connections up where you can

rasch them.

RATCHETING BALL -SHAPED HANDLE of White

Products' Easydriver offers unique alternative
to ordinary screwdrivers and nutdrivers.

from GC, the model H3-494.

Speaking of screwdrivers, ask your distributor for a demonstration of the Easydriver made by White Products. This tool
has a ball- shaped handle, made of Lexan.
The ball -head design allows you to apply
the strength of your hand and arm in just
the right direction for plenty of torque.
But the most unusual thing about the
Easydriver is that it ratchets, in either
direction. In many situations, this feature
can be a real timesaver. This tool comes
with blades for slotted and Phillips
screws, plus ' /.- and 3/s -inch nuts; other

MAGNIFIER, SURROUNDED by 8-inch fluorescent lamp, shows parts and connections 11/2
times actual size -almost necessary in miniature equipment so prevalent nowadays.

www.americanradiohistory.com

AUTOMATIC NUTDRIVER FITS SIZES from '/.inch to '/,. -inch without changing blade.

DIRECTING TINY JET OF AIR onto specific part

or spot on circuit board, Wahl Clipper tool

PANEL eliminates
power -cord `octopi" for test gear on your
service bench. Circuit breaker and master
switch offer protection and convenience.
SGL WABER ELECTRIC

takes power from cordless soldering iron.

where needed. Vaco offers their model

70007 outfit for removing screws that are
stuck and have their head slots stripped.
And, for removing and reinstalling snap rings without flipping them all over the
shop, try the Vaco model 70195 SnapRing Plier; it's slip -jointed to fit a broad
range of snap-ring sizes. Channellock
specializes in pliers with adjustable jaw
sizes and also makes a full line of electronics hand tools.
Finally, have you stripped a threaded
chars hole lately? Vaco's model TT31
tapping tool lets you quickly run new
threads for 6 -32, 8 -32, or 10 -24 standard
bolts.

Time savers at the bench

Here's a time -saving device that's been
around a long time. It's a tool called a
chassis cradle. GC Electronics makes
one that works well -their model 5212.
The chassis cradle holds almost any size
cassette or tape- machine, record -changer
(it's a must for them) or stereo chassis,
and positions it so you can reach components or adjustments easily. It certainly is
an improvement over propping a chassis
up with boxes and solder spools.
Panavise makes a full line of small vises
that are a must for any bench.
The Lafayette Radio Electronics catalog shows an X -Acto device called Extra
Hands (Order No. 13R74289). This tool
won't carry anything heavy, but it's great
for holding plugs and such items for
soldering. It treats the objects it holds
more gently than a vise.
If you value your eyesight, don't do a
lot of work in CB radios or other small
PC -board sets without using a bench
lamp /magnifier. Lafayette Radio and Allied Electronics both list such lamps in
their catalogs. Your distributor probably
has the Luxo version. These lamps incorporate a circular fluorescent bulb surrounding a 5 -inch magnifying glass.
Many trouble -shooting jobs may require
two such lamps: one for viewing the PC
board and components, and one for
studying undersized schematics.
Any technician faced with an intermittent knows that it could be a thermal.
Troubleshooting takes a special technique: you cool, then you apply heat.
Suspect components are cooled with
sprays such as GC's Freeze-Mist; Chem tronics' Freez-It; Tech -Spray, Inc.'s Mi-

fits on top of your bench or desk, consider

the 8- outlet model 97CB -15.
INSERTING DIP-TYPE IC'S into socket or PC
board is easier with Techni -Tool gadget that
squeezes pins while you plug in the IC.

nus 62 Instant Chiller; or Rawn Company, Inc.'s Freeze. (Keep these sprays off
hot vacuum tubes.) Then you turn right
around and heat the suspected part or
board. Since a hair dryer is seldom hot
enough, use a heat gun such as the
Master -Mite model 10011, manufactured by Master Appliance Corporation.
It has three heating nozzles and a deflector that narrows the hot air down to a
concentrated blast. The gun is hot enough
to shrink most heat -shrinkable plastics
too. Wahl Clipper also sells a small thermal "tester." It's a handheld blower that
directs a 260 F stream of air at a very
small spot.
For a quick way to "wire up" your
service bench, consider the electric outlet
strips offered by SGL Waber Electric.
The model 25PCB-15 contains a master
switch, a circuit breaker for the whole
panel and seven 3 -wire outlets-each
with its own pilot -lighted switch. Fasten
the panel to your bench with four mounting screws, plug in your instruments and
plug in the 15 -foot 3 -wire (U- ground)
cord. If you prefer a "console" type that

ct5o

FREEZES COMPONEN
F'
INSTANTLY TO
QUICKLY LOCATES_.,os
THERMAL INTERMITT
FreezIS5

TRONICSINDUSTRIALCRaIlUO

..

r'',,.r.
ITIQNCONTFNTSUNDENNN'
uiMuXrmro,..nmrxnr0.e,

CHEMTRONICS C -150 Freez- ttrapidly localizes

Intermittent components in circuits.

www.americanradiohistory.com

Help around PC boards

Although PC boards have been around
for a long time, they still worry many
technicians. Some techs, for example,
have not accepted the idea that you can
open circuits by slicing the foil. It is easy
to bridge the slit later with solder.
But just on the off-chance that you
develop a case of the clumsies, keep a
bottle of GC's Copper Print (Catalog No.
20 -2) or Silver Print (Catalog No. 21 -2)
around. If you overheat a foil and it separates from the board, just snip it off.
Then, with a fine brush paint a new copper
or silver conductor. Dab the paint generously where components join the new conductor. Then spray on a covering of Silicone Resin Lacquer (Catalog No. 14 -6).
You can't repair many electronic devices today without encountering IC's.
Some problems involve testing: How do
you reach all those closely spaced and
nearly inaccessible pins? You can buy
test clips that snap right onto the DIP.
One manufacturer of these gadgets is
Continental Specialties Corporation, and
another is ITT Pomona Electronics. Pomona calls their clip, appropriately, the
Dip Clip. It comes in several sizes to fit
IC's having 14, 16, 24 or 40 pins.
Rye Industries markets clip-on devices
called Kleps, made in many sizes. E -Z
Hook Test Products also offers a highly
versatile variety of clip -on test probe.
In some sets you could get lucky. The
IC might be in a socket rather than
soldered to the PC board. Either way,
however, the DIP could be difficult to
plug in. The two rows of holes are not as
far apart as the two rows of pins on the
DIP. A device, such as the Techni -Tool
model 4990 Inserter, can squeeze the pin
rows slightly inward as you push the DIP
into the socket or PC board. Easy if you
have this tool; not always so simple if you

don't.
Save save save time time time
You should know by now that the way
to make more money in electronics servicing is by working faster and smarter.
Better tools and a surer knowledge of how
R -E
to use them are important.

Tricks of
Soldering / Desoldering
Constructor, experimenter and service technician all
need to know soldering. Here's what it is all about

SOLDERING IS THE MOST BASIC SKILL A

After four days on the job, he almost lost

service technician must have. Yet, oddly

enough, hardly any schools or courses
teach soldering techniques.
For example, a young graduate of a
two -year program at a private electronics
school was hired by the small service
department of a music store to repair
music amplifiers, auto tape players and
low -cost stereo systems. He lasted less
than a week! In two returned repairs, his
boss saw grossly botched soldering; both
callbacks were a result of messy parts

his new position. He had never learned to

replacement.
Another example: A seasoned TV technician won a chance for much higher pay
when he switched companies. His new
job -with a modern, up-to -date firm
entailed work on auto radios, CB transceivers, video games, some home computer products and the newest TV receivers.

/ELECTRONICS -SCHOOL GRADUATE made

this kind of mesa trying to solder new parts into
a chassis.

replace multipin IC's. After the technician ruined a few new IC's, the service
manager assigned him to a young technician who taught him to desolder and
remove DIP -type IC's, clean up the board
and then install a new IC without bending
pins, cracking cases or overheating the
IC's.
How could these situations develop?
Apparently, soldering ability has come to
be taken for granted. Schools assume the
student will learn to solder on his own.
But just as a thorough knowledge of
theory does not assure an ability to troubleshoot electronic gear, neither can a
technician necessarily learn how to solder
well without some guidance.
Tool manufacturers have developed
dozens of aids to proper soldering and
desoldering. Yet good tools do not alleviate the need for some understanding of
the principles of soldering. Technicians
who "learn by doing" often find that,
despite years of experience, their parts
replacements look messy. Sometimes
their soldering masks faults that contribute to callbacks and endless trouble -hunting.

solder. For example, 40/60 solder contains 40% tin (always listed first) and
60% lead. Tin melts at a much lower
temperature than lead -about 360 F.
Hence, 40/60 solder begins to soften
(become plastic) at that temperature. Because of the high lead content, 40/60
solder does not become fully molten until
its temperature reaches 460 F. The range
between these two temperatures is called
the solder's plastic range.
For electronic soldering, a narrower
plastic range must be used. A 50/50
solder begins softening at 360 F, and
melts completely at 415 F, which is still
too wide a range. Because the solder stays
plastic (soft) longer as it cools, fractures
can occur in the solder joint if a wire or
component shifts slightly.
You'll find 60/40 solder is the best for
electronic circuit soldering. Its plastic
u

HEAVY -DUTY

HEXAGON

SOLDERING IRON

produces 300 watts to heat large areas for

soldering.

Not too hot, not too cold

Solder consists of tin and lead. Proportions determine the melting point of the

SOLDERED JOINTS, GOOD AND BAD, depend on tools, solder, temperature and technique. Left
a poor joint. Good joint (right) has a bright silvery surface.

photo shows the dull solder surface of

www.americanradiohistory.com

WELLER SOLDERING GUN is still popular for

many soldering chores; current heats wire tip.

range extends from 360 F to a peak of

375 F. Therefore, it melts quickly once
enough heat has been applied, and cools
quickly when heat is removed.
One advantage to using this 60/40 tin
and lead mixture, with its quick heating cooling range, is that you are less likely to
injure temperature -sensitive components.
Solder flows properly only when you heat
the entire joint -the component lead and
a
the terminal or circuit -board foil
temperature that melts the solder. If
heating either part of the joint takes too
long, the heat conducted by the component leads may damage the component.
Therefore, a quick -melting and quick-

-to

cooling solder reduces parts damage.

(Note: For additional protection, place
heat -sink clips or forceps on delicate part
leads.)

How and where should you apply the

heat? Common sense helps only if you
understand certain thermodynamic principles. Always apply soldering heat first
to the heavier or least heat -conductive
portion of the joint. As that side heats up,
if the joint is solid mechanically, heat
spreads to the lighter portion. By the time
the heavy side melts the solder, the thinner side is almost ready. Touch solder to
the heavy portion, and when the molten
solder flows, it finishes heating the thin-

ner or lighter material.

If both surfaces are clean and /or well tinned (more on this later), solder covers
all surfaces quickly and thoroughly -an
action called wetting. Molten solder penetrates the metal surfaces slightly. As it
solidifies, the solder bonds the surfaces. If
nothing disturbs either side before the
solder drops below 360 F, a solid, electrically sound joint is created.
Heavy materials take longer to heat;
they also retain heat longer and thus cool
more slowly. You must be careful that
neither object moves before the solder
cools below its solidifying temperature.
You soon learn to spot when a solder joint

TABLE I
SOLDERING IRONS AND GUNS
Po
`CI

Tip Temp.
attage

Brand

Model

Edsyn

ER 140

16

15958 Arminta St.

950CL080

50

Endeco

520 -3

20

5127 E. 65th St.,

Indianapolis, IN 46220.

525-3

25

C!

(F)

4is,

/ "iCr

Remarks

Van Nuys, CA 91406.

540-3

40

540S -3

20/40

GC Electronics

H3 -380

30

3225 Exposition Plaza,

H3 -384

30

TIPS OF WAHL CLIPPER cordless soldering

iron are isolated from handle, concentrate heat
at tip.

700
800
970
700 0/970
Barrel tip

Los Angeles, CA 90018

Beacon

21A, 22A, 23A

15 -60

161 W. Clay Ave.,

24S, 25S, 26S

20-60

Roselle Park, NJ 07204.

P24, P25, P26

P70 -P338

HD85 -HD800

25 -60
100 -300

90 -800
20

570

1180 S. Beverly Drive

30

700

Los Angeles, CA 90035

40

770

60

780

Kager International

KL -3000

Radio Shack (Archer)

64 -2066

30

2617 West Seventh St.

64 -2190

100/140

Fort Worth, TX 76107

64-2073

25

64-2065
64-2071
64-2080 series

30

Ungar
233

E.

Manville,

Compton, CA 90220.

Wahl Clipper

42
27, 42, 50

6900 series

10 -18

360 series

27 -45

6200 series

25 -55

100 series

27 -45

to meet all needs

s

640
640
640
650 , 800 ,
900

575 -850
650 -950
600 -1150
650 -1000

Modular design
Modular design
Modular design
Modular design
Modular design

200

cordless;
quick charge

7900

Cordless;
solder feed

7700

7500,7800

50

700

Cordless;
quick charge

50

700

Cordless

Weller

8200 -3

100/140

Wire tip

P.O. Box 728, Apex, NC

D550 -3

240/325

Wire tip

27502.

GT7A -3, GT6B -3

150,150

Wen
5810 Northwest Hway,
Chicago, IL 60631.

700 , 600

700

WC -100

WP25 -3, WF'40-3

25, 40

W60, W100

60, 100

UNGAR SOLDERING IRONS incorporate "modular" idea-you can select operating conditions
to suit the kind of soldering you need to do.

Barrel tip
Wire tip

2902 Locust St.,

Sterling, IL 61081.

Barrel tips. Variety

Barrel tip
Cordless

700
700

100

100

Wire tip

199

130

250

250

Wire tip
Wire tip

288

200

Wire tip

222

25 -200

Barrel tip

450

25 -450

Barrel tip

75

50

Barrel tip

DESOLDERING REQUIRES ONLY that you

squeeze the bulb and release it when solder
becomes molten. To resolder heed, place solder
at joint and let hollow tip melt it into neat, solid

connection.

Molten solder is shiny; cooled

solder acquires a dull appearance. Even
then, as long as the joint is still too hot to
touch, hold it immobile a few moments
longer. That lets the innermost core of
the joint cool to below 360 F.
has cooled.

Tools for soldering

Several companies that make soldering
guns and irons are listed in Table 1. You
may find others at your electronics parts

distributor.
A good soldering iron must transfer
i.-at efficiently to the components of the
joint being soldered. This ability stems
partly from tip temperature, partly from
tip size and shape and partly from how
easily you can apply the tip to transfer
41

www.americanradiohistory.com

heat quickly and effectively.

Temperatures range widely. Anything
under 500 F probably won't work fast
enough. Some soldering irons and guns

bring tips to as high as 900 F. The

average temperature is around 700 F,
which is good for soldering or unsoldering most electronic joints.
Do not confuse heat with temperature.
Heat is what brings the joint and solder to
its melting temperature. Soldering thin
wires and leads to thin foils takes very
little heat, yet calls for the usual
360 -370 F to melt the solder. Thicker
wires demand more heat to bring them up
to melting temperature. Soldering to terminal lugs takes more heat than soldering
to PC foils. Soldering to a chassis or other
solid metal places heavy heat requirements on a soldering iron or gun.
That's why you see so many sizes of
soldering tools. Usually, wattage rating
correlates with heating capability. A 30watt pencil iron heats PC foils without
overheating them. A 100 -watt iron or gun
may, if it touches the foil too long, overheat foil and board enough to bring about

foil separation.
However, a 100 -watt tool could not
solder even a thin wire to a chassis,
because the chassis must also reach solder- melting temperature. A 250 -watt
iron or more would be necessary. Without enough heat to bring chassis -metal

temperature high enough (360 ), there is

no wetting action of the solder on the
chassis. Penetration fails to occur, and the
result is a cold -solder joint that has poor
electrical conductivity (especially for
RF), corrodes easily and is mechanically
unsound.
Heat requirements break down approximately like this: For soldering transistors
and other tiny -wire components to PC
boards, use 20 to 40 watts. To solder
components with heavier leads, such as
ordinary resistors and capacitors, you
need 40 to 60 watts. Soldering to terminal
boards and tube sockets demands around
100 watts.
You must remember that the heating
capability of a soldering iron or gun must
suit the largest surface or area of the item
you heat. Heavy, solid wires of the variety
used in electrical wiring need 250 watts
or more. Hence, you choose an iron
according to purpose. You probably will
want to own more than one size. It won't
do to apply a heavy -wattage gun or iron to
delicate IC's and the like, nor can a small
iron do heavy soldering.

Guns and irons

What else do you look for in a soldering tool? You can choose between a
gun or an iron. Irons can range from tiny
pencil units to 800 -watt mammoths that
solder sheet metal. Add to these a variety

TABLE
Brand

"third hand"

feeds solder to the work.

One example of such an iron is made by
Kager and is shown in the photos. Sure
comes in handy when you need one hand
to hold the iron and another for the
work.
When you work with delicate IC's and
FET's, static and leakage electricity can
cause problems. For instance, a tiny pulse
discharge from your soldering tool can
blow a junction. Some irons are rated as

"fully grounded."
It's not enough to insist on 3 -wire
power cords, although a good idea for
personal safety. Proper protection against
static at the soldering tip goes farther.
You can test for leakage by just plugging the iron in and turning it on. Set
your high -impedance digital multimeter
for AC Volts and touch one probe tip to a
known outside ground. Touch the other
DMM probe to the iron tip. If the meter
reads as little as I volt AC, there is
leakage to an ungrounded tip.
Weller, Ungar, Edsyn, and Wen are
among the best known makers of soldering tools. Almost every technician is
familiar with the Weller model 8200 and
its predecessors, with their inexpensive
continued on page 81

DESOLDERING TOOLS

Model or
Part No.

Type

DE180
AS196

Spring -loaded DIP heater /extractor

"Soldapuilt" spring -loaded piston -type sucker

500 -3
510 -3

40W bulb -type desoldering iron; many tip sizes

20- to -40W bulb -type desoldering iron

R916
898F
882

DIP tip for soldering iron

GC Electronics
3225 Exposition Plaza,
Los Angeles, CA 90018

684 -H -390

Solder Braid

Radio Shack
2617 West Seventh St.
Fort Worth, TX 76107

64 -2085
64 -2086
64 -2090

Piston-type spring -loaded sucker

Rubber squeeze -bulb sucker
"Solder -Up" fluxed braid

Solder Removal Co.

40 -2 -5

1077 E. Edna
Covina, CA 91724.

none

"Removic" DIP desolder /extraction station

"Soder Wick" fluxed braid

Tech -Wick
Mohawk Equipment Co.

S -16, R -20

"Tech- Wick" fluxed braid

7800
6943 -46
6948

Bulb -type desoldering iron

Circular TO -5 desoldering tip for iron
Tunnel DIP desoldering tip for iron
Slotted capillary tip for iron
Block DIP desoldering tip for iron

Edsyn
15958 Arminta St.,
Van Nuys. CA 91406.

Endeco
5127 E. 65th St.,
Indianapolis, IN 46220.

Hexacon
161 W. Clay Ave.,

Roselle Park, NJ 07204.

THIS SOLDER JOINT HAS just been desoldered. The hot solder has been sucked away
leaving a component pin that will easily pull
free from the circuit board.

II

of cordless irons, and you see why you

might have difficulty choosing one.
There are even a large number of
"third hand" types of soldering tools. The

Tunnel tip for soldering iron

Rubber -bulb solder sucker

Box 4490
Yuma, AR 85364

Ungar
233 E. Manville,
Compton, CA 90220.

857
858
6982
6983
DESOLDERING TOOL FROM EDYSN is a handheld spring -loaded vacuum device that helps
protect FET and MOSFET devices from failure
due to static electricity.

Weller
P.O. Box 728,
Apex, NC 27502.

AC303P
DS40 -3
DS100

www.americanradiohistory.com

DIP lifter
TO -5 lifter

Rubber -bulb solder sucker

40W bulb -type desoldering iron
Desoldering station

lieMN
bglEgTgET

RITB3

Built around a single IC, this device is

used to test the response of a hi -fi
system and to set up a graphic equilizer
JEFFREY G. MAZUR
A VITAL COMPONENT IN ANY SOPHISTICATED AUDIO SYSTEM IS A

graphic equalizer. This device allows you to taper the frequency

response of a system to fit a particular need. An equalizer is used
most often to match the audio system to room acoustics to
achieve an overall flat response. Minor variations can also be
made to please individual tastes or to correct for equipment
deficiencies.
A typical equalizer can have as few as five or as many as 30
individual controls per channel depending upon the division of
the audio frequency spectrum. Each control has a frequency
range that follows a regular pattern. The most common pattern
is an octave equalizer, in which each control covers the next
octave, or doubling of frequency, from the one before it. Some
equipment owners consider a graphic equalizer as a "super tone
control" unit and often set the controls in an undefined or even
random fashion. However, a more consistent, technical approach is needed for the instrument to be used as a room equalizer. One method for checking system response is to use a spectrum analyzer. Since most of us do not own (or cannot borrow) a
spectrum analyzer, there is a less expensive alternative: a pink noise generator that can be built for less than $10.
The color of sound
Pink noise and white noise are terms that describe a complete
mixture of all frequencies in one signal. The difference between
the two terms lies in the relative amplitude of each frequency.
White noise is characterized by equal energy per bandwidth.
This means that there is an equal amount of energy, or loudness,
in the frequencies between 20 to 40 Hz as between 40 to 60 hz
or 1000 to 1020 Hz.
Pink noise, on the other hand, is characterized by equal
energy per octave. Since an octave doubles the frequency, this
means that there would be the same volume in the frequencies
between 20 to 40 Hz, 40 to 80 Hz, or 640 to 1280 Hz. This is
why pink noise is used in setting up an octave equalizer, whose
controls follow this doubling pattern -the bandwidth (range of
frequencies) of each control also increases by a factor of two.
Incidentally, it is a popular misconception that the noise
generated between stations on an FM tuner is pink noise. This is

not so. Interstation noise more closely resembles white noise,

but not successfully.
Room equalizing
By feeding the pink-noise signal into an audio system through
an equalizer, we can measure the overall response (including
speaker and room acoustics) at each octave, or whatever bandwidth each control has. If the system is flat, equal loudness is
obtained from the bandwidth of each equalizer control. Therefore, if you pass the pink noise through each control band separately and measure the volume from the speakers, you can set
the response to be flat (or any other desired curve).
First, selectively isolate each equalizer filter. For a bandpasstype equalizer, as shown in Fig. 1, each filter section passes only
those frequencies within its passband and the equalizer control
varies the output from each filter. If the controls work to ground
as shown in Fig. -a, you can isolate one filter section by placing
all the other controls to their minimum position. If the controls
are located somewhere else in the circuit, you can add switches
to turn each individual filter on and off, as shown in Fig. -b or
Fig. I -c.
Figure 2 shows a "cut -and- boost" type of equalizer, in which
each filter passes all frequencies with the appropriate effect only
on the frequencies within its band. Thus, there is no way actually to isolate each filter separately. However, placing all but one
control to their minimum position ( -12 dB, for example) can
effectively single out one audio- frequency band. Whatever
effects that "bleed over" from the other filter sections have
remain constant and do not affect the relative measurements.
The second requirement for effective room equalization is a
means to pick up the sound from the speakers and display its
relative amplitude on a meter. Most hi -fi systems have a tape
recorder with a microphone input and a record -level meter.
However, if this equipment is not available or you want a more
accurate indication, you can construct a simple relative -volume
indicator, as shown in Fig. 3.
1

Circuit
The design of a pink -noise generator

www.americanradiohistory.com

is

greatly simplified by

C4

C3

C5

Si

ICI

C2

Cl

+12 dB

SLIDER

-12

dB

INPUT
STAGE

R4

R3

R2

R1

135

C6

C7

INSIDE THE PINK -NOISE GENERATOR. Its few parts are mounted on a
small piece of perforated circuit board and connected by point-to-point
wiring. The IC is in a socket.
FILTER SECTION

IINPUT
BUFFER

"SPST
SWITCH"

OUTPUT
BUFFER

12dB

FROM
INPUT
STAGE

TO OTHE
I

TO

FILTERS

0dB

SLIDER

-12dB
ADD SPST SWITCH

SECTION

SPDT
SPOT
SWITCH"

ADD SWITCHES
TO ALL FILTERS

FIG. 2 -IN THE CUT-AND -BOOST TYPE equalizer, you can't isolate each
filter but you can minimize effects of the unwanted sections by turning

them all the way down.

BREAK AT X -X AND
INSERT SPOT SWITCH

24V

1-TYPICAL BANDPASS-TYPE EQUALIZER designs. With the srrangement st a, filter circuit is cut out when slider-type level control is at
the minimum-gain or ground and. Partial circuits at b and e show how
switches can be added to ground the input to the filter section.
FIG.

METER

MIC
INPUT

CALIBRATE

10pF
10K

the availability of a single -IC white-noise source, the MM5837.

All this IC needs is power to start generating white noise. To get
pink noise, it is necessary to recall the relationship between
white and pink noise. Since white noise has equal energy per
bandwidth, and since the bandwidth per octave doubles, the use
of white noise produces double the energy per octave. Thus, the
white noise must be passed through a filter that will reduce the
signal amplitude by 3 dB- per -octave. Figure 4 shows how this is
done.

Construction
A pink -noise generator is simple to construct. You can
assemble the components on perforated board, and the entire
unit can be mounted inside the equalizer and connected to its
power supply. To prevent spurious signals from leaking into the
system, provision should be made to apply power to the generator only when it is in use.
The generator can be housed in a small box with just an on -off
switch and a phono jack for the output. Since the MM5837 is a
MOS device, handle it with the usual precautions during
construction.

Using the generator

Simply turn the generator on and connect it to the input of
your system. If the unit has been installed inside the equalizer,

VU

MIC

SENSITIVITY
2K

22K

2252

330p

2K

3-

SIMPLE RELATIVE- VOLUME INDICATOR can be made using one

FIG.
IC and a few parts, including an inexpensive meter.

it to the equalizer input. If the generator is used externally, feed the signal into the AUX, TAPE or other high -level
input. In a stereo system each channel is equalized separately.
Figure 5 shows for a typical arrangement.
Since all controls are adjusted relative to each other, one
control can be arbitrarily set anywhere. For convenience, the
middle control is chosen (or the control that affects frequencies
of around 1000 Hz), and set to its center or flat position. All
other controls are set to their minimum positions or switched
off. To get a relative volume reading, place the microphone in a
normal listening position and connect it to the tape- recorder
input or level meter. Adjust the input level to O VU. Then, turn
the middle control down and the first control up. Adjust this
control for the same 0 VU reading. Mark the position of the

connect

www.americanradiohistory.com

Sl

9V

BATT

1 I-3-

RECORDER

EQUALIZER
7

R2

3K

R3
1K

NO

CONNECTION

AUX
TUNER,
OR TAPE
INPUT
_

R4

30052

C2

C3

C4

C5

1F

0.27

0.047

0.047

C6

J1

0.033

OUTPUT

STEREO RECEIVER

PREAMP

WHEN BUILT
INTO

MM5837
2

TAPE

INPUT

(OPTIONAL
CONNE TION

C7
10011E

R1

6.8K

MIKE

PNG

l'
I

I
T

LISI

REA

E-01

RIGHT

EC)

POWER

AMPI

ii

MIKE

5- CHECKING A TYPICAL STEREO SETUP. Mike is in normal

listening position. Each channel is equalized separately.
F G.

4- SCHEMATIC

DIAGRAM of the pink -noise generator. When

installed inside the equalizer, its output is fed to the equalizer input. The
battery can be replaced by any supply voltage between 7 and 24 volts
FIG.

DC.

PARTS LIST
All resistors are'/. watt, 5 %, unless noted.
All capacitors 10 %, with voltage rating greater than supply
voltage.
R1 -6800 ohms
R2 -3000 ohms
R3 -1000 ohms
R4 -300 ohms
R5- 47,000 ohms

-50 pF
C7 -100 pF
F
C2
C3 -0.27 4F
C4, C5 -0.047 pF
C6 -0.033 pF
C1

-1

IC1- MM5837 (National)

digital noise source (or S2688 from

AMI)

J1' -phono jack (optional)

S1` -SPST switch

-9-volt

battery (optional)
Misc.- battery clip *, 8 -pin IC socket, case.*
The following parts are available from West Side Electronics,
Box 636, Chatsworth, CA 91311.
Complete kit of parts including perforated circuit board,
resistors and capacitors and excluding those marked by an
asterisk, No. PNG -C, $9.95, postpaid.
Complete kit of parts, less battery, silk- screened case, No.
PNG -K, $13.95, postpaid.
Assembled and tested kit, No. PNG -W, $19.95, postpaid.
California residents add state and local taxes as applicable.

BATTY

slider with a pencil on the equalizer and return this control to its
minimum position. Turn up and adjust each control in this
manner. If the microphone frequency response is known, then
the equalizer can be adjusted to this curve and the true response
AUDIO-OUTPUT TRANSISTOR SUBSTITUTE
I need a substitute for the audio- output transistor in a
Sylvania CX2171W. I got a recommended substitute but the base
diagram isn't the same. The base and collector are reversed.

Any ideas?-A.C., Baldwinsville, NY.

In many cases you can cross the legs of a substitute transistor,
being careful to put spaghetti on at least one, and get by.
However, an RCA SK -3103 does have the same basing as the

original.
NARROW RASTER
This Zenith 15Y6C15 has a narrow raster -about half an inch
on each side. The chassis doesn't agree with either of the schematics I have. In the high - voltage adjust circuit, I see what looks
like a VDR. If I shunt the ungrounded side of it to ground with a
100 pF capacitor, I get full width and the grid voltage on the
horizontal output tube goes down from -55 to -45 volts. Are
there any production changes in this chassis ? -A.C., Canadensis, PA.

Yep. This is a late production 15Y6C15 chassis, and the high voltage- regulator circuit is exactly as you described it. I believe

will be flat. Otherwise, the accuracy of the procedure will

depend on the response of the microphone.
When all controls have been set properly, disconnect the unit
and place all sliders in their marked positions. At this point, the
position of the controls marks the flat response setting for the
room. You can now make minor alterations to the response to
suit personal taste or to compensate for deficiencies such as poor
highs from a tape recording.

Some other uses

There are several other uses for pink noise. There have been
claims for the soothing and pain -relieving effects of pink noise
although the extent of this use is questionable. Music synthesizers and recording artists sometimes use pink -noise generators. By using your pink -noise generator and equalizer, you can
create the sounds of wind, rain, surf, etc. In addition, since the
MM5837 is a digital noise source, the pink -noise generator can
be used as a pseudorandom sequence generator.
Room acoustics
Any changes made to the listening area alters the room acoustics. For example, closing the drapes in a large room could
drastically affect system response and necessitate re- equalization. You might consider placing several marks on the equalizer
to account for these varying conditions. You must also remember that the response will be slightly different in different places
in the room. Thus, it is not necessary to set the controls
exactly- dB is sufficient. Finally, on the odd chance your
equalizer controls do not cover equal octave ranges, don't give
up. If the bandwidth of each control is known, you can use this
measurement to determine at what meter level each control
should be set. For example, if the middle control covers one
octave but the low- frequency controls cover '/2 octave, then set
these controls for a reading that is 3 -dB below the reference
R -E
setting.
1

this problem is being caused by that VDR, R110, Zenith part

#63 -7658. The VDR is used as a shunt rectifier fed by a pulse
from the flyback. If the pulse goes up, it causes the grid voltage
of the output tube to be driven more negative, thus reducing the
output. It's obviously overdoing it; try a new one.

SMALL RASTER
A Zenith 13A 16SZ came in with no raster, and the DC voltages
in the horizontal section were all wrong. The flyback had too

much resistance in one winding, so I replaced it-still no raster.

The coupling capacitor between horizontal oscillator and output
was leaky. Now I have a raster but it's small on all sides. This is
usually low B +, but this time it wasn't. Boost voltage reads only
+300 volts. So I'm confused again. -P.N., Houston, TX.
Confused? Welcome to The Club. You've found it; the boost
voltage is far too low. Note that the boost also feeds the verticalinput stage; this would account for the raster being small on all
sides like low B +.
The boost capacitor C68, 0.15 MF, could be open. Try
bridging a new one across it. Since the boost is the plate voltage
R -E
of the horizontal- output stage, it makes the outputs low.

www.americanradiohistory.com

TYPE OF HIT
DISPLAYED
HERE
F

OVER

-FOUL

SCOPE

I. SINGLE
2- DOUBLE
3- TRIPLE
H-HOME RUN

PAYER
PLOVER

^AT BAT

1,01

ALSO
W =WALK

Figure

--

151

0 =OUT

SCORE

I
1101

AHD
INNING NO
OUTS

STRIKES
BALLS

TOP MARKER

PLAYER A

PLAYER
SCORE

SCORE

X030
TRAJECTORY
IF FIRING KEY
IS HELD DOWN

ATARI'S VIDEO COMPUTER SYSTEM provides color graphics, joystick controls, variable skill levels
and six game cartridges available now. The games available now include Combat, Indy 500, Space
Mission, Video Olympics, Street Racer and Air -Sea Battle. Each game offers 14 to 50 variations. The
Combat game, for example, includes 27 variations such as Bi- Plane, Tank, Pong and Jet Fighter.

050
TRAJECTORY
IF FIRING KEY
IS RELEASED

LAUNCHER

LAUNCHER
A

ENEMY
SPACESHIP

ACTUAL SCREEN PATTERNS of two of the RCA

Studio Il games. Baseball is at the top and one
of the two Spacewar games at the bottom.
Other games are available and the basic unit
has four built -in games.

Programmable
TV Games
QUICK DRAW
130

35

ROAD RACE

TENNIS

COLECO TELSTAR ARCADE otters three sets of controls and accessories plus plug -in game
cartridges. Seventeen different games are provided by the cartridges now available. More will follow.

Screen patterns appear in

fu!!1

color on

color TV.

46

www.americanradiohistory.com

RCA STUDIO II is shown above Calculator -type

keyboards are used to play the games. A variety of
cartridges are available now.

to

FAIRCHILD'S VIDEO ENTERTAINMENT S'STEM was the fist programmable unit to appear. It uses
Videocart cartridges to set up the games. Current games include Tic- Tac-Toe, Desert Fox, Spitfire,
Black Jack, Baseball and Space War.Oth3rs are on the way

Games like the six shown here

are competing with TV broadcasting
for your viewing time. Not only
will you have fun playing the games
but they may lead to better TV
viewing too

BALLY'S LIBRARY COMPUTER takes the pros rammablegames concept and adds a
calculator that prints out on tie TV screen making the u id functional as well as
entertaining. Also to come is an add -on fha tiros the u.0 irto a home computer.

APF'S M -1000 MICROPROCESSOR shown at the right includes both

keyboard and joystick controls. Cartridges for both games and educefloral purposes are available.

47

www.americanradiohistory.com

CB

uncommon
Crcuits
For Common Promo m S
An in -depth look at several novel transceiver
circuits developed to conquer the
problems associated with CB communications.
ROBERT F. SCOTT
TECHNICAL EDITOR
IN THE JULY 1977 ISSUE, WE COVERED
three IF noise blanker circuits used in CB
transceivers. A noise blanker that does

not quite fit into the theoretical mold of

most others is used in Radio Shack's
Realistic One- Hander. As you will recall,
the noise blanker works best on impulse type noise. The basic noise blanker taps
off a portion of the incoming signal close
to the receiver's input circuits -generally
well ahead of the highly selective IF
circuits. Noise peaks are extracted from
the composite input signal and then
shaped and amplified. The shaped noise
pulse is fed to a gate that disrupts the
signal path for the duration of the noise
pulse.
In the One -Hander circuit shown in
Fig. 1, the noise blanker is connected
after the ceramic filter and around the
second IF amplifier. A portion of the
amplified IF signal is taken off at the
secondary of the IF output transformer
and fed to the noise-blank detector diode.
The rectified voltage appearing across
the 560K detector load consists of noise
pulses and the transmitted audio signal.
This signal -plus-noise voltage is amplified and fed through a diode to the base
of the noise -blank switching transistor.
When the noise -blank switch conducts, it
short -circuits the IF signal path to
ground, thus preventing much of the
noise pulses from reaching the AF detector and the following AF amplifiers.

Squelch and AMC

Squelch is essential to CB radio receiver operation since it can eliminate the

annoying background noise that exists in

the absence of a signal. Automatic modulation control (AMC) is an equally important adjunct to the CB transmitter.
When properly adjusted, it limits the AF
modulating signal so that the transmitter

by

AMC diodes D2 and D3 to develop

DC control voltage across the 10K adjustable trimmer (R1). This voltage is
proportional to the level of audio on the
modulated Vu line.
Note that the 22K resistor and the
+13.8V
100 pF

RFC

FROM

120K

455kHz
CERAMIC
FILTER

2ND

[F AMPL

2SC372

27011

10012

)-11.

1000F

2ND

120pF

I.F.
OUTPUT
TRANS

TO AF &
AGC DET

& ANL

LF.
AMPL
2.2K
04

1F

50V

NOISE

BLANK
AMPLIFIER 470K

AGC

NOISE BLANK

04

1.5

DET

1S1555

560K
+13.8V
ION AEC)

1-

FIG.
AUTOMATIC NOISE BLANKER
455 -kHz IF ceramic filter.

circuit in Radio Shack's One -Hander is connected after the

cannot overmodulate and cause splatter type interference on adjacent channels.

Figure 2 shows the essentials of the AMC
and squelch circuits in the Radio Shack
One -Hander.
The signal from the microphone follows a path through the mike amplifier
(Q1) and first driver Q4 to the push -pull
AF output and modulator stage. A part
of the modulated Va voltage is rectified

www.americanradiohistory.com

collector -base impedance of Q2 form a

resistive voltage divider feeding the base
circuit of the first AF driver. The AMC
transistor collector- emitter impedance
acts as the variable element in the voltage
divider. Under normal conditions
where the modulating voltage is not high
enough to cause overmodulation-Q2 is
cut off. Therefore, Q2's internal resistance is very high and the major portion

FR DET

i
1

:82K

+13.8V
01

56p

TO
2ND AF

1F

DRIVE
10K

MIKE
AMPL

1/50V

1NF

150K

0017.

1K

3.3F
25V

SQUELCH
SWITCH

"47Kj
.04

4.7AF
16V
47K

001

50K

Q2

10011
RI
10K

1S1555

DRIVER

10K

.001

AMC

Q1

0.4

1ST
AF

.04

22K

330E2

3.3K
E10K

03

8252

12K

33F
16V

Q3

Q5
1F

SQUELCH
SWITCH

10K

1F

4.7 K

+13.8V
(MODULATED)

02 D3
AMC 0E7

+13.8V
TO RECEIVER
RF AND I.F.

47K

4.7K

< 150K

.001

FROM
F

SQUELCH
30K

68K

FROM

place of the meter. One LED, fed by the

modulated 12.5 -volt line, is the modulation indicator. The other five LED's
connected to the output of a DC amplifier -light progressively as the incoming
signal strength increases.
Figure 3 shows how this scheme is used
in Superscope's Aircommand model CB640. In this application, there are eight
LED's: One, on the extreme left, indicates when power is turned on. The
remaining seven LED's check SWR, indicate transmitter output power and
modulation level and show the strength
of the incoming signal. Figure 4 shows
how the LED's react under different
operating conditions.
When setting up the LED indicators as
an S meter, feed in a 50 -V unmodulated
Channel -19 signal and adjust the 4.7K
trimmer for 6 volts DC at the emitter of
the 2SC1213. The S9 lamp (LED 7)
should light up as the generator output is
raised to 100 V. Reduce the generator's

+13.8V

FROM
AGC AT
2ND I.F. AMPL

+13.5V
(MODULATED)
TO RFAMPL
DRIVER AND
FINAL AMPL

+13.8V

CKTS

FIG.

2- AUTOMATIC MODULATION CONTROL and squelch circuits in

of the signal voltage from the mike

amplifier goes on to driver Q4.
When the modulation level exceeds
90% the control voltage developed by
diodes D2 and D3 is high enough to
break down the Zener diode. The AMC
transistor Q2 conducts and its internal
impedance drops, thus limiting the incoming audio peaks to the point where
the modulation does not exceed 90 %.
When receiving, Va voltage (+13.8 V)
is switched from collector Q1 to the
receiver's RF and IF circuits. The audio
from the AM detector output is fed
through a -11F capacitor and a 10K
resistor to the base of Q4.
The squelch circuit consists of switching transistors Q3 and Q5. For a signal to
pass from the AM detector to the output,
transistor Q3 is cut off while Q5 conducts
and appears as a very low resistance in
series with the emitter resistor of Q4.
Squelch action is controlled by the
AGC voltage level on the second IF
amplifier and by the SQUELCH control
setting. In the absence of an incoming
signal, the SQUELCH control is adjusted
just to the point where Q3 conducts,
turning off Q5. Squelch switch Q5 now
appears as an open circuit in the emitter
return of Q4. Audible background noise
is eliminated by this action.
When a signal is received, the developed AGC voltage at the SQUELCH control balances out the cutoff bias on Q3.
This turns on Q5, which permits Q4 to
pass the incoming audio signal. As soon
as the incoming RF signal drops out, Q3
turns on and Q5 turns off to squelch or
mute the receiver.

Radio Shack's One -Hander.

SWR

BRIDGE

D1

I(

REF

FROM

FINAL

RF AMPL

ANT

aaa

O S WR

CAL

-4

CAL

EWE

1N34

200pF

2K

PWR

iT

47K

_L
SWR

-tivr
56052

CAL

bI0

J1ST MIXER

AUDIO

6.3K

FROM
2ND MIKE

AMPL
+5V
47 K

4.7K

+13.4V

4.7K

01

820 52

+1.7V
+13.4V

1.5K

QP Q// rr fl ,l/ tr Orr rr

7.5V
1K

ON

0 0

LED panel meter

While many transceivers use a moving coil panel meter both to measure incoming signal strength and as a modulation
indicator, E. F. Johnson uses six LED's in

RF
1.5

47052

56052

56052

1K

0
5

47052

27052

r-MOD-1
CALf
0 0 0 0 0

POWER-1
5

SWR

10

S9

+20

INPUT SIGNAL

FIG. 3 -EIGHT LED's in the Superscope model CB-640 indicate SWR, output power, modulation level
and signal strength.

www.americanradiohistory.com

rRF
ON

1.5

10

CAL*-SWR

;10:.
8

INPUT SIGNAL

'

TO RECEIVE
RF AMPL

-irM00-1

POWER

ANTENNA WARNING CKT

100PF

J
O

S9

+20

ADJUST CAL CONTROL TO ILL UM IN ATE

)
+14V

POWER-rMOD-i
5
10 CAL-SWR

O O
4

20K

ILLUMINATES WHEN TRANSMITTER

r-RF
1.5

IS

KEYED

I--

20K

820$2

TO AUDIO &
AGC DETECTORS
S /PRF

METER

220

0 0 0 0
4

METER

IN60

CAL--SWR

10

REGT

-rM00

POWER

+20

S9

455kHz I.F.AMPL

INPUT SIGNALJ

ON

47052

.0047

(MODULATED)

1-RF
1.5

0160

50V
ON

ANT
WARNING

47E2

+20

S9

SIGNAL-I

INPUT

ILLUMINATES WHEN CARRIER

IS

LAMP

MODULATED

rRF
ON

1.5

+12.6V

-rMOD-1
10 CAL- SWR

FIG.

POWER

L-

S8

S4

S6

3V

12V

S8

50V

+20

+20dB ABOVE

S5

57

S9

6V

25V

100V

S9

1000pV

CARRIER STRENGTH

4- VARIOUS

FUNCTIONS can be dis-

played on LED indicators of the Superstope

transceiver. Correct SWR calibration is shown
in a and actual SWR is shown in b. Other functions include output power (c), modulation level (d) and signal strength (a).

output to 0 and the S4 lamp (LED 2)

goes out.
In setting up for the other meter functions, a 50 -ohm dummy load and power
output meter are connected to the transmitter output. The 47K potentiometer is
adjusted until LED 2 is turned off. The
Press-to -Talk switch is pushed, and the
external wattmeter should indicate 3.8
watts as specified. With a 3.8 -watt unmodulated output, the 1K potentiometer
is now adjusted until LED's 2, 3, 4 and 5

CB LACKS SENSITIVITY
A new Cobra CB showed very poor

sensitivity when installed in the car, but

performed perfectly on the bench. I found
out what was going on by accident.
On the bench, the speaker was floating
(an external speaker was used with it). I
left this speaker in the car when testing.
After some time, I discovered that one
side of the car speaker voice coil was
grounded! You guessed it. Whoever had
hooked up the external speaker plug had
also reversed the wires. Since the hot
voice -coil lead went to ground, the receiver apparently had very poor sensitivi-

ty.-S. L.,

Bogalusa, LA.

used to make quite a bit of money

reversing speaker leads in old Ford raI

13.882C

lights indicator lamp at first sign of

abnormal SWR.

SIGNAL

INPUT

5-ANTENNA WARNING circuit in Midland model

are lighted.
Modulate the rig 100% with a -kHz
note to insure that all LED's, including
LED 6 and LED 7, light up.
To check the standing -wave ratio
(SWR), set the switch to the CAL position
and adjust the 2K CAL potentiometer
until all LED's up to the CAL point (LED
6) light up. Throw the switch to the SWR
position to make sure that LED's indicating over a 1.5:1 SWR do not light.
Replace the 50 -ohm dummy load with
a 250 -ohm device that will yield an SWR
of 5:1. Recalibrate the bridge and then
read the SWR. Adjust the 500-ohm
potentiometer in the bridge until LED 4
indicates an SWR of 5:1.
1

FIG.

D1

RFPWR
METER
DET

+20

S9

L!-INPUT SIGNAL-J

5pF

CAL---SWR

10

1K

4.000000
1.5

ON

3pF

270pF

--IrM00-I

1-RF POWER

Antenna warning indicator

A disconnected antenna or a damaged
coaxial cable can cause a very high SWR
that can damage transistors in the output
stage of the transmitter. Many CB rigs
have a built -in SWR meter that is also
used to indicate power output, signal
I haven't run into this problem since
about 1948!

dios.

strength and modulation level. Thus, the

operator may not be aware of trouble in
the antenna until the transmitter's output
stage has been damaged.
The antenna warning circuit in the
Midland model I 3.882C transceiver
lights a 12 -volt warning lamp at the first
sign of an abnormal SWR. Figure 5
shows the circuits, in which lines LI and
L2 are the familiar transmission -line sections of the SWR bridge.
The transistor in the warning circuit
has its base connected to resistive networks that are in turn connected to diodes
Dl and D2 that rectify the forward and
reflected voltages on the transmission
line. The circuit is adjusted so that the
transistor is biased on when the SWR is
high enough to cause damage.
A panel meter indicates RF power
output and incoming- signal strength.
When transmitting, the RF power output
voltage drives the meter. In the receive
mode, the meter gets the rectified output
of the IF stage.
R -E
high voltage etc. Therefore, if these are
normal, the drive pulse is normal. So, the
problem must be in the focus circuitry.

FOCUS RECTIFIER CHECK

Is there a good quick test for solidstate TV focus rectifiers? You can't read
them with an ohmmeter. -C. H., Port Angeles, WA.

Well, there's one quick check for the

focus circuit in older TV sets. If the high
voltage and boost are normal but the
focus voltage is too low, the problem is in
the focus voltage supply. Most often, this
problem is caused by a bad solid -state
rectifier. Normally, the resistors do not
have much effect. Substitution is the
quickest check. The focus rectifier is
driven by the same pulse that drives the

www.americanradiohistory.com

TRANSFORMER REPLACEMENT
Help. We can't locate a replacement
power transformer for this Sanken amplifier in any electronics catalog. -H. W.,
Asheville, NC.
You just haven't been looking in the
right place! Thordarson's Transformer
Replacement Guide lists a great many
lower -voltage transformers.
A Thordarson 23V428, which is an
exact duplicate of the Sanken unit, is 36
volts center -tapped at 2.0 amp. For use
with the full -wave rectifier circuit you
showed, tape off the center tap.

Easy Way tTes

Phono Carttdgei
The phono cartridge and its stylus are often the
weakest link in the hi -fi system. Test records can help
you evaluate your system and keep an eye on its performance.
LEN FELDMAN
CONTRIBUTING HI -FI EDITOR

MOST OF THE MUSIC YOU LISTEN TO OVER

your hi -fi system begins as a series of

modulations or minute wiggles in a record groove. The phono cartridge translates those tiny and often complex modulations into electrical signals that are
amplified and applied to your loudspeakers. If your cartridge is not performing
properly, no amount of compensation applied to the other stereo components can
make things sound right.
While many audio dealers offer audio
clinics to test and check amplifiers, preamplifiers and even FM tuners, few shops
can actually evaluate phono- cartridge
performance. If you own an audio oscillator, an AC VTVM and even the most
basic oscilloscope, there are many amplifier tests you can make. Adding a distortion analyzer further enhances your ability to evaluate the purely electronic elements in your hi -fi system. But what can
you use (other than your own ears that
can often deceive you) to check out
the performance of one of your most
important components, the phono cartridge?
It would be ideal if you could place the
stylus on a piece of test equipment containing a precision transducer. The transducer could then transmit the equivalent
of those groove modulations right into the
cartridge on a carefully controlled basis.
Although some researchers are presently
looking into just such a piece of test
equipment, no such gadget is yet available
for consumer use. The only solution,
then, is to use a specially prepared test

record. In recent years, several high quality test records have been marketed
containing signals that allow you to check
more than just frequency response. For
example, CBS Records has seven test
records; two are ideally suited for home
use and require a minimum of additional
equipment to interpret results properly.
Even if you don't own a scope, you can
hear what's happening as you play the
various record bands.
STR -130 test record
CBS test record No.

STR -130 offers

three bands of spot -frequency announcements followed by individual frequencies,

all recorded using the inverse of the
RIAA playback -equalization curve. This
means that connecting a meter at the
record- output or tape-output terminals of
a preamplifier, amplifier or receiver
should result in a flat response if the
cartridge and preamplifer equalizers are
operating correctly. This test record also
I

*5

WM

LEFT CHANNEL OUTPUT

-10

CHANNEL SEPARATION

-20

11 1H -

3D

-RIGHT CHANNEL
-SIGNAL APPLIED
20kHz

OUTPUT WITH LEFT ONLY-

IkHz

100Hz

10

20kHz

FREQUENCY

FIG.

1- FREQUENCY

RESPONSE of test car-

tridge (left- channel only) was plotted using the

STR -130 test record. Lower plot shows crosstalk.

contains continuous sweep frequencies

for use with graphic plotters. However, if
you don't own such automated equipment
(and how many home hi -fi buffs do ?) you
can still plot an accurate point -by -point
response curve. Twenty -nine separate
frequencies are announced and played,
ranging from 20,000 Hz down to
20 Hz in approximately third -octave increments.
Figure shows a response curve that
was plotted using a high-quality phono
cartridge. We set the 1,000-Hz level as an
arbitrary 0 -dB point (the -kHz test tone
is presented first) and based the rest of
the response curve about that point.
Don't be too surprised if you obtain the
same kind of resonant peak at the high
end as we did with our sample cartridge.
Every phono cartridge has some resonant
point up near the high end of the audible
range. If there is an inordinately high
"peak" in the response curve, this could
mean that the cartridge is not being
loaded properly.
Magnetic cartridges require a fixed load resistance (usually 47,000 ohms)
and a fixed capacitance across the output
terminals. Most of this capacitance is
provided by the shielded audio cables
connected between the turntable's output
terminals and the phono -input terminals
on the amplifier or receiver. Many manufacturers specify the optimum capacitance that should appear across the phono
cartridge, but few audiophiles pay much
attention to this specification. In the case
of most magnetic cartridges, as much as
1

51

www.americanradiohistory.com

At CIE,you get
electronics

career
training

from

specialists.
If you're interested in learning how to fix air
conditioners, service cars or install heating
systems - talk to some other school. But if
you're serious about electronics, come to
CIE -The Electronics Specialists.

Special Projects Director

Cleveland Institute of Electronics

www.americanradiohistory.com

y father always told me

that

there were certain advantages to putting all your eggs in one

basket. "John," he said, "learn to
do one important thing better than
anyone else, and you'll always be
in demand."
I believe he was right. Today is
the age of specialization. And I
think that's a very good thing.
Consider doctors. You wouldn't
expect your family doctor to perform
open heart surgery or your dentist to
set a broken bone, either. Would you?
For these things, you'd want a
specialist. And you'd trust him. Because you'd know if he weren't any
good, he'd be out of business.

Why trust your education

and career future to

anything less than a
specialist?

the exams get their Licenses. You

may already know that an FCC
License is needed for some careers
in electronics and it can be a
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Plus there's a professional quality

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"see" and "read" the characteristic
waveform patterns of electronic
equipment.

Find out more: Mail this

card for your FREE
CATALOG today:

You work with experi-

enced specialists.

When you send us a completed

lesson, you can be sure it will be
reviewed and graded by a trained
electronics instructor, backed by a
team of technical specialists. If you
need specialized help, you get it fast
... in writing from the faculty specialists best qualified to handle
your question.

If the card is gone, cut out and

mail the coupon.
I'll send you a copy of CIE's
FREE school catalog, along with a
complete package of independent
home study information.
For your convenience, I'll try to
arrange for a CIE representative to
contact you to answer any questions
you may have.
Remember, if you are serious
about learning electronics ... or
building upon your present skills,
your best bet is to go with the electronics specialists -CIE. Mail the
card or coupon today or write CIE
(and mention the name and date of
this magazine ), 1776 East 17th
Street, Cleveland, Ohio 44114.

People who have known

us a long time, think of us
as the "FCC License
School."

You shouldn't. And you certainly

don't have to.
FACT: CIE is the largest inde-

pendent home study school in the

world that specializes exclusively
in electronics.
We have to be good at it because
we put all our eggs in one basket:
electronics. If we hadn't done a good

We don't mind. We have a fine

record of preparing people to take ..
and pass ... the government administered FCC License exams.
In fact, in continuing surveys nearly
4 out of 5 of our graduates who take

job, we'd have closed our doors

long ago.

Specialists aren't for

everyone.

I'll tell it to you straight. If you

think electronics would make a nice
hobby, check with other schools.
But if you think you have the
cool and want the training it takes
-to make sure that a sound blackout
during a prime time TV show will be
corrected in seconds - then answer
this ad. You'll probably find CIE has
a course that's just right for you!

At CIE, we combine
theory and practice. You
learn the best of both.

Learning electronics is a lot

more than memorizing a laundry list
of facts about circuits and transistors. Electronics is interesting because it's based on some fairly recent
scientific discoveries. It's built on
ideas. So, look for a program that
starts with ideas and builds
on them.
That's what happens with CIE's
Auto -Programmed Lessons. Each
lesson uses world- famous
"programmed learning" methods to
teach you important principles. You
explore them, master them completely ... before you start to
apply them!
But beyond theory, some of our
courses come fully equipped with
the electronics gear to actually let
you perform hundreds of checking,
testing and analyzing projects.
In fact, depending on the course
you take, you'll do most of the basic
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things like servicing a beauty of a
Zenith color TV set ... or studying a
variety of screen display patterns
with the help of a color bar generator.

-- _- - - - -

Patterns shown on TV and oscilloscope screens are simulated.

1___-I CIE

MI
Cleveland Institute of Electronics, Inc.
OM NM

1776 East 17th Street, Cleveland, Ohio 44114

Accredited Member National Home Study Council

YES . John, I want to learn from the specialists in electronics -CIE.

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-I

200 to 400 pF of capacitance may be

required to "tame" that upper response
peak. Using the STR -130 test record, you
can easily experiment and add fixed

capacitance values (small capacitors

are best wired across the phono -input
jacks) until the high -end response is
as smooth as the rest of the curve shown
in Fig. 1.

Figure

2 shows

what happens to the

100

,I-

1111pF
50o
pF
lU

10

2-

ly high increments. Both lateral and vertical bands begin at a +6 -dB level relative
to 11.2 m, which is equivalent to the 0dB music level at 300 Hz (the frequency
used in these bands). Lateral bands

increase to +18 dB, while vertical

bands increase to +12 dB, the maximum
modulation encountered on music
records.
To use these bands, begin with the +6dB signal and determine if mistracking
occurs on this or subsequent higher levels
by listening or by observing the waveform
on an oscilloscope. In our tests, we used a
storage scope to display successively
higher modulation levels of the 300 -Hz
signal in 3 -dB steps. The results are

20kHz

FREQUENCY

HIGH -FREQUENCY RESPONSE depends on the amount of capacitance across the

output of the cartridge.
FIG.

high-end response as different capacitance values are added. In checking results of added capacitance, you can save
time by stopping the "spot frequency
announcements" at around 5,000 Hz (the
frequencies begin at 20,000 Hz and decrease gradually).
The STR-130 record is called the
RIAA System Response Test record. The
rear panel of the record jacket describes
the record contents and use, and contains
a table that indicates the exact amount of
boost or cut required at different frequencies in the RIAA record or playback
curve.
Remember, during the frequency response tests, you will be measuring the
combination of the record's output as well
as the RIAA playback characteristic built
into the preamplifier section of your amplifier or receiver. If you suspect that the
RIAA equalization in your amplifier or
receiver is not quite right, you can check
it by feeding signals from an audio oscillator directly into the phono inputs, plotting the response curve obtained and
comparing it with the curve and values
presented on the back cover of the STR130 test record. Even a -dB or 2 -dB
deviation from the correct RIAA equalization at the frequency extremes can
audibly "color" the music.

3-

FIG.
SINEWAVE SIGNALS are used on the
STR -112 test record for the trackability tests.
Starting at the top of the scope screen, each

successive trace indicates a higher modulation

level. Mistracking is evident in the lowest
trace.

-a

FIG. 4 -IM DISTORTION is evaluated using a

mixture of high- and low- frequency sinewaves.

Starting at the top of the scope screen, each
successive trace indicates a higher stylus velocity modulation level. IM distortion is evident
in lowest trace.

TTR -103 test record

Shure Bros., Inc., has done quite a bit

1.25 GRAM TRACKING FORCE

+8

+9

+12

+18

+15

RELATIVE MODULATOR LEVEL-dR

IRE: 0 -dt MUSIC LEVEL)

FIG.

5- INCREASED

more careful antiskating adjustment

could have cleaned up the output waveforms. Note that while the IM distortion
percentage rises rapidly for this sample
cartridge at a 1.0-gram downward tracking force (see Fig. 5), increasing the
downward force to 1.25 (still within the
recommended tracking force range for
this particular cartridge) improves the
IM distortion considerably.

GRAM

TRACKING FORCE

STR-112 test record

Frequency response is just one of several cartridge characteristics you should

be concerned with. Another CBS test
record No. STR-112 provides signals for
more sophisticated testing. Among other
things, the record contains a series of
"tracking" bands with high -level lateral
and vertical modulations. Remember,
when a phono pickup traces the grooves
of a stereo record, the stylus must move
both laterally and vertically. The bands
on the STR -112 record contain sinewave
modulation levels recorded in increasing-

shown in Fig. 3; the lower modulation

level is shown at the top of the screen and
the successively higher levels are displayed below. The test cartridge performed well at +6, +9, and +12 dB,
began to show some distortion at +15 dB
and exhibited a great deal of distortion at
+18 dB (lower trace). Often adjusting
the tracking force to a somewhat higher
value (all tests were conducted at a 1.0gram downward force) and readjusting
the antiskating force control contained on
some better turntable systems allows
tracking at higher levels (up to +18 dB
with a good cartridge).
Other STR -112 test bands permit you
to evaluate the amount of intermodulation (IM) distortion produced by your
cartridge at different modulation levels.
First, a 4,000 -Hz modulation level is
presented for reference. Then, 400 Hz is
added to this tone, with increasing amplitude. In another set of bands, 200 Hz is
used as the low- frequency component of
the combination test signal. The low frequency component is increased in
3 -dB steps until it attains a peak that is 18
dB above a nominal 5 centimeters-per second stylus velocity. In general, amplitudes of this magnitude are seldom
encountered during actual music reproduction. The combination of tones can be
applied to the input of an IM distortion
meter, observed on an oscilloscope, or
even listened to. The increased IM distortion will be apparent even to an untrained
listener when it begins to occur in significant amounts.
Figure 4 shows successively higher and
higher outputs of this combination test
tone. Note that in the bottom trace (and
even, to some degree, in the trace just
above it), the high- frequency component
has been clipped on the negative -going
peak of the composite waveform
clear
indication of increased IM distortion.
Again, a slightly higher tracking force or

TRACKING

FORCE re-

duces IM distortion at higher modulation levels.

However, increased record wear will also result.

56

www.americanradiohistory.com

of research into cartridge measurement

techniques, and have produced test record No. TTR-103. The record is designed primarily to be used with a specialized
piece of Shure test equipment available
only to Shure dealers. However, much
can be learned about a cartridge simply
by listening to the record or by observing
the output of a suitable preamplifier on
an oscilloscope.
The TTR -103 test record checks track ability (the ability of the cartridge and

stylus to accurately trace great groove

modulations) for three frequency ranges:
low, medium and high. For the high frequency tests, a 10.8 -kHz burst signal
with a 270 -Hz repetition rate is used.
Maximum peak velocity that the stylus
will have to trace begins at 15 centimeters -per- second and increases first to
19 centimeters -per- second, then 24 centimeters -per- second and finally 30 centimeters -per- second. Figure 6 shows the
outputs observed during this high -fre-

6-

FIG.
HIGH- FREQUENCY TRACKABILITY
TEST on TTR -103 test record consists of burst
signals. Starting at the top of the scope screen,
each successive trace indicates a higher stylus
velocity. Lowest trace (stylus velocity of 30 cmper- second) shows mistracking in the form of
waveform clipping.

quency trackability test, with the lower

velocities at the top, and higher velocities
in succeeding lower sweeps. The tests
showed little or no distortion at velocities
of 15 and 19 centimeters -per- second;
some distortion appeared at the 24 centimeters -per- second velocity and, finally,
considerable distortion appeared as the
velocity was increased to 30 centimeters per- second.
The medium- frequency trackability
test signal contained in the Shure TTR103 test record bands consists of a mixture of equal -amplitude 1,000 -Hz and
RCA home videotape recorder

records up to four hours

A suggested retail price of $1000 has

been set by RCA for its new four -hour,

home videotape recorder. This figure is

about $300 less than the suggested retail
prices of the Sony and Zenith two -hour
cassette systems.
Matsushita of Japan, which makes the
videotape recorder for RCA, has its own
VHS system it plans to market in the U.S.
under its Panasonic label later this year,
but declined comment on price and date of
entry into the videotape market. Sony and
Zenith, at this writing, were not planning
any price change.
At least 15 U.S. and Japanese companies have gone on record stating they plan
to make videotape recorders using either
the Betamax (Sony) or VHS formats; the
problem now is whether Sony or Matsushita can supply them with enough units to
keep up with the demand. Sony expects to
produce about 30,000 units per month (half
for the U.S. market), and although Matsushita has yet to get into full swing, RCA
division marketing vice president Jack
Sauter predicts that his industry's sales of

1,500 -Hz signals. As the cartridge begins

to mistrack, sum and difference components (500 Hz and 2,500 Hz) will appear
if a spectrum analyzer or wave analyzer is
used. However, even if the results are
observed on an oscilloscope or listened to
carefully, it is easy to know when midfrequency mistracking occurs. Maximum
velocities of stylus travel required by
these test bands begin at 20 centimeters per- second and increase to 25 centimeters -per-second, 31.5 centimeters -per -se-

7-

MIDFREQUENCY TRACKABILITY TEST

on TTR -103 test record consists of a mixture of
FIG.

high- and low- frequency sinewaves. Mistracking is evident in lowest trace in the form of
waveform distortion. Lowest trace corresponds
to highest stylus velocity (30 cm -per- second).

tond and, finally, to 40 centimeters-per second. Figure 7 shows that the sample
cartridge did pretty well for the 20 and 25
centimeters -per- second velocities, began
to have problems at a peak velocity of
31.5 centimeters -per- second and really
"fell apart" when at a peak velocity of 40
centimeters -per- second.
The low- frequency trackability tests
provided by the TTR -103 test record are
almost identical to the IM distortion tests
supplied in the CBS STR -112 test record, in that 400 -Hz and 4,000 -Hz combined signals are used to test the cartridge. In the case of the Shure test
recorders would reach 250,000 at the end
of 1977 and 750,000 by 1978.
In comparing the VHS system with the
Sony Betamax system, RCA stressed the
former's smaller size, lighter weight and
more energy -efficient mode of operation.
To make a four -hour recording, the RCA
tape drive unit spins at 1.67 centimeters per- second, or half the speed provided by
the two -hour recording capability also contained in the system. The reason for providing two speeds, explains David E. Daly,
RCA division vice president, is to afford
compatibility between VHS recorders. In
other words, any two -hour cassette recorded on your neighbor's machine can be
played on your VHS unit. Such flexibility is
not true for a four-hour recording which
must be played back on the same machine.
You can attach the RCA unit to the
antenna leads of any TV set to make color
recordings off the air or with a camera. The
machine can play prerecorded tapes; record one program while you watch another;
and when used with a timer, can even
record without anyone having to be in the

room.

record, however, stylus peak velocities are

defined in centimeters -per- second and
range from peak velocities of 15 centimeters -per- second to 30 centimeters-persecond. Figure 8 shows trackability problems at a peak velocity of 24 centimeters per- second (the third trace from the top
of the scope face), and when the stylus
tried to trace this composite signal at a
peak velocity of 30 centimeters-per second, trackability problems became
pronounced.

8-

FIG.
LOW -FREQUENCY TRACKABILITY
TEST on TTR -103 test record. Mistracking is
evident in lowest trace. Lowest trace corresponds to highest stylus velocity (30 cm -per-

second).

The few test records discussed in this

article (as well as others) are very useful
in evaluating phono- cartridge performance and, more important, can guide
you in your attempts to adjust your turntable for best possible performance. However, if a cartridge is very old and does
not represent the state -of- the -art, no
amount of adjustment or tracking force
increase may clean up the distorted waveforms. It is also possible that a cartridge
can be good, but mounted in a tone arm
that is not compatible with it. In that
case, there is only one possible solution:
shop for a new cartridge, a new turntable
R -E
system, or both.

TV
SERVICE

'6S:72:4

4Y D

u5

"With coffee so high it's seldom I'm

even though a cup or
offered any .
two makes me work much faster & more
efficiently!"
.

>

z
c
D

57
www.americanradiohistory.com

Radio-Electronics

Tests
Dual C -939 Cassette Deck
CIRCLE 109 ON FREE INFORMATION CARD

LEN FELDMAN
CONTRIBUTING HI -FI EDITOR
IF YOU BELIEVE THAT THE CASSETTE DECK HAS

been perfected to its ultimate state, you will be

surprised to learn that Dual, known for their
precision line of record players, has managed
to come up with a few operating features and
performance capabilities in their new model
C-939 cassette deck that raises the level of that
once lowly recording format yet another
notch. Bidirectional playback, the ability to
record in either direction and even continuous
cassette play are not unique to this machine,
having been featured in Dual's earlier auto reverse deck and in other competitive cassette
models over the past few years. But Dual's
execution of these intricate capabilities, plus
some other new features of the model C -939,
put it into a class by itself.
Figure shows the front panel with both its
conventional and unusual controls. A three digit counter and reset pushbutton are accompanied by a rewind -MEMORY pushbutton to
the left of the cassette compartment. The
cassette door is smoothly and slowly opened by
depressing the EJECT button that also turns off
the machine. Cassettes are easily inserted in
guides on the cassette door itself, for error -free
positioning. Keyboard pushbuttons along the
lower edge of the front panel handle STOP,
CONTinuous, RECORD, fast rewind, reverse
play /record, forward play /record, fast forward and PAUSE functions. The normal speed
(forward or reverse) pushbuttons do not remain depressed when selected, so that the
automatic reversing action that takes place at
the end of play (if selected) does not pop up
either of these keys. The PAUSE pushbutton
can be used to preset all level controls before
the recording begins.
Three round pushbuttons along the lower
right of the panel select either Fe, Cr or FeCr
while simultaneously applying the correct bias
and equalization for the tape used. Three
pushbuttons to the right of the tape selectors
activate the Dolby circuitry, select Dolby FM
1

(for recording or decoding Dolby FM broadcasts, including compensation for the required
25 -ms de- emphasis), and a LIMITER circuit.
Microphone input jacks and a phone jack are
also located along the lower right -hand portion
of the front panel. Separate slide -type level
controls for the left- and right-channel line
inputs and microphone inputs are located at
the center right of the panel. To the left of
these controls are two pairs of output -level and
Dolby-calibration controls; all four controls
are recessed almost to panel- surface level,
since they are considered to be one -time or
seldom -used adjustments that should not be
accidentally miscalibrated.
Heaphone output -level controls are slightly
more elevated from the front panel (what a
convenience having separate level controls for
main and headphone outputs). Two small
rotary controls handle Dual's unique fade-edit
feature -the left control is a spring -retained
knob which, when rotated against the force of
the retaining spring, can be pressed downward
into the panel. This releases an erase head that
can then be used to selectively fade out or
eliminate specific portions of a recorded program. The level of fade or erasure is determined by the second rotary knob to the
right.
Perhaps the most unique section of the
control panel is the tiltable platform at the
upper right. Since the model C-939 can be
operated horizontally, vertically (even
mounted on a wall with hardware supplied), or
at a tilt -up angle (with brackets supplied), this
platform (which contains the record indicators) can also be tilted for best viewing.
Instead of conventional VU meters (or even
VU meters augmented by a single peak-indicating LED), the entire metering system consists of tiny LED's (seven green and five red
LED's per channel). The LED's are calibrated
from -20 dB to +5 dB. Furthermore, the
LED banks can be switched to either peak or
VU (average) indications by means of a slide
switch located below the indicator rows.

The tiltable platform also contains lights

that show which direction the tape is traveling
(necessary in a two- direction deck), a Dolby
indicator light and a light that indicates the
record mode. All these valuable indicating
devices are contained in a surface area no
larger than 6 X 2 inches. This LED arrangement solves the problem of adequate dynamic
range in cassette recordings, and a user need
no longer be concerned with the so-called
"ballistics" of this or that meter, the nature of
the music being recorded and so forth. In fact,
with this sort of level- indicating device, Dual
could easily have omitted the limiter circuit
that is intended only be used in live recording
situations in which an operator might not be
able to control overly high instantaneous levels
produced by poor mike technique.

Construction and circuit details

The two capstans of the model C-939 are
driven by a synchronous continuous -pole motor that is elastically suspended and independent of voltage, temperature and load variations. A precision flat belt drives the capstans
while the tape take -up reel is driven by a
second belt directly from the motor. Fast wind
uses a different, gear-drive system.
Electronic amplifiers and other circuits are
constructed on plug -in modules for easy servicing. A hard Permalloy 4 -track record/

10

i'::
20

Frequency Response: Ferric, 20 Hz to 16 kHz; Cr02, 20 Hz to 17 kHz; FeCr, 20 Hz to 17

kHz (no tolerances given). Wow- and -Flutter: 0.05% WRMS. Signal-to -Noise Ratio:
Ferric, 63 dB with Dolby; Cr02, 63 dB with Dolby; FeCr, 65 dB with Dolby. Total
Harmonic Distortion: Less than 1.0% at 0 VU record level. Erasure: 70 dB. Fast Wind
Time: 60 seconds for C -60 cassette. Bias Frequency: 80 kHz. Input Sensitivity: Mike,
0.3 mV; line, 70 mV. Output Level: 0 to 700 mV (variable). Dimensions: 17.3 W X 5.9 H
X 11.8- inches D. Suggested Retail Price: $550.

100

kHz

Hz

20

kHz kHz

FREQUENCY

'

MANUFACTURER'S PUBLISHED SPECIFICATIONS:

-20 dB RECORD LEVEL

1-

-10

> -20

,,...-..-/.'1

-30

20
Hz

100

kHz

20

kHz kHz

FREQUENCY

www.americanradiohistory.com

TABLE

playback head is used along with two erase

heads (necessary because of the bidirectional
tape handling facilities).

Manufacturer: Duel (United Audio)

Model: C -939

CASSETTE TAPE DECK MEASUREMENTS

R -E

R -E

FREQUENCY RESPONSE MEASUREMENTS

Frequency response, standard tape (Hz-kHz dB)
Frequency response, CRO2 tape (Hz- kHz dB)
Frequency response, other (see text) Hz-kHz dB

MEASUREMENTS

EVALUATION
Very good
Good

DISTORTION MEASUREMENTS (RECORD /PLAY)

Harmonic distortion at -3 VU (1 kHz) (%)
Harmonic distortion at 0 VU (1 kHz) ( %)
Harmonic distortion at +3 VU (1 kHz) ( %)
Record level for 3% THD (dB)

UD-XL-1 UD-XL-II
1.0 0.75
1.0 0.85

30 -15, 3.0
20 -14.5, 3.0

See Figs. 2,3

1.1

1.1

+10

+7.0

Excellent
Excellent
Superb
Superb

SIGNAL -TO -NOISE RATIO MEASUREMENTS

58
67
60
69

Excellent
Excellent
Superb
Superb

MECHANICAL PERFORMANCE MEASUREMENTS

Wow- and -flutter ( %, WRMS)
Fast wind and rewind time, C -60 (seconds)

0.04
45

Very good

COMPONENT MATCHING CHARACTERISTICS

Microphone input sensitivity (mV)
Line input sensitivity (mV)
Line output level (mV)
Phone output level (mV)
Bias frequency (kHz)

0.3
73.0
650
1350
80

Standard tape, Dolby off (dB)

Standard tape, Dolby on (dB)
Cr02 tape, Dolby off (dB)
Cr02 tape, Dolby on (dB)

TRANSPORT MECHANISM EVALUATION

Action of transport controls
Absence of mechanical noise
Tape head accessibility
Construction and internal layout
Evaluation of extra features, if any

Superb

Superb
Excellent
Very good
Excellent
Superb

CONTROL EVALUATION
Level indicator(s)
Level control action
Adequacy of controls
Evaluation of extra controls

Excellent
Excellent

OVERALL TAPE DECK PERFORMANCE RATING

Excellent

Superb
Good

TABLE II
Manufacturer: Dual (United Audio)

Model: C -939

OVERALL PRODUCT ANALYSIS

Retail price
Price category
Price /performance ratio
Styling and appearance
Sound quality
Mechanical performance

$550

Medium -high
Excellent
Excellent
Very good
Excellent

Comments: Perhaps the most impressive feature of the Dual model C -939 cassette deck is the
multiple LED arrangement used to indicate record and playback levels. Much more
precise than even some of the better record level meters used on high -priced cassette
decks, the calibrated LED arrangement really insures against over recording, and yet
allows the user to take fullest advantage of the dynamic range available on cassette
tapes. The auto -reverse feature (ability to play in both directions without turning over
the cassette and the ability to record in either direction) has a smooth action and a
totally reliable tape azimuth alignment. The dual- capstan drive is positive and consistent, making the system less subject to variations. The fade -edit feature enables you to
erase preselected portions of a recording after the recording has been made and
permits professional fading effects to be added later- without the user having to act
as a real -time recording engineer. While the frequency- response capability is not as
great as higher -priced decks, it is adequate, and, more important, the low wow -andflutter specs permit a recording that approximates that possible with 71/2- inch -persecond open -reel decks.
Dual has created a logical and thoughtful balance between frequency response,
distortion and signal -to -noise capability. Not too long ago, a signal -to -noise ratio of 60
dB (without Dolby) would have been considered a dream when it comes to cassette
performance. Yet, that figure was actually measured using Maxell UD -XL -II tape (for
which the machine seems ideally calibrated, when the Cr02 tape switch is activated).
This new entry from Dual must be seen and tried to truly appreciate it.

www.americanradiohistory.com

Laboratory measurements
Results of our lab measurements are listed
in Table I and can be compared with the
manufacturer's published specifications listed
in this report. Frequency response, using a
sample of Maxell UD -XL -I tape, is shown in
Fig. 2, and Fig. 3 shows similar measurements
for a sample of Maxell UD -XL -II tape. The
latter tape sample requires the Cr02 tapeselection setting, while the UD -XL -I tape was
tested by pressing the Fe tape pushbutton. It is
difficult to compare Dual's frequency -response claims with our results because the
manufacturer's specification fails to indicate a
tolerance ( dB value). Although the results
may not be as impressive as those claimed
(and achieved) by higher -priced competitive
units, frequency response is only one performance criterion. Our summary comments together with overall product evaluation are
shown in more detail in Table II.
The double- capstan and motor /belt drive
arrangement is successful in terms of tape
transport uniformity as evidenced by the extremely low wow- and -flutter figure (0.04%
WRMS) obtained in our lab measurements.
Even unweighted, the wow- and -flutter was
only 0.08 %. Note that the various signal -tonoise ratios shown in Table I are all unweighted figures.

Use tests
The full flexibility of the model C -939 can
only be appreciated through a hands -on session with the machine. For example, when we
made our frequency-response checks at the
usual -20 dB record level, it was gratifying to
observe that the green LED level indicator
labeled " -20 dB" lights up (with no others
illuminated), which attests to the extreme
accuracy of the LED level indicators. Transition from forward play to reverse play is
smooth and noise-free, and it is possible to
reverse the direction of play without first
depressing the STOP button. At end of tape
travel (in either direction), the transport not
only comes to a stop (and the capstans are
disengaged), but power to the entire deck is
real boon to the
automatically shut off
forgetful operator. In short, Dual seems to
have thought of everything that many other
manufacturers have overlooked. Superlatively
low distortion, high signal -to -noise ratios,
smooth tape transport action and adequate
bandwidth all contribute to a cassette deck
that would fit in nicely with the very best high R -E
fidelity component systems.

-a

Sansui AU -717 Amplifier

CIRCLE 110 ON FREE INFORMATION CARD
THE INTEGRATED AMPLIFIER HAS BEEN CHAR -

acterized as being "midway between a receiver

and separates." This category seems to imply
that an integrated amplifier is not quite as
flexible or as high in performance capability as
a separate basic amplifier preceded by .a
preamplifier- control unit. In the past this was
generally true, but now there is a group of
integrated amplifiers that offer as much circuitry sophistication and control flexibility as
any two -piece amplifying system. Typical of
this new breed is Sansui's impressive model
AU-717, a moderately priced, relatively highpowered unit.
At the lower left of the black front panel
(see Fig. 1) is a POWER on -off lever switch and,
directly above it, an indicator light that flashes
for a few seconds immediately after turn -on,
until circuits have stabilized and the audio
outputs have been connected to the speaker
terminals. The light also flashes a warning
whenever the built -in protection circuits are
activated. The SPEAKER switch selects either or
both sets of speakers connected to the unit.
Step-type BASS and TREBLE controls, mounted
one above the other, are augmented by pushbuttons that determine crossover points -400
Hz or 200 Hz for bass, 6 kHz or 3 kHz for
treble. Four switches at the lower center of the
panel come next. These switches handle tone
defeat, subsonic- and high -cut filter switching

nected (or separated) by a slide switch that is

locked in the connected mode to prevent the
inadvertent disconnection between the preamplifier and amplifier unless done so deliberately for bi- amplification or to interpose some
accessory device between these two circuit
points. The usual array of tape -input and tape output jacks plus a chassis ground terminal
and a line fuseholder complete the rear -panel
layout. The rear panel is shown in Fig. 2.

limiting factor and that determines the FTC

power rating of the unit, since 86 watts was
obtained at a 0.025% rated distortion for this
frequency
a bit higher than the 85 watts
claimed. Although Sansui does not provide a
power rating for 4 -ohm loads, we measured
the amplifier's power capability with 4 -ohm
loads connected, and again the power- output
limitation was observed at the high- frequency
extremes, with readings of 94 watts for 0.025%

just

and loudness.
A large dB- calibrated step -type VOLUME
control dominates the panel and is located
above a much smaller channel -balance control

knob. To the right of this control knob is an

audio MUTING switch that lowers the listening
level by a fixed 20 dB. Three vertically
arranged interlocking pushbuttons select
SOURCE, TAPE I or TAPE 2; a rotary tape COPY
switch used with the tape pushbuttons can
select dubbing from either tape deck to the
other, tuner dubbing, source, or an off position
that disconnects both tape -output jacks when
taping is not desired. At the upper right -hand
side of the panel is a program SELECTOR switch
with two PHONO positions and settings for
TUNER or AUX.
The rear panel of the model AU-717 contains the usual banks of speaker terminals.
These terminals are spring -loaded for the easy
insertion of stripped speaker wires. One
switched and two unswitched AC convenience
receptacles are located near the speaker terminals. To the left are the preamplifier- output/
main amplifier -input jacks that are intercon-

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Power measurements
Table I shows our measured results for the
power-amplifier section. One clear advantage
of DC design is apparent. Even at the low 20Hz extreme, the amplifier delivers a full 92
watts-the same value obtained for midfrequency power-compared with its 85 -watt
rating into 8 ohms. In this amplifier, the highfrequency power capability proves to be the

MANUFACTURER'S PUBLISHED SPECIFICATIONS:

Power Output: 85 watts -per -channel continuous powe- 8 ohm loads, 20 Hz to 20 kHz.
Rated Harmonic Distortion: 0.025 %. Rated M Distort ion: 0.025 %. Damping Factor:
approximately 60 at 8 ohms. Frequency Response (Power Amp In): 0 to 200,000 Hz,
-3 dB. Input Sensitivity: phono 1 & 2, 2.5 mV; high level, 150 mV. Phono Response:
RIAA 0.2 dB. Phono Overload: 350 mV. Signal -to -Noise Ratio (A Weighted): phono,
78 dB; high level, 100 dB. Bass Range: 10 c B at 50 I-z. Treble Range:

www.americanradiohistory.com

,i...

---_ 1111n
__.,

TOM FOR

mxf16EN IOGIMv

ROW NMINOR

NI

TABLE

Model AU -717

Manufacturer. Sansui

AMPLIFIER PERFORMANCE MEASUREMENTS

R

92.0
92.0
86.0
118.0
115.0
94
Below 10 -22

DISTORTION MEASUREMENTS
Harmonic distortion at rated output, kHz (%)
Intermodulation distortion, rated output (o)
Harmonic distortion at -watt output. kHz (%)
Intermodulation distortion at -watt output %)
1

DAMPING FACTOR, AT

-E

Measurement

POWER OUTPUT CAPABILITY

RMS power /channel, 8 -ohms, kHz (watts)
RMS power /channel, 8 -ohms, 20 Hz (watts)
RMS power /channel, 8 -ohms, 20 kHz (watts)
RMS power /channel, 4 -ohms, kHz (watts)
RMS power /channel, 4 -ohms, 20 Hz (watts)
RMS power /channel, 4 -ohms. 20 kHz (watts)
Frequency limits for rated output (Hz -kHz)

-E

Good
Good
Very good

55

Excellent

0.1

Superb
Superb
Excellent

380
82 "A"

HIGH LEVEL INPUT MEASUREMENTS

dB)
Frequency response (Hz -kHz.
Hum /noise referred to full output (dB)
Residual hum /noise (minimum volume) (dB)

2.8 -68, 3
93 "A"

93

TONAL COMPENSATION MEASUREMENTS

Action of bass and treble controls
Action of secondary tone controls
Action of low frequency filter(s)
Action of high frequency filter(s)
COMPONENT MATCHING MEASUREMENTS
Input sensitivity, phono /phono 2 (mV)
Input sensitivity, auxiliary input(s) (mV)
Input sensitivity, tape input(s) (mV)
Output level, tape output(s) (mV)
Output level, headphone jack(s) (V or mW)

"A"

Excellent
Very good
Good

See Fig. 5

Excellent

See Fig. 6
See Fig. 6

Excellent
Fair

2.5/2.5

150
150
150
138 mW

EVALUATION OF CONTROLS,
CONSTRUCTION AND DESIGN
Adequacy of program source and monitor switching
Adequacy of input facilities
Arrangement of controls (panel layout)
Action of controls and switches
Design and construction
Ease of servicing

Very good

OVERALL AMPLIFIER PERFORMANCE RATING

Excellent

TABLE

Superb

0.0085
0.025
0.02
0.012

OHMS

PHONO PREAMPLIFIER MEASUREMENTS

Frequency response (RIAA - dB)
Maximum input before overload (mV)
Hum /noise referred to full output (dB)
(at rated input sensitivity)

Evaluation
Very good
Excellent
Good
Not rated
Not rated
Not rated
Excellent

Figure 3 shows the tone -control range. In

this variable- turnover design, the maximum
amount of bass or treble boost and cut remains
virtually the same at the frequency extremes,
regardless of the turnover point selected.
Figure 4 shows that the high-cut filter
action is extremely gentle, and, while Sansui
maintains that this was done in order not to
introduce phase shifts, we found that the highcut filter, in its practical applications, was of
little use; the same degree of cut was obtain-

Excellent
Excellent

Excellent
Superb
Good

II

Model AU -717

Manufacturer. Sansui

OVERALL PRODUCT ANALYSIS

Retail price
Price category
Price /performance ratio
Styling and appearance

Sound quality
Mechanical performance

$450

Medium
Excellent
Excellent
Superb
Very good

Comments: While the emphasis placed on the DC power -amplifier design is certainly justified, we
were even more impressed by the control precision built into the Sansui model AU717. and by its moderate price. Sansui claims that this unit has reduced transient
direct result of the DC design, and, indeed, the model
intermodulation distortion
AU -717 delivered sound as transparent and clean as any we have heard from an
integrated amplifier (and equal to that produced by some of the better basic power
amplifiers). It should be pointed out, however, that only the power -amplifier section is
DC- coupled from input to output, so that the claimed bandwidth (from 0 to 200,000 Hz)
is somewhat meaningless when all program- source inputs must first travel through the
non -DC preamplifier and control sections. The filters are a mixed bag. While the high cut filter has too gradual a slope and begins to cut at too high a frequency (affording no
more noise suppression than is possible with the TREBLE control), the subsonic filter
cuts off at around 16 Hz and effectively reduces subsonic rumble without affecting the
musical bass content at all. The combination of the tape COPY switch plus the separate
TAPE PLAY button arrangement allows you to record FM programs from a connected
tuner even while listening to other programs. The off position of the tape copy switch
prevents the tape decks from interacting with the rest of the system, which is important if the input impedance of your connected tape machines is less than optimum.

-a

www.americanradiohistory.com

able wing the regular TREBLE control. . \[though Fig. 4 does not show the subsonic -filter
action, the subsonic filter in the model AU7/7 effectively removes this unwanted range
of frequencies without affecting musical re-

production.
Figure 5 shows the loudness -control action
at various volume settings, and, in addition,
confirms the extreme accuracy of the calibration marks on the master volume control. Each
vertical division on the scope face represents a
10 -dB amplitude change, and. using only the
front -panel calibrations of 0, -10, -20, -30
and -40 dB, one can see how closely the IkHz center -frequency points on each curve
correspond to the desired loudness levels.

summary
A summary of our reactions to the model
AU-7/7, together with overall comments regarding its quality, is shown in Table II. The
price, power output and performance features
of this new Sansui entry make it worth serious
consideration -even by those who prefer sepaR -E
rate amplifiers and preamplifiers.

the whole team

wondered what Ron Brown

was up to in his basement.
Word has it he was up to something mighty special.
And when he didn't show up for bowling practice one
Wednesday night, the Lucky Strikers (that was the name of
his neighborhood team) began to wonder, too.
So it was that a bunch of the boys
decided to pay their "star" a visit, and talk him
out of his secret project and back into action.
It didn't happen that way, though.
Matter of fact, it was Ron Brown who
talked the Lucky Strikers out of their bowling
night and down into his workshop. What was it
...what could be exciting enough to keep a
bunch of ten -pin tigers from their favorite pastime? One of the most fascinating learn -at -home
programs in the world, that's what!

Actually build and experiment

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You'll set up your own electronics laboratory to discover first -hand the technology
behind the most exciting innovations in the world
of home entertainment electronics.
In fact, as part of the program, you'll
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integrated circuit 100% solid state color TV.
But most important of all will be the
new skills you'll develop all along the way...the
kind of skills that could lead you in exciting new directions.
For example, like many of ASI's 140,000 graduates, once you
complete the program you could use your training:
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2. To start a business of your own
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4. To upgrade your current job
5. As a foundation for advanced programs in electronics

Go exploring at home, in your spare time. No

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ASI wants to make it easy for you to get to know the
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signals and convert them into sound.
VTVM (Vacuum Tube Voltmeter) -Build and
troubleshoot measurements of DC +, DC -, AC
rms and peak -to -peak voltages.
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the heartbeats of tiny integrated circuits with one
of the most universal of all testers. You'll experiment with displays of voltage waveforms found in
audio devices, television receivers, transmitters
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Vectorscope- Patterns for converging, adjusting
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Solid state circuitry and integrated circuits are used
for accuracy, stability and reliability since this will
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servicing color television receivers.
Color Television Set -As you build, you explore
automatic fine tuning, plug-in circuit boards, the
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circuitry used in the late model color receivers.
Besides these, you will also receive a
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and tool box.

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assemble and experiment with the kind of fascinating elecIf card has been removed -write to:
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Signal Generator -This important tool helps you explore
AM alignment and signal injection. This is a source of
101
modulated or unmodulated signals. It provides a wide range

aSi

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advance

www.americanradiohistory.com

hobby corner
Helpful hints, including magnetizing and demagnetizing tools,
tuning a mobile antenna, a simple field strength meter and
more.
EARL "DOC" SAVAGE, K4SDS, HOBBY EDITOR
I'VE BEEN SAVING SEVERAL SHORT, BUT

helpful, items for use in this column when

space permits. Well, the pile is growing
taller, so I thought I'd put together an
entire column based on these short items.
Sort of a helpful hints column. You
should find at least one useful item in the
group. So, on to the first one.

Magnetism and your tools

Sometimes when you need a magnetized screwdriver or other tool (or one
that is not magnetized) it can be very
frustrating when the tool is in the wrong
magnetic state. For example, have you
ever tried to sort out small nuts and bolts
with magnetized tweezers, or adjust a
meter to zero with a magnetized screwdriver?
The other day I took a file from the
pegboard to reshape the end of a pin
punch. After a couple of light passes, I
noticed the file was cutting very unevenly. To my surprise, the file had become
magnetized and the filings were clogging
it up. Thirty seconds later it was working
fine. You, too, can demagnetize (and
magnetize) any steel tool very quickly.

O
cc

U
w
Jw
O

Demagnetizing: To quickly and completely demagnetize any tool you must

use an electromagnet powered by alternating current (AC). Although you can
make your own electromagnet, two different sizes made for the tape recording
fan are readily available. One is a head
demagnetizer that works well with small
tools, and the other is a bulk eraser that
can be used with both small and large
objects.
The demagnetizing process is quite
simple. Turn the eraser on and hold the
tool in the alternating electromagnetic
field. Then, keeping the eraser on, slowly
withdraw the tool until it is a foot or two
away. If this is done properly, the screwdriver or tool will be completely demagnetized.
Magnetizing: Of course, a tool can be
magnetized by stroking it in one direction
with a permanent magnet. However, an
electromagnet is much more effective. A
DC electromagnet would be best but it is
just as easy to use your AC demagnetizer.
Just place the tool in the magnetic field

and turn the magnet off. The tool is

magnetized when the field collapses
around it. However, there is one little
catch to this procedure.
As the AC current constantly changes
from maximum to minimum and back,
the electromagnetic field also changes.
You may find that you cut the electromagnet off when it was at minimum so
that nothing collapsed around the tool! In
this case, the tool will not be magnetized,
which you can check by putting it into a
box of bolts or paper clips.
If the tool wasn't magnetized the first
time around, it only takes a few seconds
to try again. In several tries at most, you
will hit maximum and have a strong
magnet.
Caution: When using a strong electromagnet such as a bulk tape eraser, keep it
away from your VOM and other meters.
It's also a good idea to remove your wristwatch.

Insertion tool

Mobile antenna tuning

Most advice on installing and tuning a
mobile antenna -ham or CB-stresses
the use of an SWR (Standing -Wave
Ratio) meter. Certainly it can be done
this way but the process can get a little
tricky.
It is far more satisfactory to do the
tuning with an FSM (Field Strength
Meter). First, an FSM is much simpler to
construct, and less costly to buy. Second,
you can get the desired results much
easier and quicker with an FSM; it shows
you power radiated from the antenna,
which is what you are interested in.
Figure shows a simple FSM. Construction is straightforward and not at all
critical in terms of part values or placement. Substituting a less sensitive meter
(such as a 0 -to-1 mA meter) will mean
that you must attach a longer antenna
wire to the FSM or place the instrument
1

Now and then a device comes along

that you have always needed. The OK
Machine and Tool Company has developed an IC insertion tool that is different-it has a pin straightener built into
the handle.
FEET

OR 2
of
sTirF
W iMe
I

As is true with almost everything, a

ready -made item costs more than a
home -made one. The PanaVise devices
are no exception, but their convenience
and adaptability are excellent. When a
board, panel or part is inserted, it stays in
place. When you angle the vise in any
direction, it holds that position while you
pull, push and solder.
The PanaVise devices are really handy
since they can hold things lightly or they
can really bear down. So, they can be
used for metal, wood, plastic, glass and
other materials.

y
2.5 MH

ql4

o-100

FIG.

All told, I must have spent days

straightening IC pins with my long -nose
pliers. If each pin isn't just right, the IC
won't go into a socket or board. Now, I
simply pop them into the straightener
and they are ready to go. (However, don't
throw your pliers away-you'll still need
them if the pins are badly mangled.)

Holders updated
A few months ago, we had an article
about homebrew breadboards and part
holders. Since then I have used two
different holders made by PanaVise.

66

www.americanradiohistory.com

1
T ,00

closer to the transmitter antenna, or

both. The FSM can be built inside a
metal, wood or plastic box, or even on a

breadboard.
When tuning the antenna using an
FSM, use the following procedure.
Simulate on- the -road conditions;
i.e., close the doors, get the car
away from trees, roofs, etc.
2. Place the FSM on the outside of
the car so that the meter face is
visible (for instance, on the hood).
If you want to go to the trouble,
you can also place the meter
1.

* FREE!

inside the car and connect the

AM radio antenna in place of the
FSM antenna wire.
3. Switch to your favorite channel
and key the transmitter briefly
while you note the meter reading.
4. Adjust the FSM sensitivity control
and /or its antenna -wire length
(not the CB antenna) to give a
reading of about three -fourths of
full scale.
5. Adjust the CB antenna until the
FSM gives the highest reading.
Just change the antenna length
by loosening the set screw, sliding the movable section in or out,
then retightening the screw. If
lengthening the antenna gives a
lower reading, shorten it and vice
versa. Keep adjusting the antenna until you pass the maximum
reading, then return to it. Make
the adjustments in small steps
with most short loaded antennas,
a small change in length creates a
big change in output.
If you follow the above procedure, your

TA%
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antenna will be tuned for maximum

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continued to page 76

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computer corner
Z -8

Z-80 instruction set and how it compares to

the 8080 instruction set.
WILLIAM BARDEN, JR.

LAST MONTH'S COLUMN DISCUSSED THE

pin -out of the Z -80 IC and the Z -80's

timing. Now let's take a look at the Z80's instruction set.
One of the most confusing things to a
novice microcomputer user is the use of
the instruction set. A simple computer
may be constructed with a set of ten
instructions or so. This basic computer
can perform any operation that a computer with an instruction set of 200

instructions is capable of performing.

Naturally, the program, or set of instructions to perform the function, will be
much longer for the simple computer
than for the 200 -instruction computer.
The 200 -instruction computer offers a
versatile set of instructions from which a
programmer can choose. If the programmer is very familiar with the instruction
set of a computer, he may choose instructions that optimize the program for size
(number of instructions) and speed
(number of instructions to be executed
for a given function).
The Z -80 offers a set of 158 instructions from which the Z -80 programmer
may choose. Many of the instructions are
very powerful. However, many instructions simply are included to achieve compatibility with the 8080 and 8008. Since
some of 8008/8080 types of instructions
do not follow classical instruction lines,
they prove confusing to both novice and
experienced programmer alike.
Z -80 instruction set
The Z -80 instruction set may be
divided into 8 major groups:
1.

2.
3.
4.
5.
6.
7.
8.

cation (200010) were previously loaded

into the H,L and D,E register pairs by two
move type instructions. The number of
bytes to be moved (10010) was also pre loaded into the B,c register pair.
An example of Block Transfer is
shown in Fig. 1.
Arithmetic and Logical instructions
are found in all computers and microprocessors. In the Z -80, all 8 -bit arithmetic
and logical operations use the current A
register (A or A'). A second 8 -bit operand
from another CPU register or external
memory is used in an addition, subtraction, AND, OR, or similar operation with
register A. The results of the operation
are transferred to register A and appropriate flags are set. Certain types of 16bit arithmetic operations are also per knitted, notably additions between CPU register pairs and the H,L register pair (destination). Binary- coded-decimal (BCD)
addition and subtraction can be performed by using the standard addition
and subtraction instructions and executing a special DAA or Decimal Adjust
Instruction that adjusts the results of the
addition or subtraction to BCD format.
Addition example:

OThe

Load and Exchange

Block Transfer and Search
Arithmetic and Logical
Rotate and Shift
fait Manipulation
Jump, Call and Return
Input/Output
CPU Control

The Load and Exchange instructions

move data 8 or 16 bits at a time between
CPU registers or between CPU registers
and external memory including stack.
Many of these types are provided in the
8080. Moving data from memory to CPU
registers is necessary to load the CPU A
register in preparation for arithmetic or
logical operations such as adding two 8bit operands or performing a logical AND
or shift operation. When the operation

has been performed, or after a series of

operations, the CPU register results may
be moved back to memory by the same
type of instruction. Transfers between
CPU registers and memory are also
required in preparation for a "programmed" I/O (Input /Output) operation where an 8 -bit operand is transferred
to or from an I/O device via a CPU register. Eight- or 16 -bit data may also be
moved from one CPU register to another
CPU register, or the contents of two
CPU register pairs may be exchanged. In
all load operations, the source data is
copied to a destination register or memory location. The original data remains
unchanged. All computers have instructions of this type.
Load and Exchange example:
LD A, 1000H

Loads the A register with

the contents of location
100016. Location 1000
remains unchanged. (H
stands for hexadecimal,
or base 16.)

register

If

contains

000010102(1010) and register a contains 010001112(7110), executing ADD

The Block Transfer and Search instructions are very powerful instructions
that few computers and no other current
microprocessors have. With one instruction, the Z -80 can transfer a block of
memory data from one set of locations in
memory to another, or search a block of
memory for a given character. In other
microprocessors, the block transfer or
search would take perhaps six to ten
instructions to implement, with subsequent longer transfer and search times.
The following instruction transfers 100
bytes of data from location 100010 to
location 200010 in the Z -80. The source
location (100010) and the destination lo-

produces:
= 010100012 =

(A)
(B)

of

= 010001112 =
a

8110

(Sum)
(Contents

7170

unchanged)

Rotate and Shift type instructions expand greatly upon the 8080 capabilities.
The 8080 can only rotate the contents of
the A register, or the contents of the A
register and carry bit together, one bit
left or right. The Z -80, however, not only
can perform a rotate shift right or left,
but can also perform arithmetic and logical shifts. In addition, not only can register A be shifted, but any CPU register, or
any memory location. Finally, two BCD

CPU

H,L
100010
O,C

200010
LOIR
INSTRUCTION

B,C

10010

FIG.

www.americanradiohistory.com

digit rotate instructions perform a rotate

of an accumulator BCD digit and two
BCD digits in a memory location.
The Z -80 Bit Manipulation instructions enable the programmer to test,
reset, or set any bit of a CPU register or
any memory location. None of this group
is provided in the 8080. Testing, resetting
and setting bits are common operations
that would take several instructions in
other microprocessors.
Bit Manipulation example:
SET 3,B

Sets bit 3 of CPU register

Holds the address of the

block of data to be output
(100010)

Holds the number of bytes to

be transferred (250,0)

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The Jump, Call and Return instructions include the 8080 unconditional and
conditional jumps, calls and returns. A
jump instruction reroutes program execution to a specified address either unconditionally or conditionally based on
one of the flag bits (carry, no carry, zero,
etc.). A call performs the same jump, but
pushes the return address into the memory stack so that a return may be made by
a return instruction, which pops the
return address from the stack and causes
the program to return to the next instruction following the call. Calls and returns
are used for subroutine operation. A subroutine is any set of instructions that
perform a certain function (square root,
search a table, etc.). In addition to the
8080 instructions in this group, the Z -80
includes jump "relative" instructions,
jump "indexed" and several other types.
The Input /Output group of instructions include the 8080 IN and OUT
instructions. The IN and OUT instructions
enable one byte of data to be transferred
between the A register and an I/O device.
In the Z -80, however, one byte may be
transferred between any CPU register
and an I/O device. Also included are
block input or output instructions that
effect the transfer of up to 256 bytes of
data between any CPU register and the
I/O device.
Input /Output example:
H,L

Alternate
Timebase Display

Holds the address of the I/O

device (5)
Outputs 25010 bytes of data
to I/O device 5, starting at
location 100010

The last group of instructions include

miscellaneous CPU control instructions
to halt the microprocessor, enable and
disable interrupt, perform a "no- operation" instruction and three instructions
(not in the 8080) to set several types of
interrupt modes.
In next month's column, we will examine the different ways in which the Z -80
can address memory locations.
R -E

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Composite triggering in A -B display derives its source from the differential

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This 18.5 Ib. portable is double insulated for measuring convenience and even
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service clinic
Help wanted: A good power transformer!
How to find a replacement transformer without a schematic.
JACK DARR
SERVICE EDITOR
A COMMON QUESTION IN THE CLINIC MAIL -

bag concerns an "orphan," a small- to

medium -sized tuner, stereo, tape player,
etc. The unit name is meaningless, and,
of course, no service data or parts source
are listed. The power transformer will be
bad. For the most part, the primary
winding will be open, probably because
the wire was used that was too small for
the load. At any rate, the question is,
"Where can I get a replacement ?"
Fortunately, there is a test you can use.
Check the DC voltage and the current
drawn. Look at the voltage rating of the
electrolytic filter capacitors. It is easy to

identify the capacitors, the rectifier

diodes and the power transformer in a
unit. By noting the filter -capacitor rating
and polarity, you can get a good idea of
the voltage. With 16 -volt filters, the voltage is probably 12. In fact, most of these
little monsters do use 12 -volt DC power
supplies especially if a tape deck is
included; the decks tend to use 12 -volt
DC motors, the same as in automotive type units. A unit may have a solid-state
regulator or speed control, with the motor actually running on less than 12 volts,
but the supply voltage is what you have to
determine.
In the last letter we received, the
malfunctioning unit was a "Cariole";
there was no listing anywhere, of course.
The transformer apparently had two secondaries, each with a diode rectifier.
Since the unit was a tuner /tape combo,
one supply probably fed the amplifier
and the other the tape -drive motor. You
can verify it with an ohmmeter. To find
the amplifier power supply, trace from
the output transistors back to the filter
capacitors. The output transistors are
also fairly easy to pin down with the
Mark I Calibrated Eyeball by following
the leads back from the speaker.
Now, for the test: Unhook the amplifier DC power supply from the transformer, and connect it to a bench DC
power supply with a variable output voltage. Use a current meter, such as the
TeleMatic Polaris TPS -225, or the
Heathkit /P-2718. Set the voltage output
to 0, and unit switch to AM or FM.
Adjust the volume control very low. If

the unit has a common supply, unhook

the tape motor.
Bring the DC voltage up slowly,
watching the current meter. Most meters
will start working at about 8 to 9 volts. If
the current isn't more than about 25 to
30 mA, keep on until you get to 12 volts.
If the current is still fairly low, turn the
volume up just a little and see if the unit
works. The current should run no more
than about 75 to 100 mA at a pretty fair
volume. You can check even fairly high powered amplifiers by keeping the volume down. Resting current should not
exceed 20 to 25 mA (for a ballpark
figure) and increase with volume.
If you want to know the maximum
power output, look at the output transistors. If they are small, say TO -5's, etc.,
the power will be low. If you see TO -66's
or even TO -3's, it's a high - powered unit.
You can check AM, FM and even tape
by feeding an audio signal into the tape
audio input.
Now, connect the DC power supply to
the motor -circuit input through the speed
control circuitry, if used. Bring the voltage up slowly while watching the current;
check the speed by running a test tape.
The motor current and voltage can be
read out on the meters.
If both amplifier and motor are fed
from a single source, just add the currents to find out what your full load will
be. Now add about 1.0 amp for a safety
factor and you're ready to start looking.
Use 2.0 amps as a starting figure. There
are a lot of 12 -volt filament transformers,
rated at
to 3 amps and more, which
should be adequate. Be sure to check the
physical size of the replacement against
the original. Many of them are mounted
in pretty tight places.
If you need a dual 12 -volt supply you
can always use a 24 -volt transformer
with a center-tapped secondary. Ground
the center tap and use each end of the
winding for one of the 12 -volt sources.
You can get any polarity needed (even
12 volts) by hooking up the diodes
correctly. Triad, Thordarson, Signal and
others have catalogs showing suitable
transformers, their electrical ratings and
physical sizes.
Hint: If you have a transformer with a
drain greater than your bench power
supply can handle, check it out one chan1

www.americanradiohistory.com

nel at a time by lifting the collector

supply from one channel. Check it again
at lower volume and get a ballpark idea
of what the maximum full-load current
should be by verifying what type of
output transistor is used. For example, if
the transistor has 2.0 -amp maximum
current rating, that's all you need to
know. Don't be afraid to overrate the
transformer a little. It's better to have it
running cool and happy!
R -E

service
questions
HORIZONTAL -HOLD PROBLEMS
I've got two sets on the bench with
similar problems. A Sears 529.71921 has
very touchy horizontal hold. if the hold
control is not adjusted exactly, it blanks
out the left half of the screen and the
color is lost. A Magnavox T904 shows a
similar symptom-the color is lost before
the picture goes out of horizontal sync.
How can horizontal sync affect color in
these sets?-G. K., Goleta, CA.
Easily! In quite a few sets, the horizon-

tal -hold range is much greater than the

color-hold range. You can lose color
before horizontal sync. The reason: the
phase shift that takes place when you
move the horizontal -hold control too far
in either direction. If the keying pulse
from the flyback moves too far, it is so far
out -of -phase with the color burst that the
burst doesn't get through, and the color killer turns the sync off. The Sears model
could have a badly unbalanced AFC
diode unit. The symptoms are similar.
SPEAKER SUBSTITUTION
I have a color TV with a miserable little
4 -inch speaker that barely fans the air
from about 200 to 4000 Hz! The trouble is
that this unit uses an OTL circuit and a
32 -ohm speaker. Everyone, including you,
tells me not to use an 8 -ohm speaker! Can
you tell me what I could do ? -C. P., San

Clemente, CA.
You can make a 32 -ohm speaker out of
a combination of units. For example,
connect two 16 -ohm speakers in series or

four 8 -ohm units in series. You can

connect these in a row to approximate a
sound column. To check that the units
are all in phase, hook them up and then
touch the terminals of a I.5 -volt battery
to the output leads. Make sure that all
the cones go in or out at the same time. If

one cone does not, reverse its voice -coil

leads.
FOCUS PROBLEM CONFIRMED
I've just read the Service Clinic on
focus problems (Radio- Electronics, July,
1977) and liked it! I've spent many hours
on dogs having this symptom. Here's a
trick I have used successfully on many of
them. Pull the CRT socket off (high
voltage is hooked up) and check for any
voltage on the focus pin. If so, ground the
focus pin and apply power. This will often
loosen the particle that is causing the
short. Gently tapping the tube neck helps
sometimes. Now recheck, and the short
may be gone.
(Thanks very much to Don Davis TV,
Warner Robins, GA 31093.)
TUBE SUBSTITUTE NEEDED
I need a replacement for a 35D5 tube in
an old stereo amplifier. I can't even find a
listing on this one in the manuals. Do you
know of one ?-J. G., Madison, WL
This is an old tube that's new to me.
(I've only been in the business 50 years;
some day I'll learn.) Finally located it in a
1955 Sylvania Tube Manual. This is an

oddball 9 -pin miniature-base, type 9FU

tube.
Your best bet is to replace the 9 -pin
socket with a 7 -pin miniature tube and
use a 35C5 unit, which is electrically
identical to the 35D5. The 35C5 has
another advantage-it's available!
HUE PROBLEM
I use a 20Y1C38 Zenith at home for a
monitor. The set has an oddball color
problem. When I turn the hue control to
minimum, the color disappears. The hue
is off slightly, although there is plenty of
chroma. Anything in your files on this?
B. W., New York, NY.

Replacing the socket cleared up the problem."

Rechecking the detailed list of voltages
showed that the sync separator collector
did read a bit too high. After repair, all
was normal.)
SCREEN WIDTH LOSS
This Zenith 4B25C19 doesn't have
enough width on either side of the
screen. The horizontal output tube, the
damper, etc., all were replaced, and the
B+ voltage is good. The bias on 20LF6 is
off a little. What's causing this ?-W. C.,
Punxsutawney, PA.
I suggest checking all resistors around

the horizontal output tube, etc. (Feedback: "All of them checked OK, and I
was about to look elsewhere when I
noticed a hairline crack on R334, which
is the little 100-ohm resistor on the
20LF6 control grid. I moved it with a
stick and it came apart! The resistor did
not look burned, either. Close observation pays off! ")
PICTURE REVERSAL
I want to experiment with projection
TV, using a small Sears or a Sharp color
set. How can I reverse the picture so that

the lettering will read correctly, from

right to left ? -D. N., Ravenna, OH.
I invented this a long time ago! All you
do is reverse the leads to the vertical yoke.
This turns the picture upside down, but

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see two things that could be causing

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grounded, it will cause hue problems.
Second, if capacitor C156 (.01f) in
series with the hue control leaks, here we
go again. Clue -the grid voltage of the
first color amplifier varies up to 3 volts as
the hue control is turned.
SYNC PROBLEM
This Sylvania D -12 chassis has very
poor sync. I checked and replaced everything I could think of (a detailed list was
enclosed), and nothing happens. Any
ideas would be welcome/ -C. K., Portland, OR.
(I sent him my best ideas. His feedback letter read: "Thanks for the waveforms and data. I found the cause of the
problem. It was a bad socket on sync
separator Q12. Evidently, the very small
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pins had caused enough sync to leak
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111

71

also turns it inside out so that the lettering is a mirror image. This method is

simpler than reversing the horizontal

yoke winding, which, of course, will also
turn the picture inside out.

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WEAK TV AUDIO
I've been working a long time on this
Bradford TV, which has weak audio.
There are some unusual DC voltages on
the 6DT6, including +585 volts on pin 5,
and 0 volts on pins 1 and 6. The manual
shows only +62 volts on pin 5 (the plate).
Where's all that voltage coming from?
D. S., Kearny, NJ.
Well, there's no schematic on this
Bradford model, so we need a tube manual and a clean rag to wipe the crystal ball
with.
In addition to the high voltage on the
plate, there are a couple of other things
that should be checked. Pin 6 is zero.
This is the 6DT6 screen grid, which
should have about + 100 volts on it. With
no screen voltage, the tube probably
doesn't conduct, which would cause high
plate voltage. In many circuits, the
sound -detector plate is fed from the boost
through a high -value resistor. This keeps
the sound from coming on until the set
has warmed up, and gets rid of "warm -up
buzz."

E/CO

CHASSIS "EATS" TUBES

I've got a dandy problem: This CTC -31

RCA chassis eats e 6JE6 tube and a

damper tube about every six months.

When you change the tubes, the set
works perfectly. All the voltages around
the flyback are normal. Any suggestions?-G. C., Birmingham, AL.
Yes. The most likely .answer is that
there is a loss of the horizontal grid drive,
due to horizontal -oscillator signal dropout. Since an intermittent short in or
around the flyback literally "leaves
tracks," there's probably a bad solder
joint, or something similar, in the circuit
between the oscillator and the output
grid. Also, look for a possible crack in the
100 -ohm resistor in the 6JE6 grid.
RESISTORS BURN OUT
When I first looked at this RCA chassis
CTC- 17XAB, the vertical blanking amplifier transistor and resistors R60 (56,000
ohms) and R138 (1000 ohms) were burnt
out. When I replaced them, they promptly
blew up again. The DC voltages on the
transistor don't seem OK. The voltage on
pin 8 of the horizontal output tube is high,
almost double what it should be. What's

happening ?-L. McK., Mansfield, OH.

Resistors burn up because there's too
much current flowing. In this case, the
key clue is burnup of resistor R138 (1000
ohms), which goes only to the 6JE6
suppressor grid. So, the overload current
must come from that point. Check the
6JE6 tube by replacing it. Perhaps it has

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suppressor grid -to- screen short, which

applying too much high voltage to the
blanker transistor and the resistors.
a

is

PICTURE OFF -CENTER

I've just repaired a CTC -22 RCA chassis. It works, but the picture is off-center
to the right, with a %-in. black space on
the left side. This chassis has no horizontal centering control. I even put a
milliammeter in series with the horizontal
yoke winding; the reading showed less
than 1.0 mA DC through the winding. I'm
in the camera end of the TV, and don't get
much set experience. -A. K., Patrick
AFB, FL.

Oh, I wouldn't say that, you're getting

some now! Let's rub the crystal ball. Try
this: Take the signal off and see if the
blank raster is centered. Something
might be upsetting the horizontal blanking, making it too wide.
(Feedback: Bingo! You got me on the
right track. Grid circuit R762 of the
second video had opened up. The blanking pulse at this point was very wide, high
in amplitude and integrated into a broad
pulse. A new resistor fixed it. Thanks. ")
AGC PROBLEM
When I had an AGC problem in a D -12

Sylvania chassis, you suggested heating

up the AGC transistor. Even though I had
replaced this transistor, I tried out your

suggestion. There was the answer! Warm

the transistor up and it goes out. I substituted a better -grade transistor and the
problem cleared up. Thanks. -J. G.,
Brooklyn, NY.
Even a blind pig gets an acorn now and
then!

SERVICE DATA FOR CANDLE TV

Do you know of anyone who has service
data for a Candle MT-510A TV1-Al's TV,
41 Anndale Drive, Willowdale, Ont., M2N
2W9

No, I don't. Normally, we're not supposed to do this, but I must have had at
least a hundred requests for this make.
There are two addresses, "Candle, Los
Angeles, CA," and "Hatzlachi, New
York "; neither of these answer. If anyone
has this data, send it to the Canadian

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technician.
CB THROUGH STEREO
I've got a CB radio, and I'd like to feed
the sound through my Sears stereo amplifier system. I hooked it to the TAPE jack,
but got nothing. -W.F., Marysville, KS
Unfortunately, your TAPE jacks are not
inputs, but outputs for feeding a tape
recorder. Feed the CB sound from the

jack of the CB into the

If you get distortion, reduce the CB volume so that you won't
overdrive the stereo input.
R -E
EXT. SPEAKER
PHONO input.

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THE PORTABLE

HAND
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continued from page 32

clips or
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any edge

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usable almost anywhere.
HOME - AUTO - WORKSHOP
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on this board. Next, install 2.2K resistors

R13 through R20. Be careful when installing these parts. Some of the pads are
pretty close together and solder bridges
can occur if you are not very careful.
Next, install R21 through R24, the crystal and capacitors C10, C I and C12.
Check for shorts and solder bridges and

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then install R11.

Mount transistors Q3 through Q6 next
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next. Install IC5 so the index notch and
the pin -1 dot face the socket for 1C4.
Install R12 and C16. Watch the polarity
of C16. Rectifier RECT1 goes in so the
plus sign faces the closest edge of the
board. Complete the component installation with the addition of capacitors C13,
C14 and C15.
Cut seven short lengths of hookup wire
and strip the ends. Stick an end in the FM,
AM, SW, T, F, M and H pads and solder. Cut
two more pieces of hookup wire. There
are two unmarked pads near 105 and Q2.
These are on the "ground" strip that runs
lengthwise across the board. Connect the
wires to these pads. Connect switches SI
and S2 to the wires from the M and H
pads. Then connect a ground lead to one

Try this exciting

Now you can safely plug away

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of the switches and bus it to the other

switch with a piece of hookup wire. The
other ground lead goes to the ground
point on the interface board.
Turn the board over and install 100K
resistors R8, R9 and RIO, soldering them
directly on the Molex pins. Install D1 and
D2. Be sure that the anodes of both
connect to pin 9 of the IC.
Flip the board back over and break off
the Molex tabs. Carefully install IC4
with pin closest to filter capacitor C16.
1

Bend each wire down and flat against the

board's surface. Stick these wires into
matching holes in the main board,
straighten up the display and solder the
wires to the pads on the main board. Tack
the two boards together with household
cement or a similar adhesive.
Complete construction by connecting
up the display. Use small pieces of hookup wire to connect the anode leads. These
are numbered through 4 and you simply
connect to 1, 4 to 4 and so on. Next
attach resistors R25 through R32. They
go between A on the main board to A on
the display board, DP on the main board
to DP on the display, and so on.

Well, that's it fc
you reach this poi
have next month'
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now. By the time that

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Take the display board and pick up two

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HOBBY CORNER
continuedfrom page 67

od of time, you should check to be sure

that your antenna is at peak efficiency for
maximum range.

tune up for maximum output on a midrange channel (in this case, Channel 23)
then check to see if you have about equal
power on Channels 11 and 37.
Use your FSM to check your antenna
tuning occasionally. (Writing this reminded me that I had not checked mine
for a while. I just checked it and found it
at a maximum 8- channels from where it
was originally tuned to. Now my coverage
should improve a bit.) Since garage roofs,
tree limbs and even normal traveling
vibration can cause detuning over a peri-

CB to ham to CB
At one time, ham operators and CB'ers
did not see eye to eye. Now, however, in
spite of a few die-hards, there is a lot of

cooperation.
Many hams have since discovered the
value of having a CB rig in the car,
particularly when traveling away from
home. What better way to obtain information on road conditions, locations of
restaurants and motels or to summon
emergency road service. Such help is
available on isolated highways, in villages

and towns as well as in the big cities.

Similarly, many CB'ers have decided
to expand their horizons and talk with
ease to others across the state, the country or the world. Some have studied for
the FCC examinations entirely on their
own. Others have been helped by a neighboring ham or a local ham club class. If
you're a CB'er who would like to but has
not taken the plunge, you can obtain
helpful information by writing to the
American Radio Relay League, Newington, CT 06111.
R -E

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DISCWASHER

new products

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More information on new products is available from

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BASICS
The finest record care system is

Discwasher, and the research of the

MICROPROCESSOR -BASED INTERFACE, model 1723, when combined with manufacturer's

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Beware of the heat monster. Taking records from very cold con-

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brush

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FREQUENCY COUNTER, model 710, offers 6digit LED display and LSI circuitry to provide full
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into two positions for burner use or preheating

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an acoustic coupler (with phone handset) or wired

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controls maximum tip temperature while

eight internal D-cells or a 12 -volt battery. Mark /
owners can purchase a fine-tune control kit and
instructions for $7.25 postpaid. -Yaesu Electronics Corp., Box 498, 15954 Downey Ave.,
Paramount, CA 90723.
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ACOUSTIC COUPLER, Pennywhistle 103, is the
first modem in kit form. It can be used either as

three-stage active filter eliminates noise and harmonics.

NEW FROM LEADER

grounded tip protects voltage and current- sensitive parts. Uses an assortment of 17 iron -plated
replacement tips, each available in 600 , 700
and 800 F. Suggested retail price: $45.85.
Weller- Xcelite Electronics Div., The Cooper
Group, Apex, NC 27502.
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COMMUNICATIONS RECEIVER, Mark II version

of earlier Mark l model FRG -7, has a fine -tune
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Components mount on a 5 X 9 -inch PC board;

chassis parts, speakers, speaker grilles, muffs
and line cord are included. Highly detailed manual contains full assembly, test and adjustment
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M&R Enterprises, Inc., Box 61011, Sunnyvale,
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and durability. Recommended for 9-inch to 17inch diagonal TV screen. The barrel is made of
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40- CHANNEL CB TRANSCEIVER, Sidebander V,

is an SSB /AM mobile unit using phase -locked
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TV PROJECTION LENS, model MKII, is an f/2.6,

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SOLDERING /DESOLDERING
continued from page 42
wire tips. Low -cost tip replacements, and
their wide availability, are distinct advantages. However, one characteristic of
such guns should concern you -the wire
tip heats when heavy alternating current
.lows through it. The resultiing AC field
can be dangerous to semiconductors,
meters and other sensitive components.
Also, the low-voltage transformer secondary that supplies the high current is
isolated from the power line and ground,
which makes it susceptible to static buildup. You can avoid this by clipping a
shorting jumper from tip to ground, but
that's unhandy. Both Weller and Wen
make barrel -tip guns to circumvent static

buildup.
Used properly, the safest soldering tool
is a cordless iron because it is not
connected to the AC line during soldering. Hence, no AC leakage is possible.
Rechargeable internal batteries supply
current to heat the soldering tip. Between
actual soldering times, the iron rests in a
charging cradle that restores the battery
charge.
A simple procedure will avoid the static- electricity complication that exists
even with a cordless iron. After turning
on the iron or gun, and just before touching it to the connection(s) to be soldered,
first touch your hand and then the

soldering tip to the chassis ground AND

the ground bus of the equipment you're
working on. That may seem a bit of
trouble, but it can become a habit. This
precaution discharges any static buildup

EXTENSIVE USE OF IC's calls for new soldering

and desoldering techniques.

so that there is none left.

If you buy a cord to run a battery operated iron directly from the power
line, and expect to use the iron around
FET's and IC's, make the leakage test
with the AC cord plugged in. Continue
the static -grounding procedures described above whenever you use the iron.
Wahl Clipper even offers a cigarette lighter plug and cord that lets you
recharge the soldering iron's NiCad batteries while you're on the road.
Finally, as you consider soldering tools,
you have to look at tips. Most common
are the pyramid tip and the chisel tip.
Table II shows a number of variations on
turn page

NLS LEADS AGAIN!!

MS-15

MINISCOPE

ALDELCO ELECTRONICS COMPANY

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S 99.95
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ADVANC
PLECiROi1V/C

__

the chisel tip: screwdriver, spade, and

various chisel shapes, sizes and tapers. In
addition to the pyramid tip, there are
conical or "pencil" shaped tips-some
needle -pointed, some with blunted ends.
Two main varieties: the regular type, in
low- and high- wattage sizes, and a special,
plated long -life version with a rounded

For

faster

tip.
Choosing a tip depends primarily on
one consideration: whatever shape transmits the most heat to the surfaces you
plan to solder. When you begin heating a
joint, your chief concern is to place as
much heated soldering -tip surface in contact with the joint as you can. Thus, chisel
tips work well when you solder wires to
Hat terminals. To solder thin wires to
holes in PC boards, fine -pointed tips are
preferable. A broad chisel tip heats best
for soldering to a chassis.

service
USE

ZIP
INTERNATIONAL FM 2400CH

CODE

Cleaning and tinning

Given the right iron size, the right tip
and the right temperature, you still have

FREQUENCY METER

for testing
mobile
transmitters
and receivers
Tests Predetermined

Frequencies
25 to 1000 MHz

Extended Range Covers

950 MHz Band
Pin Diode Attenuator for
Full Range Coverage
as Signal Generator
Measures FM Deviation

some other concerns if you want dependable soldered connections.

First, all surfaces to be joined by solder
must be clean. Chassis, terminals, wires,
foils, whatever-the surfaces must be

on

all

clear, not only of dirt or grime or accumulated oils (like fingermarks), but of
oxidation too. Sanding or wire -brushing
gets rid of most surface foreign matter.
Scrape the surfaces of component wires

mail

EIGHT
INSTRUMENTS IN ONE

Out-of- Circuit
Transistor Analyzer
Dynamic In- Circuit
Transistor & Radio Tester
Signal Generator
Signal Tracer Voltmeter
Milliammeter
Battery Tester

The FM- 2400CH provides an accurate frequency

standard for testing and adjustment of mobile
transmitters and receivers at predetermined

frequencies.

The FM- 2400CH with its extended range covers

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and /or the intermediate frequencies of the receiver between 5 MHz and 40 MHz.
Frequency Stability: .0005% from+ 50to +104F.
Frequency stability with built -in thermometer
and temperature corrected charts: .00025% from
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available).
Self- contained in small portable case. Complete
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FM- 2400CH (meter only)

$595.00
24.00 ea.
18.00 ea

crystals (with temperature correction)

crystals (less temperature correction)
IF crystals
catalog price
RF
RF

Diode Checker

Transistor Analyzer

Model

YOU DON'T NEED A BENCH FULL OF EQUIPMENT TO TEST TRANSISTOR RADIOS!

10

North Lee. Oklahoma City. Oklahoma 73102

All the

facilities you need to check the transistors themselves and the radios or other cirhave been ingeniously engineered into the compact,
cuits in which they are used
6-Inch high case of the Model 212. It's the transistor radio troubleshooter with all the
features found only in more expensive units. Find defective transistors and circuit

troubles speedily with

single, streamlined instrument instead of an elaborate

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Features:
Checks all transistor types
high or low
power. Checks DC current gain (beta) to
200 in 3 ranges. Checks leakage. Universal test socket accepts different base
configurations. Identifies unknown transistors as NPN or PNP.
Dynamic test for all transistors as signal
amplifiers (oscillatnr check), in or out of
circuit. Develops test signal for AF, IF,
or RF circuits. Signal traces all circuits.

EMC, 625 Broadway, New York 12, N.Y.

Send me FREE catalog of the complete

value -packed EMC line, and name of

local distributorNAME

RE -1

ADDRESS
CITY

7ONE_STATE

Checks condition of diodes. Measures

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circuit drain or other DC currents to 80
milliamperes. Supplied with three exterELECTRONIC MEASUREMENTS CORP.
nal leads for in- circuit testing and a
625 Broadway, New York. N Y 10012
pair of test leads for measuring voltage
and current. Comes complete with
Instruction manual and transistor listing.

EMC

International Crystal Manufacturing Company, Inc

212

Factory Wired & Tested $30.57

Easy -to-Assemble Kit- $20.36

CIRCLE 56 ON FREE INFORMATION CARD

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CORDLESS SOLDERING STATION BY UNGAR

consists of a rechargeable iron and recharger.
The charging holder comes with a tip cleaning
sponge.

bright before you insert them in PC

boards or terminals. Burnish the pins of
DIP integrated circuits before you plug
them into the board for soldering. Wirebrush (or use clean steel wool) the surfaces of printed foils before you insert
new or replacement parts. Clean off resin
residue and old solder.
Make sure the solder you use has rosin
flux in it. It cleans and deoxidizes surfaces just ahead of the solder flow. However, do not depend on flux to do the
whole cleaning job because it does get
past oxidation, but not much else.
Parts removal made easy
Any technician can figure out how to
untangle component leads from terminals
in a hand -wired chassis. Unfortunately,
not many radios, TV sets or other electronic equipment nowadays are hand-

wired. Practically everything uses PC

boards.
This would present no problem if all
you had to remove and resolder were
capacitors or resistors. Even transistors
usually have wires that you can grab with
long -nose pliers and pull out of their PC
board holes while you melt the solder on
the underside of the board.
What can really throw you is trying to
remove a 16 -pin DIP integrated circuit
from a PC board. You can melt the
solder at one or two pins, but the other
pins still hold the IC solidly. However,
there's a shiny side to this coin:
Techniques for removing IC's work just

as efficiently for other PC- boardmounted components. Using correct procedures insures neat workmanship in all
parts replacements.
Naturally, with so much of this kind of
work to be done, tool makers have come
up with plenty of gadgets to aid in the
task. Firms that responded to our requests for information are listed in Desoldering Tool Chart II.
Simplest are squeeze -bulb solder suckers. They look like an ear-syringe, but
have Teflon tips to withstand the heat of
molten solder. You heat the joint,
squeeze the bulb and hold its end near the
turn page

LogiMetrics

MEASURES
UP
(and down, too)

CB 981 Transceiver Test Set does it all

The CB 981 is a precision, easy -to -use and error -proof instrument
for the continuous high volume testing and servicing of all
40 channel CB transceivers. It requires no other test equipment.
Channels are fully synthesized and output channels are displayed
by large, bright 7 segment LED's. Other features nclude:
Full power measurement receiver sensitivity measurement and
modulation measurement for both SSB and A.M. transceivers.
Write or call for complete details and pricing.
,

MODEL 101 AUDIO TEST SYSTEM consists of two sine/

square/triangle function generators, pulse generator, frequency counter and AC voltmeter. As a system it will generate a frequency response plot on an X -Y recorder or scope.

Time base generator offers symmetrical or independent

control of the positive and negative sides of the ramp
providing a duty cycle of 1% to 99 %. Frequency range
is .002 Hz to 100k Hz. Amplitude is 16 Vpp into 500 ohms
with 5 VDC offset. The time base output drives the X axis
of an X -Y recorder. Manual mode provided for setup.
Audio sweep generator provides manual frequency adjustment or log or linear sweep of 20 Hz to 20k Hz. Blanking
mode provides zero reference line on an X -Y recorder or
tone burst. Amplitude is 16 Vpp into 500 ohms or 10 Vpp
into 8 ohms.
Pulse generator frequency range is .002 Hz to 800k Hz.
Pulse width is adjusted independent of frequency from 4
seconds to 40 nanoseconds. Outputs are complementary
TTL.
AC voltmeter has full scale sensitivities from 1 mV to 250
V. Fast or slow, peak or true RMS and log or linear modes

are provided. Output drives Y axis of X -Y recorder.

Frequency counter is 6 digit, 50 or 60 Hz line triggered, and

reads either internal or external. Sensitivity is 10% of voltmeter full scale at 20k Hz. 1 or Ya second update.

Dimensions: 8x14x3. Shipping weight: 9 lbs.

$650. Stock to 30 days. Warranty: 1 year, 3-year $60.

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minimum 15 words.
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ONLY FIRST WORD AND NAME set in bold caps. Additional bold face (not available as all caps) at
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&

INSTRUCTION

GRANTHAM's FCC License Study Guide -377

pages, 1465 questions with answers/discussions-covering third, second, first radiotelephone examinations. $13.45 postpaid. GSE PUBLICATIONS, 2000 Stoner, Los Angeles, CA
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Write for Free Catalog. You are invited to visit our store above.

Catalog

service
4111411111404,41444114,s,

..,5n,fiw

'

HOBBYIST give your project the professional

look. PRINTED CIRCUIT boards from your sketch
or artwork. Affordable prices. Also fun kit
projects. Rush free details. DANOCINTHS, Box
261, Westland, MI 48185

faster

,F

MO HM

NEGATIVE Ion generator. Complete plans$ 10.00. Fascinating details -$1.00. GOLDEN
ENTERPRISES, Box 1282 -RE, Glendale, AZ

ON

techniques learned from FBI, CIA, KGB, comput

er experts and professional police
230 pages
$9.95. OUIMTRONIX, Box 548-RE, Seattle,
WA 98111

STOP! Take a minute S let us send

our latest kit catalog. 1f you like,
send us the name M address of a
friend who may also be interested
and we'll include to you our booklet

tY
E

Brother game. Complete collection o

schematics, surveillance and Investigative

FREE KIT

CHRISTMAS SPECIAL
BSI DMM KIT Reg. $77.77 N.044
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NEWT Big

YOUR NEARBY RADIO SHACK

ALITY PARTS AT LOW PRICES!
manufacturer's quality control procedures. These are not rejects, not
fallouts, not seconds. In fact, there are none better on the market!
Count on Radio Shack for the finest quality electronic parts.

Top quality devices, fully fun,ttional, carefully inspected. Guaranteed

to meet all specifications, both electrically and mechanically. All are
made by well known American manufacturers, and all have to pass

TTL Digital ICs

Tantalum Capacitors

Resistor and Capacitor Packs

First Quality

Maximum capacity in smallest size. Low

ESR, highly stable electrical characteristics and low leakage. Radial leads.

Made by
National
Semiconductor
and
Motorola
Type
7400
7402
7404
7406
7410
7413
7420
7427
7432
7441

7447
7448
7451

7473
7474
7475
7476
7485
7486
7490
7492
74123
74145
74150
74154
74192
74193
74194
74196

1t
Cat. No.

Cat. No.
276 -1801
276 -1811
276 -1802
276 -1821
276 -1807
276 -1815
276 -1809
276 -1823
276 -1824
276 -1804
276 -1805
276 -1816
276 -1825
276 -1803
276 -1818
276 -1806
276 -1813
276 -1826
276 -1827
276 -1808
276 -1819
276 -1817
276 -1828
276 -1829
276 -1834
276 -1831
276 -1820
276 -1832
276 -1833

ONLY
350
390
350
490
390
790
390

272 -1401
272 -1402
272 -1403
272 -1404
272 -1405
272 -1406

Resistor and capacitor kits in handy plastic storage boxes you

can use over and over again. Stock up!

Pkg. of 350/9.95
Pkg. of 350/9.95
Pkg. of 175/9.95
Pkg. of 35/9.95
Pkg. of 36/9.95

It Watt, 10% Tolerance Resistors. 271 -601

ta Watt, 5% Tolerance Resistors. 271 -602

50WVDC Ceramic Disc Capacitors. 272 -601

35WVDC Radial Lead Capacitors. 272 -602
35WVDC Axial Lead Capacitors. 272 -603.

ptF

0.1

0.22
0.33
0.47
0.68
1.0

Each

Cat. No.

Each

390

272 -1407

390
394
394
394
394

272 -1408
272 -1409
272 -1410

2.2
3.3
4.7
6.8

272 -1411

10.0

450
454
494
494
494

Nos. 1401 -1408, 35WVDC; 1409 -1411, 16WVDC.

49C

490
990
990
990
390
490
490
790
590
1.19
490
790
690
99c
1.19
1.39
1.29
1.19
1.19
1.19
1.29

PC Board

Accessories

Build an LED
Digital Clock

K.y

.J

fastest.
photographic PC board processing kit
easiest way to produce perfect printed circuit projects.
12.95
276-1560
1.19
Etch -Resist Marking Pen. 276 -1530
1.89
Etchant Solution. 276 -1535
1.98
276
-1573
PC Board Assortment.
8 -piece

CMOS ICs

Module. Just add a transformer and switches for a

14.95
complete clock with 0.5" LED display. 277-1001
3 99
Transformer for above. 120VAC 60 Hz. 273-1520
5/1.99
SPST Miniature Pushbutton Switch. 275-1547
3 95
Display Case. 113,6x37/ex47hn" 270 -285
12 -HR LED Clock

Power Supply Parts

LED Digital Displays

100% guaranteed
electronically

and

mechanically
Type
74C00

Cat. No.
276-2301

74CO2

276 -2302

74C04
74C08
74C74
74C76
74C90
74C192
74C193

276-2303
276-2305
276 -2310
276 -2312
276 -2315
276 -2321
276 -2322
276 -2401
276 -2411
276 -2413
276 -2417
276 -2420
276 -2427
276 -2449
276 -2450
276 -2447
276 -2490

4001
4011
4013
4017
4020
4027

4049
4050
4511
4518

ONLY
490
490

490
49C

896
890
1.49
1.69
1.69

Digits

nt
1

FE

Size

Drive
Anod.
Cath.
Anod.
Cath.

Cat. No.
276 -056
276 -066

276-053
276-062

Digits

ONLY
2.99

10

2.99
1.99
1.99

lx

1
1

4
5114

Size
0.3"
0.3"
0.5 "
0.5"

Drive
Anod.
Cath.

Anod.
Cath.

Cat. No.
276 -1210
276 -1211
276 -1201
276-1202

ONLY
416.99

4/6.99
6.95
6.95

-Amp Full -Wave Bridge Rectifier. 50 PIV.

276 -1180
50V 3-Amp Power Rectifier. 300 -A surge.
6

276-1141

49C

496
890
1.49
1.49
890
690
690
1.69
1.49

IC Accessories

Linear ICs

By National Semiconductor

and Motorola
Type
301CN
324N
339N
386CN
555CN
556CN
566CN
567CN
723CN
741CN
741H

first quality

Cat. No.
276 -017
276 -1711
276 -1712
276 -1731
276 -1723
276 -1728
276 -1724
276 -1721
276-1740
276 -007
276 -010

Heavy -Duty Transformers. All for 120VAC, 60 Hz.

Cat. NO

Volts

Current

Size

Each

273 -1512

25.2 CT

2A

23/4x2f4x2"

273 -1513
273 -1514

12

58

4e2x2'h"

18 CT

4A

4x2x21/2"

4.99
8.95
8.95

Silicon Solar Cells

490
1.49
1.49
990
790
1.39
1.69
1.99
690
490

276-1713
276 -1705

990

276-1706
276-038

1.99

276 -1701

990
990
1.29
1.29
1.29

276-1702
276-1770
276-1771
276-1772

276-1995

99

14
16

9 95

1.99
1.29
1.49

28

40

2/89944

276 -1998
276 -1997
276-1996

21990
Ea. 896
Ea. 990

Computer Chips

Produce Power from Light!

2cmx4cm. 0.5V at 100mA. 276-120
2cmx2cm. 0.5V at 60mA. 276.128

490
990

3911N
75491
75492
7805
7812
7815

Pries

Cat. No.

ONLY

3900N
3909N
4558CN

..

eus Strip. 276 -173

Experimenter Socket. 276-172
DIP Switch. 275-1301
DIP Header. 276 -1980
Hight Angle 16 -Pin Sockel. 276.1985

2 99
3 49

3300 F at 35V. 272-1021

5000 eF at 35V. 272 -1022

Low-Profile DIP Sockets

Pins

99

Pkg. 2/690

Electrolytic Capacitors

The CPU and Memory IC's

you need for building your
own personal computer.

Clock
Chips

2
1

99
99

WPM

79C

8080A Microprocessor. An 8 -bit Na-

tional Semiconductor chip in

40 -pin DIP. 100% Prime.
276 -2510

17.95

WHY WAIT FOR MAIL ORDER DELIVERY?

IN STOCK NOW AT OUR STORE NEAR YOU!
Prices may vary at individual stores and dealers

2102 Static RAM. 1024 -word by

one bit read /write memory. Under
600 nS access time.
276.2501
2 49 Ea. or 0/14.95

50252. 12-hour clock, 24 -hour alarm chip. With

699
full specifications. 276 -1751
7001. 12 -hour calendar alarm clock IC. With all
10.95
data. 276-1756

Radio Ihaek
FORT WORTH, TEXAS 76102
OVER 6000 LOCATIONS IN NINE COUNTRIES

A TANDY COMPANY

www.americanradiohistory.com

MORE THAN 20,000 DIFFERENT COMPONENTS

7400 TTL
7400

.18

7401

.21
.21
.21

7402
7404
7405
7407
7408
7409

.24
.45
.25
.25

7410

.20

7411

.30
.85

7413
7416
7417
7420
7422
7425
7427
7428
7430

43
.43
.21

1.50
.43
.37
.35

.26

7432
7437

.31

7438
7440

.40

7441

1.10

.47
.21

7442
7448
7450

1.08
1.15
26

7451

7453

27
.27

7454

41

7460
7472
7473
7474
7475
7482
7483
7485

.22
39
.45
.45
.80

1.75
1.15
1.12

7486
.45
7489 2.49
7490
.69
7491
1.20
7492
.82
7493
.82
7494
.91
7495
.91
7496
.91
74100 1.25

LINEAR

74107
74121
74122
74123
74125
74126
74132
74141
74150
74151
74153
74154
74157
74161
74164
74165
74166
74174
74175
74180
74181
74191
74195
74197

.49
.55
49
1.05
.60

75450BP
75451BP
754528P
754538P
754548P
75491BP
75492BP
CA3005
CA3006
CA3018
CA3018A
CA3026
CA3046

.81

3.00
1.15

1.10
1.25

1.35
1.54
1.30

74LSO4 .45
74LS10 .39
74LS20 .39
74L551 .39
74LS74 .65
7415112 .65

74H01

74H04
74H05
74H10

.33
.33
.33
.35
.33

74H11

74H20
74H21

74H30
74H40

.33
.33
.33
.33
.33

1.65

2.50
1.60
1.60
2.50
1.50
1.50
1.50
1.30
1.35
1.25
2.25

2.25
1.25
1.25
1.95
1.55
1.70
1.85
2.65
.50

1.00
1.00

4021 AE

29
.29

.29
.58
.29
.29
1.25
.65

1.10
65
1.75
1.50

.98
1.89

10

1N4001
1N4002

1N4003
1N4004
1N4005
1N4006
1N4007

For
60

2.50
5.50
2.25
1.95

.70
.80

.90
1.00
1.10
1.20

.80
.45
30
.45

5400
5404
5410
5426
5473

1.00
1.25
1.00
1.25
1.50

5475
5486
5493
54100
54LSO4

1.65
1.15
1.00
.70
.50

1.25
.85
.85
.75
3.75

2SA643
2SA673
2SA678

2SA679
2SA680

3.75

2SA682

.85
.90
.95

2SB77

.70
.55
.60
.60
1.00
1.75
1.60
.65
.85
1.65
.85
.75
1.25
1.65
1.50
2.10
1.25
.95
.90
.70
3.00
1.00
1.00
.65
.70
.70

258175
2S8186
25E1337

1.80
1.00

LM340K-15
LM340K-18
LM340K-24
LM340T0-5
LM340T0-6
LM340T0-8
LM3401612 1.75
LM340T615 1.75

RESISTORS

V. Watt 5% Packed 5 of any

one value
$ 25
Y Watt 5% Packed 5 ofany
one value
30
STANDARD RESISTANCE VALUES

LM340K$

258367
258370
2S9405
258407
258415
258435

1.95
1.95
1.95
1.95
1.95
1.95
1.75
1.75
1.75

LM340T0-18 1.75

LM34070-241.75

2SC460
2SC478
25C481

25C482
25C484
2SC485
2SC493
2SC494
2SC495
2SC496

258461

258463
2S8474
258481
258492
258495
258507
258511
2SC116

2SC183
2SC184
2SC281
2SC371

25C372

.65
.70
4.90
4.90
3.80
.70
25C620
.80
25C627
1.75
2SC634A
.65
25C644
.70
2SC674
.60
2SC708
3.00
2SC710
.70
25C711
.70
2SC712
.70
2SC715
.70
2SC730
.65
2SC731
3.00
2SC732
.70
2SC733
.70
2SC537
2SC608
2SC609
2SC614
2SC619

.29
1.50
.35
1.60
2.90
.65
4.50
2.40
1.50
.75

10M F50

10M8150
25MF35
C1702A

\`

2101

75

2102

2N2160.65
2N2646.45
2N2647.55

MU4892.50
MU4893.50
MU4894.50

2N4851 .75
2N4852 .75
2N4870 .50
2N4871 .50

2N6027.55

MU4891.50

2N6028 .70
D5E37

MU10
MU20

.35
.35
.40

.70
.70
3.00
.70
1.75
2.75

2SC738
2SC756
2SC763
2SC774
2SC775

.70
1.00
2.15
1.00
1.75
2.50
3.10
3.50
.75
4.00
.75
.75
1.60
.70
.85
1.00
5.85
.70
.70
.55
.70
.65
.65
.65
65
1.50
1.50
1.50
1.50

3.50
.75

1.65
3.75
3.75
1.20
1.15

2.75
4.00
1.25
.70

30MF25
47MF25
47MF50
100MF16
100MF25
500MF50
1000MF35

2SC1306
25C1307
25C1308
25C1317
2SC1318
2SC1327
2SC1342
25C1347
2SC1359
2SC1377
2SC1382
2SC1383
25C1384
25C1447
25C1448
25C1449
25C1475
25C1507
25C1569
2SC1675
2SC1678
2SC1679
25C1728
25C1730
2SC1756
25C1760
25C1816
25C1908
25C1909
2SC1957
25C1964
2SC1973
25C1974
25C1975
25C2020
25C2027
25C2028
2SC2029
2SC2034
2SC2074
25C2075
2SC2091
2SC2092
2SC2166

4.00 251145
4.00 2SD68
4.25 25072
.95 2SD77
.75
.75
1.00
1.25

2SD81

25088
2SD92

250118

4.50 250130

400 250170

BB D BUCKET BRIGADE DEVICE

M M 3001
19.50

Axial Leads
Radial Leads

2S0180
250187
250188
250201
.70 250213
.70 250218

2.75

.50 2SD223
.80 250234
.65 250235

4.50

4.75
5.75
4.75
.60

5.50 2SD257
1.00 250261
.75
.85
1.25
1.25
1.30
1.50

1.25
1.25
1.75
5.50
4.75
2.15

250287
250288
2S0291
25D300

250313
2S0314
250315
250318
2SD325

2S0330
250331
250350
.60 250360

1.25

2.15
4.50
.70

4.75
1.50

4.75
1.50
4.90
4.90
2.50
6.00
1.10
4.75
3.00
3.00
5.50
1.10
4.75
4.75
2.00
.90
1.00
1.00
3.25
1.50
1.50
3.25
1.25
2.00

.80
.95

1.95
3.75
4.75
1.00
1.00
2.00
.80

4.00
1.00
.85
2.50
1.10
1.10
.75

.95
1.25
1.50
.90

3.25
1.50
2SCF8
3.50
2SCF6
1.25
2SF8
3.00
HEPS3001 3.25
JSP7001
.75
MRF8004 3.00
MPS8000 1.25
MPS8001 1.25
MPSUO2
.50
MPSU31 4.00
501074 19.95
SD1076 28.95
SK3047
3.75
SK3048
3.25
4.75
SK3049
1.25
SK3054
25K19
1.75
25K30A
1.00
2SK33
1.20
2SK41

1.75

3SK22Y
3SK40
3SK45
3SK49
4004
4005
40080
40081
40082

2.75
2.75
2.75
2.75
3.00
3.00
1.25
1.50

3.00,

Radial Leads
Radial Leads
Radial Leads
Axial Leads

Axial Leads

9.95
2708
34.95
8008
5.75
C51013
4.50
8080A
1.75
MM5013
3.25
8224
Contact us for all your microprocessor needs.

DN834
DN835

M N 3002
11.70 M M 3003 9.45
DN837
1.50
DN8381NEW1

1.25
1.35

ZENER DIODES

.18
.19
.24
.19
.24
.60
.65

Watt. t0*
Watt. t0,0
Voltages 20 200. and

$_30 each to33V

$.40 each to33V
available

JAPANESE ICs
AN136
AN203
AN208
AN210

MICROPROCESSOR

19.95
19.95

AN211

AN214
AN217
AN227
AN239
AN241

HARDWARE - SOCKETS

UNIJUNCTIONS

30

25C734
2SC735

HALL IC:

.15
.15
.15
.15
.16
.20
.18

.75

3.00
4.00
4.00
3.00

IC's ON THE MOVE

Canada $1.50.
N.J. Residents add 5% sales tax

Axial Leads
Axial Leads
No Polarity
Axial Leads
Axial Leads
Axial Leads
Axial Leads

.80

4.25

2SC776
25C777
2SC778
25C781
25C784
25C785
2SC788
2SC789
2SC790
2SC793
2SC798
2SC799
2SC815
2SC821
2SC828
2SC829
2SC830
2SC838
25C839
2SC853
25C866
25C871
25C900
25C922
2SC929
25C930
2SC938
2SC945
25C1000
2SC1013
25C1014
2SC1017
25C1018
2SC1034
2SC1060
25C1061
25C1079
25C1080
25C1096
25C1098
25C1115
25C1116
2SC1124
2SC1166
2SC1170
2SC1172
2SC1172B
2SC1173
2SC1209
25C1211
25C1213
2SC1226A
25C1237
25C1239

N..

MINIMUM ORDER $5.00

All orders add 81.00 Postage and Handling.

2.2MF50
3.3MF10
3.3MF10
10MF25

3.75
3.25
2.75
3.50
1.10
1.15
1.60
1.50
1.25

2SA683
2SA684
2SA699
1.30
2SA699A 1.45 2SC497
2SA706
.55 2SC502
2SA733
.65 2SC509
2SA777
.90 25C515
25822
.65 2SC517
25854
.70 2SC535
25856
.70 2SC536

VOLT.REG
LM340K-5
LM340K-6

2SC380
25C381
2SC382
2SC387
2SC394

4.25 2SC403
.65 2SC454
1.25 2SC458

2SA628
2SA634
2SA636

$1.49

1.50
1.90
2.00

.70
.70
.65
.70
.70
.70
.70
.70
.65
.65
.70
.70
.80
1.85
1.75

3.00 2SC374
.80 2SC375

258187
258324

1 5400 SERIES

.39
.39
.59
.59
.65

.75 2SC373

2SA497
2SA562
2SA564
2SA606

1.50

"x3 "$.50.6 "x6 "$.90.6 "x8 "$1.20

100

5.00
6.00
7.00
8.00
9.00
10.00
11.00

.75
.45

2SA473
2SA484
2SA489
2SA495
2SA496

(-ELECTROLYTIC CAPACITORS

4023AE
4024AE
4025AE
4028AE
4029AE
4030AE
4037AE
4040AE
4044AE
4049AE
4050AE

For

NE556
UA702
UA703CH
UA709CH
UA749CH

JAPANESE TRANSISTORS
.45
.90
.45
.80
1.50
1.00
.60

PC BOARDS - MIL GRADE

Glass- epoxy. 2 oz. copper.

MC1460
3.95
MC1469R
2.50
MC1489
4.60
MC1496
1.65
MC1510G
8.00
MC1514L
4.50
MC1595L
6.25
MC1723CL
3.60
MC1741CG
1.20
MC1810P
1.25
MC3004L
2.25
MC3007P
2.25
MC3021L
2.15
MC3060L
2.65
MC3062L
3.00
MC4024P
2.20
MC4044P
4.80
MC14507CP 1.25
MC14511CP 2.76
MC14512CP 1.70

(RECTIFIERS

1.25
1.45
2.25
.60

NE5558
NE555V

ona2 "x71/4 "sheet

C MOS
4001AE
4002AE
4007AE
4010AE
4011AE
4012AE
4015AE
4016AE
4018AE
4019AE
4020AE

LM741CH
LM747
LM748H
LM1458N
N5556V

Boards, Includes IC pads, donuts, angles, and 3 -and 4 -connector pads. Over 225 patterns

1.50

MOTOROLA
MC663P
MC666P
MC670P
MC679P
MC725P
MC789P
MC790P
MC817P
MC836P
MC844
MC853P
MC876P
MC1004L
MC1010L
MC1305
MC1352P
MC1357
MC1371
MC1439
MC1458P

.35
.35
1.25
.90
1.50
1.85
.65

NEW FROM NEW-TONE

Dry Transfer Patterns for PC

1.70
1.95
1.95
1.05
3.55

74LS113
74LS138
74LS174
74L5386
74S153
74S387
74H53
74H55
74H73
74H74
74H76

.35

LM301H
LM307H
LM309K
LM311H
LM318N
LM339N
LM351AN
LM370N
LM380N
LM566
LM711CH
LM723H
LM741CN

1.65

74H00 TTL
74H00

1.60
3.50
1.10
1.60
1.50

1.45

74L SERIES TTL

74L00 .33
74L10 .33
74130 .33
74L42 1.50
74L86 .69
74LS00 .39

.49
.39
.39
.39
.39
.79
.85

AN274
AN315

Nylon Screws, Nuts and Rivets 50 piece assortment $1.99

MK 20 TO -3 Mounting Kit
5 for 5.99
NT -505 Mica and bushing. Specify
TO-3. TO-66 or T0-220
10 sets for $.99
IC Socket
14 -Pin DIL
8.25 each
IC Socket
16-Pin DIL
s.27 each
Wire Wrap
16Pin DIL
8.32 each

BA511
BA521

HA1202
HA1306W
HA1308
HA1312
HA1322
LA1201
LA3301
LA4000

\L4030

2.90
3.75
4.75
3.10
3.30

LA4031P
LA4032P
LA4051P
LA4400FS
LA4400FR

4.90 LD3080
3.30
5.80

LD3120

5.50
1.85
2.25
2.25
4.90

4.00 TA7075P

4.90

3.10
5.40
4.80
PLLO1A
13.50
PLLO2A
12.00
PLLO2A-G 12.00
SG613
5.40
STK011
10.50
STK015
6.50
STK032
14.20
STK050 24.50
STK056
11.35
STK4t5
8.50
TA7028M 3.50
TA7045M 3.50
TA7051P 3.50
TA7054P 3.05

M5112
6.50 M5115PR
3.20
3.95
3.50
3.50
3.95
3.10
5.20
4.50
4.05
5.20
4.25
4.85
5.50
4.85

TA7055P
TA7060P
TA7061 P
TA7063P
TA7074P

3.50
4.50
4.65
3.80
3.80

TA7076P
TA7089P
TA7120P
TA7120P-C

4.55
2.90
2.20
2.20
TA7122AP 2.30
TA7124P
1.85
TA7150P 4.55
TA7153P
6.90
TA7201P
6.40
TA7202P 4.50
TA7203P
7.00
TA7204P 6.50
TA7205P 6.50
TC4011P
.55
TC5080P 12.00
TC5082P 12.00
TC9100P 12.00

UH1C004 9.00
UPC16C
2.50
UPC20C
5.00
UPC41C
325
UPC48C
3.95
UPC554C 3.90
UPC555H 3.00
UPC563H2 8.00
UPC566H 2.25
UPC575C 4.10
UPC576
4.10
UPC592H2 100
UPC595C 3.60
UPC596C 3.50
UPC1001H25.15
UPC1008C 6.00
UPC1020H 5.50
UPC1025H 5.50
UPC1156H 6.50
UPD277C 4.50
UPD857C 19.00
UPD858C 13.00
UPD861C

POPULAR JEDEC TYPES

434
1N60

1N270
1N914
1N4148
1S1555

2N173
2N338A
2N404
2N443
2N508A
2N706
2N718
2N718A
2N918
2N930
2N956
2N1302
2N1305
2N1420

.25
.25
.25
.10
.25
.35

1.75
1.05
.75

2.50
.45
.25
.25
.30
.60
.25
.30

1.25
75
20

2N1540
2N1544
2N1554
2N1560
2N1605
2N1613
2N1711
2N1907
2N2102
2N2160
2N2218
2N2218A
2N2219
2N2219A
2N2221

2N2221A
2N2222
2N2222A
2N2270
2N2369
2N2484

.90
.80

1.25
2.80
1.75
.50
.50

4.10
.70
.70
.25
.30
.25
.30
.25
.30
.25
.30
.40
25
.32

2N2712
2N2894
2N2903
2N2904
2N2904A
2N2905
2N2905A
2N2906
2N2906A
2N2907
2N2907A
2N2913
2N2914
2N3019
2N3053
2N3054
2N3055
2N3227
2N3247
2N3250
2N3393

.18
.40

3.30
.25
.30
.25
.30
.25
.30
.25
.30
.75
1.20
1.00
.30
.70
.75
1.00

3.40
50
20

ALL PARTS GUARANTEED

2N3394
2N3414
2N3415
2N3416
2N3417
2N3442
2N3553
2N3563
2N3565
2N3638
2N3642
2N3643
2N3645
2N3646
2N3731
2N3740
2N3771

2N3772
2N3773
2N3819
2N3823

.17
.17
.18
.19
.20
1.85
1.50
.20
.20
.20

20
.20
.20
.14
3.75
1.00
1.75

130
3.00
.40
70

2N3856
2N3866
2N3903
2N3904
2N3905
2N3906
2N3954A
2N3955
2N3957
2N3958
2N4037
2N4093
2N4124
2N4126
2N4141
2N4142

.20
1.25
.16
.16
.16
.16

2N4402
2N4403
2N4409
2N4410
2N4416
2N4441

3.75
2.45

2N4442
2N4443

1.25
1.20
.60
.85
.16
.16
.20
.20

2N4852
2N5061

2N4143
2N4220A
2N4234
2N4400

.20
.45
.95
.16

2N4401

16

2N5064
2N5130
2N5133
2N5138
2N5294

2N5296
2N5306
2N5400
2N5401

2N5457
2N5458

.16
.20
.20
.16
.75
1.00
1.15
1.35
.55
.30
.50
.20
.15
.15
.50
.50
.20
.40
.50
.35
.30

NEW-TONE
ELECTRONICS
PO BOX 1738R BLOOMFIELD, N.J. 07003
\ PHONE: (201) 748 -6171, 6172, 6173

WRITE FOR FREE CATALOG

CIRCLE 40 ON FREE INFORMATION CARD

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UNIVERSITY degrees by mail! Bachelors, MasFree revealing details. COUNters, Ph.D's

SELING, Box 317-RE, Tustin, CA 92680

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0 CALIF. 92105

3 -5MHz

flyer

Solid State

Oscilloscope

sT,1TEMENTOFOWNERSHiPMnNnOEMENT AND CIRCULATION

1 LLL'7atmu.._-,3,..,.

..:.:.;:".:::.

,,..eo.

.,,o...-.c.-.

+.M[Edltar n-Eblef .....

2
rt
SaNEh W. Yaat Nte_iYr!
enuer5oun,,xe. torkNev Yort lOaoY
Evrnue

Usable deflection to 15MHz 35nSEC rise time permits accurate display of

high -speed square wave pulses Large 8 x 10cm rectangular viewing area

.-a-...

avan SwW.c.

'20alar

icationa Inc

Lm.nl5txuhrr,

av.n.. Snab-Ne.

200_Pa.

la

Yncl Na. Yurl 1wW

NONE

......,.-

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ca.....,....,..,,_n-,

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uv

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Internal
11.7 nS rise time 30 MHz dual trace operation
signal delay line 2t position sweep switch Intensity modulation
compatible for 5V p -p Illuminated graticule Internal
100 %9 solid state (except CRT
1x-6 calibration source
0 5 V p -p
High performance/cost ratio
X -Y Vectorscope capability
Protective carrying case and accessory probes

Model 1474-p

FOR PRICING AND TO

PLACE YOUR ORDER
CALL TOLL FREE (800) 645- 9518(outside N.V.

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For N.Y. State call (516) 752 -0050

Master Charge, BankAmericard & C.O.D.'s accepted.

15

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r me

Dual -Trace 5 "30 MHz Triggered Scope

,..,--...,,....,.

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,...,-..,.....

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Dual -Trace 5 -10MHz Triggered Sweep

Model 1471B- p

Model 1403A -p

111=111113111

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High sensitivity CB modulation monitor Ultra

compact ano lightweight (weighs only 81-2 lbs): goes anywhere
New high brightness CAT
Vertical sensitivity 10mV division
and smoked-glass graticule Can be externally triggered
Protective carrying case and accessory probes

Front -panel Vectorscope operation with matched-sensitivity inputs

TTL compatible intensity modulation (Z -axis) input for time or frequency
markers and character displays
Internal Calibration source
100% solid state (except CRT)
Compact. light- weight and rugged
Protective carrying case and
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-c..i...1venut SNat- Hu Yn.-.

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RADIO & TV tubes 36D each. One year guaranteed. Plus many unusual electronic bargains.
Free catalog. CORNELL, 4217 -E University, San
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24nSEC rise time permits display of high-speed square wave pulses

Dual trace display Individual vertical sensitivity and positioning
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Vectorscope operation with matched -sensitivity inputs 19 calibrated
sweep ranges Intensity modulation IZ -axis) input for time or frequency
100% solid stale lexoept CRT)
markers Internal calibration source
Compact. lightweight and rugged
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Dual -Trace 5 " -15MHz Triggered Sweep

F:

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Excellent regulation up to Y, Amp

Kit Includes all components
Drilled fiberglass P.C. Bard
Case Included

This model will power

Amp out-

i\

UNSCRAMBLER

for Digital Clocks

$4.50
Buy 2 for $8.
A. 60 Hz.

output with accuracy comparable to

watch.

B. Directly inlerfaces with all MOS clock

C. Super low power consumption (1.5 ma

Power Supply KIT: SV1 amp reg.

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Kit includes components, PC bard,
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60 Hz. Crystal Time Base

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Same as above but with a

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ONLY 513.95

(All prices subject to change

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D. Uses latest MOS 17

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Plugs Into Mrplrone or external

speaker of any Scanner or Monitor.
Guaranteed to unscramble any

dups.
type.)

stage divider IC.

E
Eliminates forever the problem of AC line glitches.
F Perfect for cars, boats, campers, or even for portable
clocks al ham field days.
G. Small size. can be used in existing enclosures.
KIT INCLUDES CRYSTAL, DIVIDER IC, P.C. BOARD
PLUS ALL NECESSARY PARTS 8 SPECS.

Only $6.50

all.

1085

Easily tuned
Full Inslruclion included
Drilled fiberglass P.C. Bard
One Hour Assembly
Punched Case

1u

MA 1003 CAR CLOCK

INCLUDES SPEC S. AND 3nSWIT HNSL

FREE EDGE CONNECTOONLY,
ITT HIGH LEVEL LOGIC
HOUSE k TTL IC's

7400 TTL DIGITAL CIRCUITS

7400

11

7401

13
13
13

7402
7403
7404
74L04
74504
7405
7406
7407
7408
7409
7410
7411

7412
7413
7416
7420
7421

7423
7425
7426
7427
7428

29

7430
7432
7433
7437
7438
7440

44

7441

13

7442
7443
7444
7446
7447
7448
7450
7451
7453
7454
7460
7470
7472
7473
7474
7475
7476

15

.16
16

.19
.19
13
18

26
.37
15
13
13

25
29
24
19

26

r3

7480

31

23
26
23
23

7481

55

13
76

47
.59
59
68
68
71

13
13
13

.13
19

.27
.25
.29
.29
47
31

7482
7483
7485
7489
7490
7491
7492
7493
7494
7495
7496
74100
74104
74107
74109

57
67
.89
1.25
.65

74121

.29
.48
99
99
1.95
.75

74153
74154
74155
74156
74157
74160
74161
74163
74164
74165
74174
74175
74180
74181
74182
74191
74192
74193
74194
74195
9316
9601
9L04

61

43
43
.67
67
67
30
.49
28
31

74123
74132
74136
745138
74141
74151

301
Dual 5 Input NAND Gate
302 Oued 2 Input Buffer open collector
303
Quad 2 Input NAND Buffer
311
Master Slave F/F
312
Dual JK Flip Flop
321
Quad 2 Input NAND Gate
322
Dual 5 Input NAND Gate
323
Quad 2 Input NAND Gate
324
Quad 2 In pout NAND Gate
325
Dual 2 Dual 3Input NAND Gate
326
Dual 2 Dual 3 Input NAND Gate
331
Dual 5 Input Expander
332
Hex Inverter
333
Hex Inverter
334
Hex Inverter
335
Hex Inverter
342
Dual One Shot Multivlbrator
343
Dual 4 Bit Comparator
370
Quad D Flip Flop
371
Decode Counter
372
Quad Ripple Counter
380
BCE to Decimal Decoder
381
BCD to Decimal Decoder

61

98
89
.89
.55
55
65
65
.85
89
.85
85
.67
1.93
68
98
.79
81
81

69
.85

3/51
.35

61

21
21

74LSO4

28
28

74LS05
74L008
74L509
74LS10
74LS11
74LS13

74L14
74LS15
74LS20
74LS21
74LS22
74LS26
74LS27
74LS30
74LS32
74LS37
74LS38
74LS40
74LS42

21

21

28
21
21

45

99
26
24

28
28
32
32
26
32
32
32
26
65

74L547
74L051
74L054
74LS55
74L573
74LS74
74LS76
74L583
74L085
74LS86
74LS90
74LS92
74L093
74LS109
74LS112
74LS113
74LS114
74LS122
74LS124
74LS125
74LS128
74LS132
74LS133

55
.55
.55
.38
38
.38
.38
.49
.99
.47
.47
.79
.35

74LS160
74LS161
74LS162
74LS183
74LS164
74LS168
74L5169
74LS170
74LS173
74LS174
74LS175
74L5190
74LS191

73
26

.9

74L0136
37
74LS138 .71
74LS139 .71
74LS145 1.00
70
74I-S151
74L5153 .70
74LS155 .89

.73

74LS156

1.35
.36

74LS157
74LS158

26
.26
.35
.35

.70
75

74LS258
74LS260
74LS266
74LS279
74LS290
74LS293
74LS295
74LS298
74LS365

.71

74LS366

.85
.85
.85
.85
1.49
.85
.85
1.69
1.10
1.00

74L5367

Quad
TT 502 Hex Digit Or.
TT 503 Quad Seg. Dr.
tl Or.
TT 5088 Digit Dr.
TT 5098 Seg. Dr.
TT 511 Quad Seg. Dr.
TT 5148 Digit Dr.

.71

26
.26
.55

.75
.61

95

95

9002/7400
9003/7410
9004/7420
9006/7460
9007/7430
9009/7440

74L390 1.75
74LS393 1.45
74L870 2.30
74LS192 .95
74LS193 .95
74LS194
.95
74L195 .85
74LS196 .85
74LS197 .85
74LS251
.85
74LS253
81
74LS257
71

.81

.95
.95

74H05
74H20

.18
.29
29

74H21

29

74H53

74H40
74H50

29
.20

741461

74H72

CD914
CD915
CD4016

CD4017

CD918
C0919
CD4020

C0921

C04022
CD4023

CD924
CD4025
CD4027

.78
.78
.32

CD928

Pos.
Pos.
Pos.
Pos.
Pos.

5V
8V
8V
12V
15V

C0929
CD4030

.95
.95
.19
.97
.97
.97
.19
.75
19

.39
85
.99
.35

C0971

CD4040
CD4041

1.00
.69
CD4042 .69
CD4043
.60
CD4044
.60
C13946 1.39
CD4047 1.50
C0949 .35
CD4050
.39
CD4051 1.19
CD4053 1.19
CD4056 1.15
CD4066
.78

CD4081
CD4507

CD4508
CD4510
CD4512
CD4516
CD4518
CD4520
CD4528
74CO2
74C04
74C107

14

16

^oi

18

28
40

Pin
Pin
Pin
Pin
Pin
Pin

Profile
Profile
Profile
Profile
Profile
profile

Low
Low
Low
Low
Low
Low

.49
.55
.59

ose

t;p0/

2N
2N
2N
2N
2N
2N
EN
EN

10/1.00
10/1.00
6 /1.00
10/1.00

2905 PNP
3904 NPN
3906 PNP
3392 Pre -Amp
4400 NPN
4402 PNP
2222 NPN
2907 PNP

2.80
1.00
1.10
.79
1.10
.69
.85
.45
.32
.79

Originally Cat 53. each

Similar to 2 4513
2

Per Pack

2/51

POWER TRAN.
115W 200V
NPN .95
TIP 29(EP967) NPN
4/51
TIP 30(EP929)
PNP 4 /$1
TIP31 P.C. Leads NPN 5/$1
MJE2370
3 /S1

4 /S1

8/$1
25/51
10151
10151
8151
81$1

2N 3055
TN 2021 By RCA
FET TIS 75 HOUSE

.75
.95
M

5/$1

ELECTROLYTIC

AXIAL TYPE
20MFD 250V

MFD 25V
200 MFD 25V
470 MFD 35V
470 mFp

500 MFD
2000MFD

Bi St
10151

5/$1

Monostable Multivibrator
9962 Triple 3 Input NAND
9951

16V
35V
16V

RADIAL TYPE
MFD 35V PC Leadsl0 /51
MFD 25V PC Leads 8 /S1
330MFD 50V PC Leads 5/51
470MFD 16V
4/51
1000 MFD 35V PC Leads 4 /5l

5151

47

15/$1
5/$1
4/$1
4/51
5/$1

68

150 PFD

3151

MICA

5r

10/51

COMPUTER GRADE

8151

Input Gale NAND /NOR

950 FIF
951 One Shot Multivibrator
1800 (see 934 above)
1806 Quad 2 In t NAND Gate
9093 Dual JK F/F
9094 Dual JK F/F
9097 Dual JK F/F
9099 Dual JK F/F
9109 Hex Inverter
9110 Hex Inverter
9112 Hex Inverter
9601 One Shot
9930 Dual 4 Input Ext. NAND
9932 Quad 2 Input NAND Buffer
9945 RS F/F
9946 Quad 2 Input NAND
9949 Quad 2 Input NAND

.19
.19
35

4.95
8.50
8.95
12.95
8.95
1.25
2.50

CAPACITORS

1011.00

948JKF /F

295

INTERSIL DUAL TRANSISTORS

GENERAL PURPOSE

prima

10 /1.00

11

3.75
3.75

are

Darts

DTL

946 Quad

$4.99

TRANSISTORS

I
.20
.22
.25
30
.69
.89

35

39
.39

51.50
1.25

3.57945

1151

945JKFIF
74H73
74H74

Clock Chip
Clock Chip
Alarm Clock
Alarm Chip
Direct Drive Clock Chtp
4 Digit Counter w/ Latch
4 Digit Counter
6 Digit UP /Down Counter
6 Digit Elapsed Timer
Calculator Chip w/ Specs
Cal. Chip w /sg. rt.

SOCKETS
8

pure
Darts

932 Dual 4 Input Buffer

934 Dual 5 Input NAND Gate
941 One Shot Multivibrator

29
.25
.45

MK50252
MM5316
MK50250
MK50380
FCM7010
MK5005
MK5002
MK50395
MK50397
CT5005
MK5021

13

.13
.18
.18
.18
.18
25
.22
.22
30
.39
39
39

o46

300 KHz

COUNTER AND CLOCK CHIPS

8 /1.00
9024/74109 3/1.00
9300/74195 311.00

CMOS
CD400
.19
CD4001
.19
CD4002
.19
CD4006 1.20
CD4007
.19
CD4009
.47
CD910 .39
CD911 .19
CD912 .29
CD4013 .32

.49 V4a

CRYSTALS

/1.00
6/1.00
3/1.00
3/1.00
6

House Number TTL.

15

.18
.18
.13

9018/7404

74H SERIES TTL

74H00

have

.49

10/1 00 Please specify 7437

10/1.00
7438
that you
10/1.00
74141
10 /1,00 are ordering 74153

7408
7420

.18
.18
.18

TTL SPECIAL!

.55
55
.55
.55

74LS368

7400
7404

15
18
15

ITT MOS TO LED DRIVERS

74LS00 LOW POWER SCHOTTKY

74L500
74LS02
74LS03

$19.95

1,900 MFD35WVDC (Mini) 3/52 68 PFd 50V 680PFd

50V
8,000 MFD 15WVDC 95 cents each 100 PFd 100V .001 Fd
33,000MFD4OWVDC $4.00 Each 150PFd 50V .002 MFd 50V
220PFd 50V .01 MFd 200V
330 PFd 50V .02 MFd 200V
.001 UFd500V 3.3 PF 500V
TANTALUM
.0015 UFd500V 4.7 PF 500V
MFD20 WVDCPC Leads 15/51
005 UFd500V 8.2 PF 500V
3.3 MFD35 WVDC PC Leads 8 /S1
100PF 500V
4.7 MFD10 WVDC PC Leads 5/1
10 MFD20 WVDC PC Leads 8 /$1
PC Leads 25/89 cents No Mix

8 /51

8/51
10/$1
5/$1
10 /$1

10/$1
8/51
8 /$1

8/$1
8/$1
7/51

33MFD1OWVDC

7151
7/51

22 UF10

6 /51
10 /$1

Long Leads 25/89 cents No Mi r

3 /$1
8 /$1

RTL's BY FAIRCHILD

8/51
8/$1

The most popular digital IC's ever

produced Very hard to find!
UL
DUAL 2INPUT NOR
.99
UL923
JK FLIP FLOP
$1.19

8 /$1
8 /$1

8/$1
8/$1

VOLTAGE REGULATORS
7805
7806
7808
7812
7815

1
1
1
1
1

Amp
Amp
Amp
Amp
Amp

99
.99
.99
99
99

7818
7824
7905
7912
7915

Pos.
Pos.
Neg.
Neg.

Neg.

Amp .99
Amp .99
Amp 1.10
Amp 1.10
15V Amp 1.10

18V 1
24V 1
5V 1
12V 1

723 VOLTAGE REGULATORS

89c

logprice -5400eachl With specs.

BRIDGE RECTIFIERS
Amp 200V
Amp 50V
Amp 50V
Amp 50V
25 Amp 50V
1
1

10

MOTOROLA VOLTAGE REGULATOR

MC1469R. TO -66. 9 leed package for 3 to 30V outputs. Provides 600 MA direct output or more by
using an external power transistor Regular cata-

Output voltages variable from 2 volts to 37 volts.

A very versatile and popular device. -14 PIN DIP.

$1.95 each

DIODES

6/51
5.90
1.10
1.25
1.39

IN 4002 1 Amp 100 PI V 40151

IN 40041 Amp 400 V
15/51
IN 40071 Amp 1000 V
10/$1

GERMANIUM DIODES
IN 54A

8 /S1

15270

10/51

ZENER DIODES

HOUSE MZENER

4.7V

N
N

746 3.3V 400M 4/$1

752 5.8V 400M 4/$1
1958 8.2 V 400M 4/$1
N 5259 39 V 500M 10/S1

N5271 100V 500M10/$1

N 5280

500
V 500

MW
MW

10 V 1 Watt
15 V 500 MW
22 V 5 Watt

SWITCHING DIODES

101$1
10151
8 /S1

IN 4148/10914 Long Leads20 /S1

IN 4148/IN914 Cut Leads 40/$1
IN 41 48 /1 591 4 PC Leads 100/51

10/1
8 /S1

180 V 500M1031

LINEARS
709
710
711

712
749

LM 301
LM 307

Operational Amplifier
Differential Comparators
Dual Differential Comp

.25
.40
.35
.25

Hall Adder
Stereo Pre -Amp by Fairchild 2/51
Operational Amplifier
.30
Operational Amplifier
30

LM
LM
LM
LM
LM
LM
LM

Operational Amplifier
95
309K 5V Lamp Regulator
1.49
710
Voltage Comparator
.25
311
Voltage Comparator
85
318
Operational Amplifier
t 15
723
Voltage Comparator
69
324
Quad Operational Amplifier
308

RADIO HUT
P. 0. Box 38323

Dallas, Texas 75238

LM 377
LM 3900
LM 741
LM 748
NE 553

NE555
NE 556

Dual 2W Amplifier
Quad Op- Amplifier

Operational Amplifier
Operational Amphher
Quad Time/
Timer
Dual Timer

85

25
25
1

95
40
95

1-800-527-23011

Use Our Toll Free Watts Line

For Master Charge and BankAmericard Orders

CIRCLE 88 ON FREE INFORMATION CARD

www.americanradiohistory.com

NE 567
1458
75491
75492
3043
8038

Tone Decoder
Dual Op -Amps il ter
Ouad Segmenl Driver

Hex Digit Driver

IF

Amplifier

Voltage Cont. Osc.

25
55
35
.35
75

3.95

Sag

S. D. SALES CO
C

ORDER BY PHONE CALL TOLL FREE

EXPANDO RAM KIT

PROTECTION
8K, 16K, 24K, 32K using Mostek MK4115 with 8K boundaries and protection. Utilizes
DIP switches. PC board comes
with sockets for 32K operation.
Orders now being accepted.
Allow 6 to 8 weeks for delivery.

II

3. Selectable wait states.

4. On board regulation provided.
5. All sockets provided w /board.

is 500ns.

Buy an S100 compatible 8K Ram Board and upgrade the same board to a maximum of
32K in steps of 8K at your option by merely purchasing more ram chips from S.D.
Look at the features we have built into the board.
Sales! At a guaranteed price
PRICES START AT $151. FOR 8K RAM KIT
Add $108.00 for each additional 8K Ram

Z -80 CPU BOARD KIT

8K LOW POWER RAM

$139.

CHECK THE ADVANCED FEATURES OF OUR Z -80

CPU BOARD: Expanded set of 158 Instructions, 8080A
software capability, operation from a single 5VDC power
supply; always stops on an M1 state, true sync generated
on card (a real plus feature!), dynamic refresh and NMI
available, either 2MHZ or 4MHZ operation, quality double
sided plated through PC board; parts plus sockets priced
for all IC's. 'Add $10 extra for Z -80A chip which allows
4MHZ operation.
Z-80 chip with Manual
S39.95

Fully assembled and tested.

Not a kit. Imsal
Altair
S-100 Buss compatible, uses
low power static 21L02 -50Ons
fully buffered on board regulated, quality plated through PC
board, including solder mask. 8
pos. dip switches for address
select.

-800- 527 -3460

KIT FEATURES:
1. All address lines & data lines buffered.
2. Quality plated through P.C. Board, including solder mask and silk screen.

IS 375ns.

Memory Cycle Time

16K or 32K EPROM $49.95 w /out EPROM

Allows you to use either 2708's for 16K of
Eprom or 2716's for 32K of Eprom.

INTERFACE CAPABILITY
Control, data and address inlow
power
puts
utilizes
Schottky devices.
POWER REQUIREMENTS
+8VDC 400MA DC
+ 18V DC 400MA DC
-18VDC 30MA DC
or, board regulation is provided. On board (invisible) refresh
is provided with no wait states
or cycle stealing required.
MEMORY ACCESS TIME

MEMORY CAPACITY
MEMORY ADDRESSING
MEMORY WRITE

WE CAN SUPPLY 450ns 2708's AT $11.95

WHEN PURCHASED WITH BOARD.

4K LOW POWER RAM KIT

$159.95

--

--

Perfect for cars, boats, vans, etc.

PC board and ail
(less case) Inc.
Alarm option
$1.50
AC XFMR
$1.50

Features: Large LED 1/2" displays

oper. from 0.1 sec. to 59 min.
59.99 sec. 5A -115V. Relay Included to
control appliances. Operates on 115V
AC. Displays can be turned off for total
darkness while counting. All necessary
parts Included.
Special design case $3.75.

Features: Litronix dual 1/2" displays, Mostek

50250 super clock chip, single I.C. segment
driver, SCR digit drivers. Kit includes all necessary parts (except case). Xfmr optional.
Eliminate the hassle.
AC XFMR
$1.50 Case $3.50

Bowmar 4 Digit LED Readout Array

Full 1/2" Litronix Jumbo Dual
Digit LED Displays
$3.95

DL728 -C.C.
DL 727 - C.A.

99c

$1.29

The timers can be used independently or coupled.

The timer can be set to 59
minutes 59.9 seconds at 0.1
intervals. Kit includes all
necessary parts and an attractive woodgrain case.

FLAT PACK

RAM'S
8/11.50

21L02-500NS
21L02-250NS

8115.95
14.95

2114-4K

1103-1K
1101A

8/54.00

256

15.45

$44.95

Features: Large
50397 counter display /driver, counts up to
59 minutes, 59.99 seconds with crystal controlled 1/100 second accuracy, operates on
115V AC or 12V DC supply. All necessary
parts included. Special design case $3.75.

Low Cost Cassette

P.C. LEADS
15

for 51.00

IC ASSORT.
FLAT PACK 5400

Complete Kit
2

13T TYPE
IST TYPE C
YOUR CHOICE

AUDIO
amt. W/ Specs
6/S1

12/S1

TRANSISTOR

DISC CAPS
FOR BYPASS

CPU'S
-80 includes manual

29.95
34.95
11.95

Z -80A includes manual

8080A CPU BIT
8008 CPU BIT

695

PROMS
3955r10/35.

1702A - 1K - 1.5us
2708 - 8K intel - 45005
5204 - 4K

14.95
7 95

825129-1K

250

27085 8 8K Signetics 650ns

9 95

.01 MFO -100

WVDC. PC leads.
40/81.

...

...,....

Use In TV Sets. 1.2

uh 5% and 1.5 un

631

12/31

20K,

10K,

Photocell Asst.
We bought almost
200K from a big US
mfg. Three product
families:
mall.
and dual
medium
photocells. Perfect
for all light sensitive applications.

Originally used in

12151.00

PLASTIC READOUT FILTERS

desk top calcula.
lors. Perfect for use
with LED and cane,
type readouts.
AMBER
for Sr

-S

1.5

-20 P.F

P.C. Mount
4

/5f

NEW CAMBION
JACKS
PART 450 -4352

TTL ASSORTMENT
Contains a high
yield of usable pans.
50/51.50

RESISTOR
Special!
Ohm 1 Watt.
Carbon Comp. 10%.
Handy value. Parallel to make low ohmage power resistors.
Help! We bought
100,000 pieces!
25 for S1.
22

*
$1.95

New
Series 2300
The Wo id's Smallest
Coded BCD Dual -In-Line
Switch! PC Mount
2300 02G BCD 1 -2 -4 -8
2300 12G BCD -2 -4 -8

Gold Plated
50/81

12151

MICRO -DIP
MICA TRIMMER
PC 402 Miniature

AUTO COIL
TRANF.
Ideal for Inc saper.

8212
8214
8216
8224
8226

OHM. Mlnl for PC

boards.
YOUR CHOICE
10/51.

DISC CAP ASST.

JOY STICKS
FOUR 100 K -OHMS
POTS
0
Ideal for

electronic
games

SILICON
RECTIFIER
Spacial!
1N4007 t AMP
1000 PIV.
PRIME UNITS

---

350

port
P.I.C.
Non Invert Bus
Clock Gen..
Invert Bus

12.95
..

.. 4.95

for Z -80
CTC for Z -80
8228 Sys. Controller
8251 Prog. Comm. interface
8255 Frog. perp. interface
8820 Dual Line Recr
8830 Dual Line Dr
2513 Char. Gen
...
8838 Ouad Bus. Recvr
1/8 decoder ....
74LS138N
8797 -Hex Tri -Slate Buffer
148811489 RS232
TR 1602e Uart

14.95
14.95
8 20
10.95
13.50

1031.

P.C. LEAD DIODES

1N41a811N914

4 95
3 95

75
75

1
1

7.50
2.00
99

25

50
95

Z -80 PROGRAMMING

-100152.00
1N4002 -1A

Includes 001. 01,

.05 plus other standard values.
00/51.00

-IlO

PI O

PC leader At least
10 different values,

:WIIILillllr

MICROPROCESSOR
CHIPS

25K

10 %. Your choice.

MANUAL

100 PIV

40181.90

DETAIL OF
THE Z -80 CPU
MICRO-COMPUTER

IN DEPTH
STANDARD
ANT. TER.

Used for Ant. Hook.

up on all TV Sets.

S.D. Sales Special

$9.95

1211

$3.95 *
'Choose $1. Free Merchandise From Asterisk Items on each $15 order!

IN YOUR BANKAMERICARD (VISA) OR MASTER

CHARGE ORDER IN ON OUR
CONTINENTAL TOLL FREE
WATTS LINE:

STANDARD COILS

COUNTER CHIPS
MK50397 6 Digit elapsed timer, ... 8.95
4.99
MK50250 Alarm clock ..
2.95
MK50380 Alarm chip
MK503966 digit up /down counter 12.95
... 695
MK5002 4 digit counter
.... 2.50
MK5021 - Cal chip sq. root

BALUM
Used In TV Tuners
Can be rewound
for Ham freq.

e_

81
-.1111I

Features: K.C. standard 2400/1200 Hz, 300 Baud, TTL, I/O

compatible, phase lock loop, 22 pin connector. Feeds serial data
via microprocessors I/O ports and from cassette tape recorder.
$14.95

TRIMMER POTS

ELECTRICAL COIL

SERIES. SPECIAL
BUY FROM ITT.
20 Assorted
Devices for 51.00

Uz

$14.95

$79.95 `L

n,p1

IIW1

Interface Kit

395

745200-256

CALL

TANTALUM CAPS
MFD.20VDC-

35

MK4115-8K

THERMISTORS
NEW!
MEPCO
1.5K OHM
6 /S1.00

LED1 /2" displays, Mostek

1/2" LED DISPLAYS

JUMBO .50" DIGITS ON ONE STICK!

WITH COLONS & AM /PM INDICATOR
DL722 -C.C.

6 Digit General Purpose or

$29.95
Computer Timer Kit

NEW COMPETITION CHESS TIME KIT

WITH TWO INDEPENDENT FIVE DIGIT

DL 721 8 C.A.

$16.95

Features: Litronix dual 1/2" displays.

Uses Silicoaix LD131 single chip CMOS
A/D converter. Kit includes all necessary parts (except case); AC line cord
and power supply included. 0-149 F.

5 Digit Countdown Utility

Darkroom Timer Kit

DIGIT ALARM CLOCK KIT

--

A. Bowmar Jumbo .5 Inch

50250
Super clock
B.
base.
C. On board precision crystal
Real
D. 12 or 24
E.
F.

The Whole Works - $79.95

DIGITAL LED READOUT
$29.95
THERMOMETER

LED Car Clock Kit

- - Jumbo
FEATURES:
- LEDtimearray. chip. I(Mp
MOSTEK hour
Time format.
parts

on board regulated
reduced power consumption utilizing
low power 21L02
1 500ns
RAMS
Sockets provided for all IC's. Quality
plated through PC board. 'Add $10. for
250ns RAM operation.

Fully Buffered

MUSICAL HORN

$6.95
One tune supplied with each kit. Additional tunes
each. Special tunes available. Standard tunes now available:
Yankee Doodle
On Wisconsin
Dixie
Eyes of Texas
Pink Panther
Aggie War Song
Notre Dame
Dandy
Yellow Rose of Texas
Anchors Away
Never on Sunday
Boomer Sooner
Bridge over
Deep in the Heart of Texas
River Kwai.
HOME KIT
Special Design
CAR S BOAT KIT
Case $3.50
$26.90
$34.95

VISA

S.D. SALES NEW

EXPANDABLE EPROM BOARD

8K FOR $151.00

32K FOR $475.00

AN EMPIRE IND. CO.

DALLAS, TEXAS 75228

P.O. BOX 28810

Compliment

Texas Residents Call Collect:

rains - 60 Day
1-800-527-3460
,Hoge, Hack Quarantee!
DIALER INQUIRIES INVITED!
214/271 -0022

CIRCLE 69 ON FREE INFORMATION CARD

www.americanradiohistory.com

NO COD's. TEXAS RESIDENTS ADD

5% SALES

TAX. ADD 5% OF ORDER

FOR POSTAGE & HANDLING

OR
DERS UNDER $10. ADD 75c HAND
.

LING.FOREIGN ORDERS
FUNDS ONLY!

U.

II

I 88NN

II

ECONORAM VI ECONORAM

IItM

12Kx8 memory kit

for the Heath H8

YES,YOU CAN

UILD
AN

$235.00

We proudly welcome our newest memory

board family member, designed from the
ground up for full compatibility with the Heath
Company H8. Organized as two independent
blocks, one 8K block and one 4K. Has the
same basic features as our ECONORAM
IITM -all static design, switch selected protect
and phantom, sockets for all ICs, full buffering -plus the required hardware and edge
connector to mate mechanically with the H8.
You can have our 12K board for the price of
the Heath Company's 8K ... with the performance you've come to expect from products carrying the ECONORAMTM name.

Selected computer kits

10 SLOT MOTHERBOARD (S90; 18 SLOTS $124) These S -100
motherboards come with edge connectors and active termination circuitry.

ACTIVE TERMINATOR ($29.50) Plugs into

motherboards lacking active termination; cleans up the glitches associated with

unterminated lines.
S -100 buss

ELECTRONIC
ORGAN

u.

Popular 8K x 8 memory plugs into Altair.

IMSAI,other 5.100 machines. Two independent 4K blocks with separate protect and vecfor interrupt provision if you try to write into
protected memory. Handles DMA devices.
Fully buffered. Tri -state outputs. Selectable
write strobe. Sockets for all ICs. Join the
thousands who have made this our most
popular board!

$44.50 brings you crowbar

over

voltage protection, current limiting, output protection, and easy assembly. Use
with ham, CB, automotive equipment
when you need hefty AC power. Less
case, hardware.

BOX 2355,

GODBOUT ELECTRONICS
OAKLAND AIRPORT, CA 94614

TUBES, receiving and Industrial, semiconductors, factory boxed, low prices, free price list
TRANSLETERONIC INC., 1365
39th Street,
Brooklyn, NY 11218 212-633 -2800

ECONORAM Ill

1
The first 8K x 8 dynamic RAM that performs well enough to merit the ECONORAMTMname. Not a kit- assembled, tested,
ready to run in your S-100 machine. (Altair
etc.). Low power. Configuration as 2 separate
4K blocks. Zero wait states with 8080 CPU.
Includes 1 year warranty
$149.00

II

$79.95

$2.96

Transmit
upSen ulve make

on

],1,7

la.

TONE DECODER KIT

complete lone decoder one single PC
Board. F.Mure,. 400 to 5000 Hz edluetable
hequency range, voltage regulation 56710.
Useful for touch-lone decoding, tone burst
A

Fax tlen,od, eignwin9, end many

se. leer r fol 12 butas toucnlone de

o wnpsune on 515

12

voie.

Complete Klt. TO -1

54.95

LED

BLINKY KIT

fir

great attention gelA

es^limbs
MS
LEus

Use for

buttons or warning
type

Peal lights.

complete Kh. BL.t

SUPER-SNOOP AMPLIFIER
super-sensitive
drop et15 bell Greet for monitoring
purpose

ameplPlerrrFull 2 welts Sou el

12 volts, uses any We of mike

an 6

Requires 045

ohm speaker.

Complete KIt, 55.9

MUSIC LIGHTS KIT

with music orwvviceal055 light Is,

Lowe. one for the

sighs

mld+m

ee

and one for t

uchannel cassa. Greet or

and
l

music me clubs
Complete Klt. ML -1

p45154

wed mors.

$7.96

SIREN KIT
Prodvwe vpwwa ene eownwwe wail cn.r.
on.
dio
of
3-9
nm
put.
10
e.
845 ohm

$2.85

Complete Kit. SM -3

CODE OSCILLATOR KIT

Powerful 1 wall audio oecitiwor of .porcs I
Hz good for many uses. Great for warning
alarm, battery checks voltage) locator and
code oscillator.

Complete Kit. CPO -1

52.50

POWER SUPPLY KIT

ComPlela

tttpkrp ul

eepower5oP06rro-

idee variable

Y15

n:,npn

$li$O0 m

Requiroe 68V el

Below wholesale prices on a full line of antenna

installation surplus shipped from stock- Unbelievable prices on connectors, wall plates,
splitters, transformers, amplifiers, etc. Write
for free catalogue. Order now & compare.
TASCO. PO Box 30143 Houston Tex 77009

KIT

You've requested it, and now it's here! The CT -50 Frequency Counter Kit has more features than counters selling
for twice the price. Measuring frequency is now as easy as
pushing a button, the CT -50 will automatically place the
decimal point in all modes, giving you quick, reliable readings. Want to use the CT-50 mobile? No problem, it runs
equally as well on 12 VDC as it does on 110 VAC. Want
super accuracy? The CT-50 uses the popular TV color burst
freq. of 3.579545 MHz for time base. Tap off a color TV with
our adapter and get ultra accuracy
.001 ppm! The CT -50
offers professional quality at the unheard of price of $79.95.
Order yours today!
CT-50, 60MHz Counter Kit
$79.95
CT -50WT, 60 MHz counter, wired and tested
$159.95
CT-600, 600 MHz prescaler option for CT -50, add
$29.95

UTILIZES NEW MOS -LSI CIRCUITRY

SPECIFICATIONS
Sensitivity: less than 25MV
Frequency range: 5Hz to 60MHz, typically 65MHz
Gate time: 1 second, 1/10 second, with automatic decimal
point positioning on both direct and prescale
Display: 8 digit red LED .4" height
Accuracy: 10 ppm, .001 ppm with TV time base!
Input: BNC, 1 meg ohm direct, 50 ohm with prescale option
Power: 110 VAC 5 watts or 12 VDC 1 Amp
Size: Approx. 6" x 4" x 2 ", high quality aluminum case
Color burst adapter for .001 ppm accuracy available in 6
weeks. CB -1, Kit
$14.95

$4.95

ems.

See

INTO TV ANTENNA SYSTEMS?

YOU'LL BE INTO TASCO!

II

II

62.96

III

Frequency
Counter

FM WIRELESS
MIKE KIT
FM -1

la

FREE FLYER: We carry many items of interest to all elec-

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SEEKING Japanese Transistors for CB and stereo repair? Request complete list. Compare 1 to
9 prices: 2SC710 -59, 2SC517 3.95, 2SC799 3.60,
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45240

tronic hobbyists. Send us your name and address, we'll

II

5872 Amapola Dr.

San Jose, CA 95129

562.0636, 24 hours.

MINI -KITS

FM

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ranted for 1 year $150; SPECIAL - Four

ECONORAM IITM kits $475 (32K
memory)

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crystal or ceramic m

BROCHURE AND DEMO RECORD $1.00

TERMS: Please allow up to 5% for shipping; 110% for 12V supply); excess refunded. Cal res add tax. COD orders OK with street
address for UPS. VISA. /Mastercharge orders call (415)

D0
BILL

PIPE ORGAN SOUND

Kit form $130; assembled, tested war- ME

12 Volt, 8 Amp Power

Supply Kit

Thathasa

With DEVTRONIX easy to build assemblies.

Own the ultimate in organ design & sound
at
the cost of commercial organs.
Several models to choose from,

volte el

206ne

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amp and t0 to 30VC7.

Complete Kit. PS -3L7

56.95

DECADE COUNTER PARTS KIT

Giudea' I190A 33 MHz enumera Iernlelcn,
I EO dover- LEO readout, current Ilmil
rs, nook up dwwla Intl Inalructtone on
allo en eery low wet Ireq. w
Lt o/ Parte, DCU -1
$3.60

VIDEO TERMINAL
KIT $149.95
A compact

5 x

SIX DIGIT

lsi

12/24 HR

10 -inch PC card that requires only an ASCII key-

board and a TV set to become a complete interactive terminal for

connection to your microprocessor asynchronous interface. Its
many features are single 5-volt supply, crystal controlled sync and
baud rates (up to 9600 baud), 2 pages of 32 characters by 16 lines,
read to and from memory, computer and keyboard -operated cursor
and page control, parity error display and control, power -on initialization, full 84-character ASCII display, block -type see -thru cursor. Keyboard /computer control backspaces, forward spaces, line
feeds, rev. line feeds, home, returns cursor. Also clears page,
clears to end of line. selects page 1 or 2, reads from or to memory.
The card requires 5 volts at approx. 900 ma and outputs standard
75 ohm composite video.
TH3216 Kit
TH3216, Assembled and Tested
VD-1, Video to RF Modulator Kit

$149.95
$239.95
6.95
S

600 mHz
Prescaler

1a0

CLOCK KIT

Want a clock that looks good enough for your living room?
Forget the competitor's kludges and try one of ours! Features, jumbo .4" digits. Polaroid lens filter, extruded aliminum case available
in 5 colors. quality PC boards and super instructions. All parts are
included, no extras to buy. Fully guaranteed. One to two hour assembly time Colors: silver, gold, black, blue and bronze (specify).

Clock Kit, DC -5
$22.95
Alarm Clock, DC-8, 12 hr. only
$24.95
DC -5 with 10 min. ID timer
$25.95
Mobile Version, DC -7
$2585
Assembled and tested clocks available, add
$10.00 to kit price.
741 MINI DIP. house marked

Fully assembled and tested.

Extend the range of your counter to 10 times higher In frequency.
Works with any counter. High sensitivity input with built-in on-chip
pre -amp.
PS- 18, -10
.. $59.95

a:

rame sedan
web:ante

Minimum ender 54.00

10/52.00

atisfaction guaranteed or money refunded. Orders under 610

add
add 75c. C
00. NV add 7%
Sr

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www.americanradiohistory.com

LINEAR
555
556
566
567
324
1458
380

.50
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1.49
1.49

1.49
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1.49

CAR
CLOCK

KIT $27.95
224-Hour 12 -Voll AC or DC
Nigh Accuracy (1 mmuteynonthl
6 Jumbo a" LED readouts
Easy. no- polarity hookup
Display blanks with ignition
Case, mounting bracket included
Super instructions
Complete Kit. DC- 11........... 627.95

REGS
309K
.99
340K -12 .99
7805
.99
7812
.99
7815
.99
78MG
1.50
723
.49

AUTO -pMMEa
15.60
autonmicaey adiu,n
smarting
0C

ce, Clock

I'

TRANSISTORS
NPN 2N3904 type
PNP 2N3906 type
NPN Power Tab 40W

PNP Power Tab 40W

FET MPF-102 type
UJT 2N2646 type
2N3055 NPN Power

10/$1.00

1081.00
3/$1.00
3/$1.00

382.00
382.00
.75

ramsaU aIacfrmics
BOX 4072B

ROCHESTER, NY 14610

17161 271

-6487

)7; -3

Fantastic new design uses CMOS I.C. and a total of 39 semi -conductors to give a touch con trot keyboard, all the electronic parts in one PC
Board. This organ is easy to build, yet has fea
tures like a full two- octave range touch keyboard, variable tremolo; two voices; built -in I.C.
amplifier with volume control, complete with
speaker and a specially designed plexi -glass

ti

MO

COMPUTER RECORDING
All these tapes made in U.S.A.
by a top cassette tape Co.
Never Recorded -Reg. $6.80 ea.
3 packs/$5.00
Can be used in Audio

All pens completed on s PC Board

SCR will turn on relay, busier or trigger other
r uit for 2 _ 10 sec. ladlustablal
as door alarm, sound controlad toys
and many other protects
Supply voltage
9V D.C.
51.75 ea. /2 for $3.00

Sub-Mini Size

SIGMA 7BREI, 12DC RELAY

4008 COIL SPOT
$1.30 ea. or 10 for $10.00
ALL BRAND NEW UNITS

Diode protected for over voltage input

MECHANICAL DIGITAL CLOCK

with % and memory

Digits big green display
'Built -in X'tal controlled stop
watch count to 1/10 of a second.
Special Price Only
$16.50 Ea.
8

Supply Voltage 110V AC. limited quantity $15.50 ea

QUARTZ CRYSTALS

AUDIO AMP

MHZ
MHZ
4 MHZ
10 MHZ
3.579 MHZ
Color TV Type

All parts are pre assembled

on a mini PC Board
Supply Voltage 6^-- 9V D.C.
SPECIAL PRICE $1.95 ea.
Mpn,leted
aPC
LM380 I.C., voNme,
bass, treble control included
15V D.C.
Supply voltage: 9
Sensitivity. 100Mv for full output
Total harmonic. distortion'.
1 %@ 1 KHZ@ 1.5 watt
Output is short circuit protected

MODEL
ST

+2

ONLY $5.75

ea.

5W AUDIO AMP KIT

2

LM 380 with Volume Control

Power !. !ply 6-18v DC

DCnF'an
Output 1.5 SW
MHZ

711955
Alternative AY3 8500
6 Game l28 Pin Dipl
TV Game Chip with Data
1

100sec.
time delay

Tennis Squash hockey.

practice &

sip

$11.50 each

ELEcTRON,c ,c T,MEle

ELECTRONIC ALARM SIREN

COMPLETE UNIT
as an Alarm Unit.
Or hookup to your car back up
to make a reverse indicator
Light Output up to 130 dB.
Voltage Supply 6 -12V

shooting

Board for TV Game with Data $2.50

Switch Box between Game & TV 01.25

PC

let

ea
ea

RCA STEREO AM -FM

MUX TUNER AMP

-999

19 KEY HEXADECIMAL
1

-0

KEY PAD
Homekey
16 Key Pad

Designed for Calculator

Can be used Ior Computer

Data Entry Pad or Digital Lock
All key tops blank witn super
good touch feeling
$0.95 ea.

DIGITAL ELECTRONIC LOCK KIT

400 w

for auto ignition, entry

burglar, alarm. etc.
$6.50 ea, door,
4 Digits Programable to
M OS I.C.
Any Combination
N CIRCUIT
RELAY AND KEY AO NOT INCLUDED

MATCHES, PAIR

ONLY $53.50 ea.

ON- SCREEN TV

CLOCK KIT

Radio
Electronics. Kit includes PC
Board, MM5318 and MM5841
chip. All other electronic parts

Same

one

Built in X'TAL controlled

time base. Protected against
automotive volt transients.
Automatic brightness control with 0.3" green color
display. Display turnoff
with ignition OFF ".

as

in July

with transformer.
ONLY $21.00

at 15 amp
3 amp
CT at 2 5amp
CT at 25amp
12 V o r24 V at
2 amp
24V
CT at 800MA
0.8V - 12V at 400MA

CT.

36V
50V
48V

$30.00
S 4.50
S 4.50
S 4.50
$ 3.90

150UA METER 7-, IAonly

ZD7/%
Jumbo Size red /green change color
L.
eaa. li
when reverse polarity of voltage.
ea.
$1.50
Ideal for go /nogo indicator.
Two for $1.00

LJ

$2.75 per pair

new in box.

e2

2v.

00
20

Only 53.80

i]7

on

spo,
DPDT
3POT

S+

st3o..

,50:.

OnOft

on Du

114
11

ea

AluA.,aTauirathesa,

eP

.10V STICK
4

COOK V

enly $5.50

iu

y to

',-'0%,09:7,:s,

pot

one

engte

of
hee
or motel re

PUSH - SUTTON SWITCH

N /Open Contact
Color: Red, White, Blue,
Green, Black.
4/$1.00
N /Close also
Available
504 ea.

LARGE OTY AVAILABLE

SOLID STATE ELECTRONIC BUZZER

Site
x3 4 ".3 4'
tage
5v 120
o letal
Alarm
or Tone Indicator
1

ea.

$1.50 each

MINIMUM ORDER $10 00 Caltornie residents add

All orders

0.90
1.10

AVAIL

SWITCHES

A A

First designed for

tel
Finder. Scaled from O ma 10
but can be erased and your
ovvn cale put on too. Brand

Some as the E-Z clips

With 20" Long Leads
In Black and Red Colors

FOR OEM

50 UA PANEL METER

I.C. TEST CLIPS

DPOT

SUBMINIATURES TOGGLE

ea.
ea.
ea.
ea.
ea.
ea.
ea.

B
0

090

SPOT

LARGE QUANTITY

180
180
AC POWER SUPPLY
Adapter TYP. Transformer
12V AC Output 200 MA
$2.75 each
6V DC Output 130MA $1.90 ea.
8.7V DC Output 130MA $1.90 w.
12V DC Output 100MA $1.90 as.
$
$

of submtnt toggle switch

amp 125V AC contact
1-9 10 99

MS 244
MS 245

ALL 117 VOLT INPUT

30v

S2a32P SPST

MJE3056
90 WATTS

60 POLT

BIPOLAR LED

30V DC Panel Meter $4.20

MA1003, 12V DC CLOCK MODULE

TRANSFORMERS
Watt Per Channel RMS With
8 Track Tape Player Built In
Manufactured by RCA, maker of
Quality Systems. All Solid State
Circuitry with Beautifully detailed
panel. Limited Quantity.
5

POWER SUPPLY KIT

0.30V D.C. REGULATED

Uses UA723 and ZN3055 Power
TR output can be adjusted from
0 -30V, 2 AMP. Complete with PC
li
n
board and all electronic parts.
p
$9.50 each
Transformer for Fewer Supply, 2 AMP z4V x 2 $4.50 ea.

MINI -MINI

TOGGLE SWITCH

$2.25 PER PAIR

H--Key
SPECIAL $10.50 ea.

Low Cost Hexadecimal

Sub Mini Size

PANEL METER
500 UA
ONLY $1.20 ea

10 AMP

ABCDEF

ea.

Only $8.50

POWER TRANSISTORS
MOTOROLA MJE2955 PNP

Ideal for use

Au

eo.

a box of matches!!
Receives all AM stations
Batteries and ear phone included

WIRE
WRAPPING
TOOL
$29.50
Wire Wrapping
In Bulk
100'
$2.00
500'
$8.50

Special Only $6.50

unit for burglar alarm, photo

PT

MHZ

ONLY 54.50

1-

as

Chit, PC Hoa,des
Coto,
Readouts
Duvets en,

SIe smaller than

Signal to RF Signal

TIMER KIT
Ideal to be used

Handball.

Auto counter display on

This umt convent the V,d.n

I

Ple

MINI -SIZED I.C.

AM RADIO

the screen.

Por TV aam. or Computer

Fro, Adjustable

CASI "

Vs

Spacial Only S14.95

PdnenH

4 Games- Tennis, Hockey,

Racquet Handball and Sin -

$5.50 tech

via Id
Video

Coto,

6(

Ail

wATURBt
91e

lne,idxs

M5314 Cum,

$19.50

VHF MODULATOR

only $5.00era.

service, and other purposes.

Max. loading 110V, 2 AMP.
Supply voltage 12-18V D.C.

Fit

Sais Only

CONDENSER TYPE
Touch on Touch Off
use 7473 I.C.
and 12V relay

Time Controlled from

WITH a NI

SWITCH KIT

MFD 12V
MFD 6V

CLOCK KIT
MOST POPULAR
MM5314 KIT

Blast

ELECTRONIC

2W + 2W STEREO AMP
All parts
on
Boar

$2.20 ea.
$3.25 ea.
$3.95 ea.
$4.25 ea.
02.00 ea.
$3.50 ea.

M F D 50V

TV Games

$4.95
$5.25
$5.25
$5.25
$1.25

MFD60V
MFD50V
MFD75V

5.600
10,000
11,500
34,800
39,000
100,000

autawly designed case is mode

n 9M1 Pity di cast alloy. Movement is
e popular 9 No type with aback up liynt.

BATTERIES NoT INCLUDED

1w.tt

COMPUTER GRADE CAPACITORS

WITH DAY AND

DATE OF THE WEEK

6 Functions

3e,

Condenser Microphone
$2.50 each
FET Transistor Built -in

50

CALCULATOR
with STOPWATCH

well.

Ideal for

state
of
LSI circuitry. This new technology approach to instrumentation yields enhanced performance, smaller physical size. drastically reduced power consumption (portable battery
operation is now practicad, dependability, easy assembly and revolutionary lower pricing!
0.5" red LED 6 digits display
Resolution: 1 Hz et 1 sec. 10 Hz at 1/10 sec.
.$
Sensitivity: 10 My RMS to 30 Hz
Internal power supply: 5.2V at 1 amp regulated
Input connector: BNC type
Includes all parts,
Input power required: 117V AC 50/60 Hz
PC Board and Transformer

Model 250 -30A

as

SOUND ACTIVATED SWITCH

$2q.50eo.
301110 FREQUENCY COUNTER KIT
Take advantage of this new
-of -the -art counter featuring the many benefits
custom

Only

Recording

Bone swats Tee

case.

Ideal kit for beginner or gift for children

Nod twcLuDED

ES

-60

DIGITAL CASSETTE TAPE

ELECTRONIC TOUCH ORGAN KIT

6% s las tax
add 10% postage for out of state Overseas countries add 15% of total order for postage
SEND CHECK OH r%AONE Y 0ROF R TO

1/78

FORMULA INTERNATIONAL INC.

Ju

12603 CRENSHAW BOULEVARD

HAWTHORNE. CALIFORNIA 90200
For more m lormanon please call (2131 679 5162
STORE HOURS 10 -7 Monday Saturday
nai,

CIRCLE 38 ON FREE INFORMATION CARD

www.americanradiohistory.com

IYIEAMuncsR9

projection
television
lenses

GTS -10 two -volume

owner's manual.

FREE!

Get all the tacts on the new GTS -10 General Television
Servicer - the concept that is changing the course
of TV servicing!

Advanced yet sensibly priced at $349 00 the GTS -10

is the ultimate instrument on the TV service equipment market.
In addition to free two- volume set of GTS -10 owner's
manuals you will receive a comprehensive 6 page
full color brochure - describing its profit making
potential and its many unique patterns as well as
information on our 30 day shop trial of GTS -10
General Television Servicer

Convert color TV to
GIANT SCREEN with
Model P -1.85 Plastic Lens
Focal length 12- f1,85
each
$
Diameter 6.5" Length 6.5"
Complete with mounting ring and instructions

140

Model

G -2.5

$165

Glass Lens

each

Focal length 12" f2.5

Diameter 5" Length 43/e"
Complete with mounting
ring and instructions
ALSO AVAILABLE

Limited time
FREE manuals

I
I

/A

Write or call Bill Spellman

Name

MIAMI FLOCK EQUIPMENT CO., INC.

ICompany

Send $1.00 if First Class

delivery is desired.

AMERICAN TECHNOLOGY CORP.

225 Main Street
Canon City, CO 81212

Phone

IAddress

Optical Division
304 N. E. 79th Street, Miami, Florida 33138

Telephone orders of STS -10

General Television Servicer on
VISA and MASTER C-lARGE
accepted for same da shipment .(303)275 -8991.

SEND -11offer

Newly developed Fresnel 2 element

lens in molded hood; designed for
easy mounting. Also available in
separate elements.
Newly developed High Efficiency Projection Screens in
sizes 30" x 40" and 40" x 51".
Projection kit complete with TV set. ALL AT LOW, LOW PRICES.

(305) 759-3124

City

State

Zip

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41 2".61
t30AHD
1

7 WATT LD -65 LASER DIODE IR $895

2N 3820

EXPANDABLE F8 CPU BOARD KIT

$99.00
1

.nlerface, documentation,

5152.60

s 60 ea.

32. 2102-1 fully buffered. 16 address lines, on

hoard decoding for any 4 of 64 pages, standard
44 pin buss.

fea ohmng Fanbug PSU

2N3585 NPN S1 TO 66 ,
S
95
2N3772 NPN Si TO 3
$ 1.00
2N1546 PNP GE TO-3
$
.75
2N4908 PEP S. TO 3
5
00
206056 EEO S TO 3 Oarunelnn S
70
2E5086 PEP S. TO.92
4 $ 1.00
2E4898 PEP TO.66
2N404 PEP I,E TO 5
5.S 1.00
2N3919 NPN Si T(1 3 RI
S 1.50

.1111

Or,

static ram, RS 232

64 BYTE register

r E

.'N5457N EH'
2E2646

4,-

4,

ER 9110TRIE-tGER DIODE
2N 6028 PROD UJT

45

EL

n1P",A 13 NPN S. TO 92

252222
2N3055
253904
253906
255296
206103
.'53638

1
1

$25.00

on paper tape

C /MOs (DIODE CLAMPED)

74C10- .22 4012 .22 4023 .22 404674C193
14C193.1504013 .40
4001- .22 4015-- .95
4002- .22 4016- .40
4006-1.20 4017 1.05
4007- .22 4018-1.00
4009 .42
4019- .25
4010 .42 4020 1.05
4011- .22 4022 .95

4024-

75
22

4025

404940504055406640714076-

4027- .40
4028- .88
4029 110
4030- .22
4035- 1.10

CCO202100

2 25

.40
.40
1.50
.80
1

.27
05

ONDOC7OF
SPECTRA
LA T CABLE
10'/S

In'I

PIN

16

50
r

18 PIN

10

5 195
$ 6.75

18

PRV
100

3.50
$ 1.95

200
400

07
09

475

G00

IT

75
6 9'y

800
1000

15

MM5203 UV PROM
17076 UV PROM

2.50

4.95
510 95
1.95
S
$ 6.95
S

52044K PROM
82523
AY6 1013 UART

4148
Fi

lA

9lil.:

II"I15iT

LED READOUTS
FND 359 C.0 4" $ 50 DL704-.3"
FND 70 GC .4S .55 MANt7-.3"

20

FND 503 C.C. 5" $

END 510C.A. .5" C

Tanns: FOB Cambridge, Maas.

Send Cheek or Money OnSer.
Include Postage, Minimum
Order 55.00, COD'S $20.00

309K
723
LM 376
.

15 51 00
50

320K5
320T5.

C.A.
85 NS 33-3 dig. array
.85
7 7
A .6'"

6151.00
$

75

100 /$1 -00

aa

3A

124

14

20
25
30
35
45

30
35
50
70

90
110

2.30

10.50

2 75

.95

$ .95
5 75

Of

ut 15V
15

74267427
7430
7432
7437
7438
7440
14417447-

650
850
1250

24V

RS232
CONNECTORS

Send 25d for our catalog featuring

Transistors and Rectifiers
145 Hampshire Si., Cambridge, Mass.

DB 25P male
DB 25S female.

1.00
S
50
S
55
5'5 00
3'0 00
1

30

.52

'.65

74151- .65
74153- .65
'4154 1.00

.70
.65
.70
.15
.32
.32
.32
.45

7472

74737474
7475
7476

14155
,70
74157
.65
74161
.85.
74163
.80
74164
95
74165 1.05
74173- 1.35
74174 .95
14175
.90
74176
.75
74177- .75
74180
,65
74181 - 2. 00

.30
7480.45
7483- .70
7485
.87
7486
.30
7489
1.85
7490
.45
7491
.65
7492- .43

74190 - 1.20
74191- 1.20
74192
.83
74193- .83
74194- .85
74195
.85

74937494
7495
7496
74107

.45
.70
.65
.65
.28

74121

.33

14279

74123
74125
74126
74150-

.65
.40
.40

11,491

7425/
75492

.86
.87
.50
.50

-1.10

CHIP....

$5.75

MINIATURE DIP SWITCHES

$1.15

.50
.60

I.00

5 S

M7001 ALARM CLOCK

78 MG
79 MG

5
$

7425

4.25

El 40

95

74487450-

7412
7413
7414
7416
7417

3 /11

340K 5,12,15
or 24V
5 85
340T-5, 6, 8, 12
15,18 or 24V$1.10

.16
.20
.20
.25
.25
.20
.20
.16
.20
.20
.39
.85
.25
.25
.16
.25
.25
.25
.16
.25
.24
.24
.16

7420125A

7446
7447

7411

$ .25

50 /s
80
15
40
80
1

7445-

.16
.16

7410

59.95

.16

7401-

7409-

2%" diameter
AV at 500 ma. $4.00
REGULATORS

1,10

C C.

..

..

SILICON SOLAR CELLS

LlORT ACTIVATED SCR',

TO 10 200V

.90
r,li

Silicon Power Rectifiers

...

or22V

1.19

1101A256 BIT RAM

I, R EEN
5

7400
7402
7403
7404
7405
7406
7407
7408

1000/$8.00
WATT ZENERS 3.9, 4.7, 5.6, 8.2,
12,18,22,100,150 or 200V
ea. $ .60
WATT ZENER5 4.7, 5.6,10, 12, 15

TA
06

5204K DYNAMO PAM

Y E LLOW

5691

$400

MC6860 MODEM CHIP

$1575
rot e

21 single 14 pin IC's

LSI DIP IC's tool, busses for

$1 35
S1 35

52.95

5aso

MGM 6571A 7. 9 upper B lower

case character

CTS-206 8 Eight
p t5PST switenes
a 16 pin dip package
,

AV SPST

te

r,et

.E10 75

a11y

SOLID STATE SALES

P.O. BOX 74D

SOMERVILLE, MASS. 02143 TEL. (617) 547.4005

www.americanradiohistory.com

/5
.95
1.20

25A
1.30
2.00
3.00
4.00

1.25
1.50
1.75

SANKEN AUDIO POWER AMPS

Sr

Sr
Sr

..

1010G 10 WATTS.
1020
1050

G
G

7.95

..

20 WATTS
50 WATTS

615.95
527.95

TANTULUM CAPACITORS
5V 5-51 00

470E 35V 5 Si 00
681.1E 35V 5 S1 00
IDE 35V
5S100

10UF
22UF
15UF
30UF

10V
25V
35V
6V

7311E

15V

20 V 5 51 00

2 2 UF

.25

5 40
3,51.00

5151.00
40

47UF 20V
$ .35
3 3UF 35V 4S100
4.7UF 15V 5/51.00
$ .50
68 UF 15V
6 8U 35V 4151 00
7415 SERIES
4.5125
sz LINEAR CIRCUITS
4.5126
74L500
65 1M 10'
)5
26
502
41503
41_504

26
26
29
28
28
28
26
26
50
28

41505
50 608
41_509

741,10
4.5111

41513
741515
141520

741.5132

80

4L5136

39

41.5138
5139

72
72

41_5151

98
93

LM
LM
LM
LM
LM

74L5153
74L5155
7415156

20o
95

7L5157

98

26

5160
74L5161

41_521

26

741_5162

522
41_526

26
33

02
02
02
02

74E6168

41_530

33
26

7.527
741532

741_537
741_538

4.540
41842

33
37
37
27

41_5190

88

4.5191

74L5192

26

554

26

4.590
4.573
4.574
4.576

95

41590
41592
41593

89
85
85

40
40

7aL5193
1_5195

7415196
4L5197
415221

3
-

741_5112
741_5113

43
43
43

14

100
200
400
600

75

381

-1 25
25

t 01

39

EM 551.

05
22
50
50

LM556

3EL.

55,

75

00
95
125

130
90
25
35

703
709
>10
741 C cr V

7415365
415366
7415367
74L5368
7415390

66
66

1458

1.10
1.60
2.30

44
85
2

456

70

-2.50

540.

75

10A

50

560
565
566
567

741,279

66
66
195

95
1

537

40

-115

-2.50

72

125

OS

-110

37
380

10
10

25
99
99

-1

3711

747

.70

1.70

75

1.20
95

38

40
10

00

310
315
325
335
350

35

7415258

TRIACS
IA

PRV

rs. 30. 748

29
30
LA030,

LM
LM
TM
LM
LM

75
75

741_5257

]4`5109

AILS,

4.5163

4/.5169
74L5170
OL5173
415174
7IL5175

41_551

$2.20

75,35200

LCO MINIATURE TOC;(;LE SWITCHES

SI 20
MTA IO6SPDT
MTA 206 DPDT
51 70

CIRCLE 48 ON FREE INFORMATION CARD

2A

200
400
600

In

lay

rr-33017hn,ou resisrance

PRV
100

.60

515

TTL IC SERIES

hold up In

Foote supply. on Pe Ctor

'IV

25651

NPN 5, T() 18
NPN S1 TO 3
OPE S, TO-92
PEP S, TO 92
NPN S, TO 220
PEP S. TU 220
PEP S. TO 5
NPN TO 92 S1

4''.6

.u.11

16, o,

8,

...

,,5c5

VERIPAX PC BOARD
lb -single sr led paper epnxV
DRILLED and ETCHED

,.111f is .11

LARGE LED's
1L -5 IMCT21
MOLEX PINS

111

50.,,11.

2E13 LIIARAC TER ,EN

2518 RE I 32 BIT SR
21021 1024 BT RAM

MK4008P

h,.

P dill PHOTO TRANS

RED, YELLOW, GREEN or AMBER

030 WIRE
-.2224 PIN -.40 WRAP WIR:
- 25 28 PIN .50 SINGLE
STRAND
-.2840 PIN -.60 100'
/S 40
30

2/08815 EPROM
..722 STATIC 51111

21008..

DIP SOCKETS

8 PIN
14 PIN

$145.00

BIPOLAR LED

WSU,30 Hand wire wrap tool used

to wrap, unwrap & strip k 30 wire S5.30
4

100 charge coupled device

Image sensor

.78

4042

1.00
.70
S
5'S 1.00
3 S

2N3767NPN5.TO66

N1INIATURE MULTI TUR1I, TRIM PITS

100. 500.
K,2K,5K,10K,25K,50K.100K,
200K 500K Meg. $.75 each
332.00

4K BASIC FOR FAIRBUG F8

Full Wave Bridges

TRANSISTOR SPECIALS

PRINTED CIRCUIT BOARD

UNIVERSAL 4K x 8 MEMORY
BOARD KIT
$74.50

31

65

13'0

Cn3046
3900
803BCC

U07919.5

50
95
50
75

49
90
3
195

SCR'S
25A
1.30
1.75
2 60
3,60

WE SHIP OVER 95%

OF OUR ORDERS THE
DAY WE RECEIVE THEM

1.5A

6A 35A

.40
60
1.00

.50 1.20
70 1.60
1.2C 2.20

1.50 1.00

POLY PAK'S IS THE "BARREL KIT KING" OF THE WORLD!

'i EXCLUSIVE

ARREL KIT 2253

LINE CORDS

for

S1.98
l00's

of AC power
Heavy-duty. 6 -ft. tong, v1
gage. White vinyl i sol
Wt.
Don &
1 plug.

YOUR
CHOICE

ANY

40 -ft.

$1.9

BARREL KIT 205

MINI BLOCK
CAPACITORS

.Stopwatch
ICM7205
AY3- 8500.1 Six TV Gooses
MM6330
41/2 Digit DVM
Volt Control Om
O
8038C

682376

0 96H9O0C
0 MC14410

50 for $1.98

Unbelievable! Worth 850.

eubmini
precision
High
for all applicetlona.
Ps
t.

nzs.

No.

SOSOS

17026

02708
0 2102 -1

detects, hidumps into

barrel! Excellent oats of
100 9 metal film
i1
430x. Long leste
R3411
p

fi, sec.

4.95
6.95
8.88
9.95
3.95

.
.

15 for

15 for $ .98

for $1.98

15

100'; material, user

s
canfactory
from
cellation

dumps, 3V 10 mile, For

100's of projects, red len..

1R3389

al. No-

r'-

/leads

BARREL KIT #162

JUMBO RED LEDS

1.39
14.95
9.95
14.95
1.95
1.95
5.95

Barrels of untested 17 ",

-3 ", .5 ", 7 -sags. Like END 357, 500, 503, MAN -3'a.
1R3619
Wut a buy! No.

tail,
183621

Solder

SwINDICATORS

t!

BARREL KIT :149

BARREL KIT :158
BARREL KIT #160 ' - ,,BARREL NIT `159
ROCKER SWITCHEFMODULAR SWITCHES MAGNIFIED MAN -Ste
HOBBY VOLTAGE
20 for $1.88
-, :{,-)T1{F+7H4747
REGULATORS
25 for
or $1.98 `
gFumons MAN -.n se
10 for 51.98
$lags "push -O\"' ent re dour, built von map TO -3
barreled.
1.51 -'309K
many,
witches,
Tpd1.
Factory
discontinued
who
s
exmers.
but
Barrels
t by the pound,
get
et Brand line, Untested, guaranteed
customers
heck 'e 7 Your cess. Updt, Spdt, etcants to
n'; .0.l4.
IR3325
deal. No.
183302
Cal. No.
.on.
Cat. No1R3330 new.
1113150

Air

BARREL KIT 200

6 DIGIT
READOUT
MODULES

30 for $1.98Habhr

I.Watt, tiny, 100% mate1113368

Cat. No.

B1U

11,_'
know
,,

SN7473

14
19

1047423

0 667427

trol

maker unloads.

con.
Asst.

value., what a buy. Worth

1113057
St
.

BARREL KIT :6
HOBBY LEDS

40 for $1.98

PHOTO ELECTRIC
CELLS 10 for

RESISTOR SPECIAI

200 for
$1.98
Includes:
hers,

t/.'
ts
carbon,

100% good,

$1.98

1.

L-

ARREL KIT #53

LM -3407
REGULATORS
15 for $1.98

tor
$1.98

Ojoob

BARREL KIT #61

POLYSTYRENE CAPS

100 for
:000'x. $1198

567432
547437
667438
5117540

BARREL KIT #93

SN741

HALF WATTERS

200 for
$1.98
Resistor

rid

us

ox.

SN7446

watt. Asst values.

ed,
Carne tu u in n barrel.
Cat. No. x 1112746

brel.

BARREL KIT 158

SLIDE SWITCHES

25 for

$1.98

B ARREL

KIT #35
NEON LAMPS

mts

maser.
popular
Never grows old. But
he way the RElei
Tt, t,,r tS bur 'em from the
fart or iris.
1112614
Y':i

BARREL KIT #24

PLASTIC
TRANSISTORS
100 for $1.98

BARGAINS
BEST
IN ELECTRONICS
Poly Paks Ina" Wakefield, Mass., U.S.M. L977

and

100 for

s helm,
never
Imagine famous switching
ices'
d
der
these
I nteste. No.
152418

77

.63

B ARREL KIT :87

NATIONAL IC

Factory people are sometimes '54uaree" when they

topple prime guare ohms
mix 'em p to barrels, Asst.
values watts.
1R3056

10 51474176 1.49
5874180 .69
.69
.86 05674181 1.99
A19
.69 0 5874162
-2910 51174190 1.15
-19,0
.99

0 11/174192
4193
fo
.39'0 5874184
.39'0 5674198
.31

1E

BON ANZtAI

.85
.75

0 for

5674197 .76
4/174199 1.89
5674200 6,60

mixed

1.19

66174241

BARREL NIT :6a

2 WATTERS

100 for

$1.98

100% good.
be krortmo
into
barrels ofnt
poly's.
m, ;deds,
plastics.
i,ram r.. d' rs,
!112731

don't
cofanny hrow ers
.n the
ont, nt' meow
All eel. It's a i'1 gold
All narked.
IR27

BARREL KIT #40a

HOBBY PNP
15 for
POWER
TRANSISTORS $1.98
d iliPopular germanium

BARREL KIT #38

BARREL KIT :30_71.aq4

PREFORMED
R SISTOR6

BARREL KIT :27

PREFORMED DISCS

Emptied

a 6 DIGIT
READOUTS
10 for $1.98

HOBBY NPN

,:nlage.

182813

100 for $1.98

!lobby and untested, marked

d internal numbers, from
to 47 nine Wut a buy!

Wt. 16 ors, No.

1R2424

PS

hobby
Untested 461.93
llar include 701's. :41's,
556 in7
s
707.
el
'oked and
1R2416
,eke.. Cat. No,
:

Cat. Nn.

1R2609

a.

TRANSISTORS
15 for $1.98

Factory fallouts and "off

spec" TO -3 powers, 100%
obby, no opens. no borts.
No.
1R2617
Wt.
lb.
1

150 for $1.98

Ili -Fi mfr's shelf

but

na nrke. ome with internall numbers. Wt. 18 0

152431
Cat. No.

KIT :7
VOLUME CONTROL
BONANZA!

30 for

$1.98duals,

Single,.

values. styles. big one

1R2421 s
small ne..

BARREL KIT #1
587400 DIP IC'
75 for $1.98
Marked

f anif 16 pin

.1

ty. Wt-

14

CIRCLE 29 ON FREE INFORMATION CARD

www.americanradiohistory.com

.r

40 for $1.98

1,e'j

1112426

nIN

itijiure
tinnn series.
SO

of

bray.

the
in.

6n, 2nn,

40n, a00. F0D and 147

11124117
volters. Lat. No.

'farms: Add postage Rated: net 30

Phone: Wakefield, Mass. (617) 245-3829
Retail: 16 -18 Del Carm'ne St., Wakefield
MINIMUM

.dIR2415
t

31

hRAI(
POLY
J

'o

Marked

S1.98--d
100 for the

All the famous p!nsti1 power tab type. Bitw factory

All the 10 amp types.
Cat. No.
1R24191'Meste'I

of

watts.

BARREL KIT :4
4000" RECTIFIERS

BARREL KIT #5
SCRS, TRIACS,
QUADRACS

Ql

variety

152697

veotori

for Pl'

200 for
$1.98

Untested and hubby, from

u. Marked and
factory to

capacitors ma e
shiny finish. Imagine factory dumping 'em n barrels.

m in bar
dumped 'em

PRECISION RESISTOR

IKEA DIPS
100 for $1.98

$1.98

Cat. No.

1112606

SAND

Fine.

he

1526ns
MPreformed.
ixed values toi.
BARREL KIT :14

BARREL KIT #17

60 for

1R2603

BARREL KIT #10

ROMS- REGISTERS
75 for

2H

:ul ue

BARREL KIT #1
DIPPED MYLARS

POWER

Bargain of a lifetime. We
TO -:t'n, factory offgot
barrel of 'em, but no
tu test, Untested' and spec" und falluts, 100%
n
no shorts!
hobby. Multiplexed, bitsdor hobby. n
1112618
type, tit. k "riss
182722 Wt. laozs. No.

BARREL KIT :31

METALLIC
RESISTORS

182860

untested. factor,
le. Linears,

in b

7400'x, ROMS DTL'S, registers. rlomk and calculator

chip, anti more Wt. 12 ors.

BARREL KIT :25

METAL CAN
TRANSISTORS

3407-

$198

0 SN74177

KIT /107

SQUARE OHMS

'eadm,

BARREL IT
LINEAR OKP AM#2
194148/914 11iena
SWITCHING DIODES - DIPS 75 for
1

B ARREL

60 for $1.9

t,

$1.98

BARREL KIT

5874161 1.15
1.19
.93
5674176 -68

0 5N74174

'i

fi

NPN, plastic TO220 type.

Assorted 2N numbers.
182425 Untested.
No.

0 61174173

2F0 for $1.98

100
for $1.98
for $1,98
sed
Na gil terr,.l, of
Made mostly by
till prime. the finest re,lotor Corning.
melra for pc
mad`.
eve
me YourIlltone
matters. 1%
Mostly
set
adwooers.
uuer..
bsrrel'ed
400: 4., loot
loo:
bure) of
tot.
5

40 for
$1.98

all of us u favor. WUT A

BUY! Ass.. capacities and
voltages. No.
183227

.96

$1.98

Famous NE -2's.
but factory

hobby transis- Factory unloads barrels of

hobby and untested
tors, TO-!12 ITO-181, asst.
26 numbers, seer. monu(oc- TO -5. TO -1, and TO -18
ze
transistors. Marked and un.V,.
marked. Wt. 20 ozs.
R2604
Cat. No.

BARREL KIT .1I

POWER TAB
TRANSISTORS

.87

100 ins.

ishto

100 for

Truthfully the factories my

in barrels, do
mixing 'e

.89

.87

-68
.63
.45
.45
.68

183294

BARREL KIT #127

AXIAL ELECTROE

BARREL KIT #71

CAPACITOR SPECIAL

50 for $1.98

POWERS! POWERS!

LR2726

$1.98

567495
567496

why the facI

'h g."
s'e
in barrels.
Factory saran aid 100- m,v'. Wcetories
dont
n'
separate
Never- tra -see -est i'in offer.
17
12,
15V. under wide as voltages i values
sfai... Double phi/
1112747.
1R2741 to .100 :ul.
BARREL KIT 15
BARREL KIT :58

type, color codPt upright

Irs

lae

0 8147495
0 6674107
0 5674112

SN7493
5147494

ELECTROS

$1.98

$1.98

.24
.24
24
-14

567452

TRANSISTOR

100 for

3X74180
8/174184

Only

and audio.
t. 2 Ihs.

.8
40 for $1.98
-84

0 SN7416a

.14
51174132 .83
.14 Q S1174140 1.00
.92
14
.I4
.89

5674115

in
,agi
ag

181961

-89
.29

li(I

transformer
r nsformer ha,
Asst, intputs, inter

M::11

51174161

115

'

TRANSFORMER
15 for S1.98

S N7

2,95

.14
.26
.26

BARRE

BARREL KIT :76

1 -WATT ZENER5

200 for$1.98umentea.

FEATURING THE WORLD'S

BARREL KIT #36

GERMANIUM DIODES

POLY PAKS CATALOG

567451
DI 587453
567454

factory tried to
by mixing loo,

All types. 7400'x.

made. As a gam- All shapes. sizes. spot, Jtid I. Large di- trihutor
sisal
"nacre, RAMS, ROMS. RTL, ble
bought 10 barrels
u,rrels of a1 power
etc. Tremen- house.
UTI., li nears of all kinds. from w'factory. mixed values: dous
for 100'0 of
t.
What e mix. Hobby and un- all good.
switching
1112729
projects
Cat.
No.
1112724
IR2730
tested. Wt. 12 or

Send for your FREE

0 567450

1113046

567486

49 0 5674123
.89 0 6674126
.14 0 6N74128

587442

t/

MINI

.8a

9147465

.1

5817430

color-coded resistors
separate.
us
la there
good. t Cat. No.
1113052 barrel. But value

200 for
.

UUU

Mixed by factory. Big

BARREL KIT #91

SUBMINI RESISTORS

WOW! Top U.S.A. maker J'ame'y rejects. hobby,

damps dinrretes in bertele. metic rejects Mav nclude
24
(lobby and untested. Use- 5. f. 12. 15. 10 t
r tab.
able yield 50'0 or better' vo lts, TO -220 0
1R2855
Itt. f11
Wt. 4 or.s. No.
wer
182635

BARREL KIT :62

MIXED IC'S

Asst. GE types, CDS types.

for

1R3054

.737y

.61 Ll 557490
.24 0 5147491

O 5117420

ne

.48

.39 45N7486

667414
567417

meg
100 to
approx) because faelt.rY
discontinued line A barreled
What a buy. Single
tun.
W... ,.r.
183346
l

4438 1.2 6
.91
3X71161 -98
-7S
-11 D 6X74188

N74]0

Esta

Cat- No

.14
.61
.28

e'

'

Asst. value

OFF

a T7N 60

the lowest prices..

LZ 8N7470

/Irk

30nfor $1.98
pots,

B 15% OFF

erg, be

we have

We

25p

!II
W

"

MINI TRIM POTS

BARREL KIT

f'V' V

jQ

dumps
1000's of PC board' loaned
with Co.
'
r esistors, diodes,
transistors, 100 % good.
Wt. 2 Ih.s.
No11133388

ITT version id '15491 and

2's, fur driving multiple
LEDs. Clocks, calcutatora,
etc. 14 -pin dips, untested,
excellent yield.
1113360

roll, from 2V to 30V. Axial

leads, No shorts, no opens.
DO -7 A micro epoxy unite.

005

BARREL KIT #183

BARREL KIT :17LED DRIVER ICS

SN7411
SN7413

BARREL KIT :101

BARREL KIT
PC BOARDS
400 PARTS

f1.98 maker
Cum31.9

100 for $1.98

0 5117440

CONTROLS
15 for 51.98
Used in hili. volume

Use

LLCii

BARREL KIT :161

MICRO ZENERS

Type

BARREL KIT #104

SLIDE VOLUME

hlue -green

for 51.98

6X7400 $0.11
I4 D 3X7473
S 3X7401
587474
0 5X7476
,17
0 6X7404
SN7476
687406
-19
.19 n N7'463
0 997406

BARREL KIT #99

x 1" panels that glow

with 110VAC.
for nice tiles. indica1113550
tors. etc.Cat. No.

4"

manufacturer Barrels
d barrel. and no
Test lamp
Worth
e to test. Calculator and
dumps inventory!
69e ea. Like grain-o- wheat. driver chips beneath epoxy
1R3616
on bark. Wt. 6 on

on

BARREL KIT #210

GLOWIN' PANELS.
3 for $1.980 !/,"i'j

Hobby

$1.98

$1.98

for $1.98

cex,

BARREL KIT :219

MIXED READOUTS

8 for

It's
20 -key, 4 fune
keyboards at rldipu
lotto give -away. Wt. 12 oat;
Cal- No1R3524

22.88

12931x.

:h

BARREL KIT :201

Lion

1702A
ROMS
for

t2z

BARREL KIT :201

CALCULATOR
KEYBOARDS

10

EL KIT

HOBBY

of the fa
stereos. For '0 x 15/16""
moue
sable program
mounting hole. with
nable ROM. 2040 bit.
wors.
e leads! Wt.
Cat. No
1113729
183766
Cat. No.

gtOraUfi't

four 10 -pin.
lo- profile. No.

KIT #246

for $1.98 pplia

12
(:real. for Al:

rnonev back

Mfr unloads! Four 14-put,

29.95

1R4022

rms.

UTILITY AC
OUTLET

tdrrirs

mike amplifier, trigger.

SCR. Use for alarms, etc!
1113625
Wt. f. ozs.

12.50
2.95
14.95
4.95

Alarm Clock
Micropr
Erasable PROM

8K EPROM
1K RAM
650 MHa Prescaler ..
KR2376.ST9 BCD Encoder ROM
KR2376.5T ASCII Encoder ROM
D 3.879M9
60Hz Time Base
Time Base Xtal
1.00M13
Touch Tone Xtal ....
1.00MHz

for$1.98n

Popular, 100.

.95

350 MHz Preecalar

Touch Tone Encoder

MK2002P
Char, Gen. (2513 equal l
72076/7208 Frequency Counter, pair
31/2 Digit DPM
ICM7107

MM5316

IR3528

BARREL KIT #18

, -WATT METAL FILM

150

for
j ry
$1.98
'Handd cla p.' tensi,,fes co
3

$14.95
9.95

ROM BCD

En

I:ren'

BARREL
SOCKETS
I -.IC

SOUND TRIGGERS

B ARREL

KIT #221

BARREL KIT :225

1114046 and Type No.

Sala

Order Cat. No.

Type

43

WI

RE- TESTERS DO!

POLY PAKS CHIPS AWAY

oak IC & XTAL PRICES

For mikes, stereos; 1 -cond.

plus shield, 22 ga, vinyl
Ib.
jacket. Wt.
1R3577
Cat. No.

0,6 full
an d
25
bridges. Row giant. we Jun,

know, Untested and hobhi.

100' S OF BARRELS PU CHASED!

For the first time anywhe e, Poly Pak throughout the United States buy
merchandisers introduce a new way from various factories ... their overin buying the economic ! way. Raw runs in barrels. Poly Pak has done
stock from the "barrel" Remember the same. Therefore you are getting
ey're back the same type of material as the
the "good ole days "?
again. The same way m rchandisers

hot 2 tons of 2. 4. 10

We

KIT

ARREL KIT :239

SHIELDED CABLE

BARREL KIT 270

B RIDGES! BRIDGES!
20 foe$1.98 111$_.

OF

ORDER-$8.00

PA

P.O. BOX 942R LYNNFIELD, MA.01940i

ADVERTISING INDEX
GREAT
IDEAS FROM
WEST SIDE ELECTRONICS

RADIO -ELECTRONICS does not assume

any responsibility for errors that may
appear in the index below.

Free Information Number

19

MT1

12/24 HR.
50/60 Hz

ra

AC /BATTERY

n.
LI

24 HR. ALARM

79

cs
t

31

Ir ;

..

is

67

continuously

real time applications.

MT1-C kit,less case

$109.00

PINK NOISE
GENERATOR KIT

PNG C

Inexpensive unit allows

proper set -up of graphic
equalizer in a stereo system.
Easy to use

Partial Kit, less

case and switch

Only

$9.95

Complete Kit $13.95

PNGW - Assembled & Tested $19.95
WEST SIDE ELECTRONICS
P.O. Box 636, Chatsworth, CA 91311
PNG -K

pay all shipping in Continental U.S.A.

Others add 10 %, California residents add 6% tax.
We

CIRCLE 6 ON FREE INFORMATION CARD

60
74

64
14

72
25

36
51

100
70

24
17

56
22
5

47
61

34

NEW PRODUCT
THE

$2900

39
9
13

DPM

ANY QUANTITY
83
1,2

78

SI

4016

SERIES 1100

E.

Tennessee St.

Tucson, Ariz. 85714

(602) 748 -7900

TWX 910 -952 -1170

Fully Bipolar- Autozero

Big .5 ", 3 1/2 Digit Led Display
1000 MEG Input Impedance
2V F.S.
750 mW@ 5Vdc Power

115/230 VAC Power Optional

Single I.C. Construction
$29 Any Quantity Plus $3.50 for
Handling and Shipping
Optional Power Supply with
Connector $20. ea.

62
76

NAME

59

CO

ADD.
CITY & ZIP

ENC,

C.O.D.

Communications Electronics
Contemporary Marketing
Continental Specialties
CREI -Div. of McGraw -Hill
Continuing Education
Davis Electronics
Eastern Industrial
EICO
Electronics Book Club
EMC Electronic Measurements
E & L Instruments
Fidelity Sound
Fluke
Forest Belt's Training Workshop
Grantham College of Engineering
GTE Sylvania- Consumer Renewal
Heath
Hickok Electrical Instruments
Huntron Sales
Indiana Home Study
International Crystal
James Electronics
Jensen Tools & Alloys
Leader
Logimetrics
McKay Dymek

P.O.No..55

Page
81

31,75,81
62 -65
78
16

Cov. IV
30
52 -55
84
25

Cov.

84
85

71,72
15

82

80
83
77
7

75
2
13

73

67
82
17

67

Devtronix Organ Products

Digi -Key
Discount Music Club
71
DRC Electronics
73
Electronic Lollypop
15
Electronic Warehouse
42
Etco Electronics
63
Fordham Radio Supply
38
Formula International
Fowler Alarms
85
Fuji-Sues
37
Godbout Electronics
45
Hobbi House
Information Unlimited
75
Integrated Circuits Unitd.
Interfab
66
International Electronics
23
International Microtronics
20,21 James Electronics
Lakeside Industries
Lab Science
54
Meshna
32
Miami Flock Equipment
41
Morrow's Micro Stuff
40
New -Tone
80
Olson
49
Optoelectronics
16
Page Digital Electronics
77
Parasitic Engineering
29
Poly Paks

92
105

112
106
107

86

100,101
89
93
89

112
92
103

104
111

112
114

96
108,109
89

104
112

94
102
88
104

99

86
110
95

Quest
Radio Hut
Radio Shack
Ramsey Electronics
S.D. Sales
J.B. Saunders
Solid State Sales
Surplus Center
Tasco

28
68
44

69
18

48

79
83
76
76

Page

58

72

MTI
Mountain West Alarm Supply
National Camera Supply
National Radio Institute
(NRI) -Div. of McGraw-Hill
Continuing Education Center
National Technical Schools
Netronics R & D Ltd
OK Machine & Tool
PAIA
Philips Test & Measuring
Division

III

26,29

82,84 Professional Aids

27
PTS Electronics
35
Rye Industries
30
Schober Organ
26
Sencore
33
SGL Waber Electric
7
Southwest Technical Products
Spyderco
43
Techni -Tools
53
Telematic -Div. of UXL
12
Tuner Service
VIZ Mfg.
52
46
Wersi Electronics

65

CHECK

Aldelco
Advance Electronics
Advance Schools
American Audioport
AP Products
Avanti Research & Development
Channellock

CIE-Cleveland Institute
of Electronics

the Ultimate Digital Timepiece. 17 digits

read out the month, date, time, alarm
setting, and timer. The MT1 operates on 110 VAC,
with battery backup in case of power failure; or off
12 VDC for operation in a car or boat.
The timer on the MT1 can be used in one of three
modes to control an external device.
The MT1 is designed for custom installation. Several
partial or full displays can be run from one master
clock unit. Easily interfaced to a computer for
The MT1

57
8

XTAL TIMEBASE
10 MIN. SNOOZE

Free Information Number

104

90
87
92
91

113

94
104
92

Trumbull

104

West Side Electronics

96

80
79

8 -11

32

MOVING?

71

20,73
77

Cov.

Market Center
Active Electronics
ADVA Electronics
American Technology
Babylon Electronics
Karel Barta
Burdex Security
Chaney Electronics
CFR Associates
Cornell Electronics
Command Productions
Dage Scientific Instruments
Delta Electronics

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67

tronics.

II
72

84

Give

US:

ATTACH
LABEL

18

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74

tice

HERE

19

74
67
85
5

Your old address and zip

code

74

102

Your new address and zip

code

106

94
110

name

(please print)

86
112
102

address

89
89
89

city

state

zip code

86

Mall to: Radio-Electronics

SUBSCRIPTION DEPT., P.O. BOX 2520,

110

BOULDER, COLO. 80322

CE

NEW LSI TECHNOLOGY

FREQUENCY COUNTER

TAKE ADVANTAGE OF THIS NEW STATE -OF- THE -ART COUNTER FEATURING THE
MANY BENEFITS OF CUSTOM LSI CIRCUITRY. THIS NEW TECHNOLOGY APPROACH
TO INSTRUMENTATION YIELDS ENHANCED PERFORMANCE, SMALLER PHYSICAL
SIZE, DRASTICALLY REDUCED POWER CONSUMPTION [PORTABLE BATTERY
OPERATION IS NOW PRACTICAL], DEPENDABILITY, EASY ASSEMBLY AND
REVOLUTIONARY LOWER PRICING!
$1199COMPLETE!
60 MHZ COUNTER WITH CABINET & P.S
KIT #FC -50C
650 MHZ PRESCALER NOT SHOWN]
29.95
KIT #PSL -650

MODEL #FC -50WT

MODEL #FC- 50/600WT..

60 MHZ

600 MHZ

COUNTER WIRED, T
COUNTER WIRED, TES,

CAL.

165.95

00

199.95

SIZE:
3" High
6" Wide

PC-110

51/2" Deep

FEATURES AND SPECIFICATIONS:

DISPLAY: 8 RED LED DIGITS .4" CHARACTER HEIGHT
GATE TIMES: 1 SECOND AND 1/10 SECOND
PRESCALER WILL FIT INSIDE COUNTER CABINET
RESOLUTION: 1 HZ AT 1 SECOND. 10 HZ AT 1/10 SECOND.
FREQUENCY RANGE: 10 HZ TO 60 MHZ. [65 MHZ TYPICAL].
SENSITIVITY: 10 MV RMS TO 50 MHZ. 20 MV RMS TO 60 MHZ TYP.
INPUT IMPEDANCE: 1 MEGOHM AND 20 PF.
[DIODE PROTECTED INPUT FOR OVER VOLTAGE PROTECTION.]
ACCURACY: + 1 PPM (` .0001', I: AFTER CALIBRATION TYPICAL.
STABILITY: WITHIN PPM PER HOUR AFTER WARM UP 1.001'.. XTAL)
IC PACKAGE COUNT: 8 ALL SOCKETED]
REGULATED.
INTERNAL POWER SUPPLY: 5 V DC
INPUT POWER REQUIRED: 8 -12 VDC OR 115 VAC AT 50/60 HZ.
4
WATTS
POWER CONSUMPTION:

PRISCALE
POWER

OFF

KIT AFC -50C IS COMPLETE WITH PREDRILLED CHASSIS ALL HARDWARE AND STEP -BY -STEP INSTRUCTIONS

WIRED

PLEXIGLAS

ABINET

displays.

3FFH,6Y4FFW,534FFD

CABINET II
234FFH,5 "W,4 "D

Black, White or
Clear Cover
$6.50

ea

6BIg

4- digits

time
set switches
Plug transformer
allparts included

34508

..:.
i

Plexiglas is
Pre -cut & drilled
Kit N850 -4CP

-572Ei

2/45.

$2995

21102-3

LOW POWER - FACTORY FRESH

$1.75 ea.
100 -199 $1.45 ea.
-24
1.60 ea.
200 -999 1.39 ea.
25 -99
1

1000 AND OVER

Krr
i

JUMBO DIGIT CLOCK

-outer

OI22aN53

PRINTED CIRCUIT BOARDS for CT -7001 Kits

sold separately with assembly info. PC Boards are
drilled Fiberglass, solder plated and screened
with component layout.

DISPLA,

T:-1

Specify for 7001

B,

Cor

-67.95

,2124
VARIABLE REGULATED

AUTO BURGLAR
ALARM KIT

p1

AN EASY TO ASSEMBLE AND EASY TO IN STALL

ALARM PROY1015G MANY FEATURES NOT

NORMALLY FOUND KEYLESS ALARM HAS

FOR POS
E
GROUNDING
PROVISION
SWITCHES OR SENSORS WILL PULSE HORN
RELAY AT 1HZ RATE OR DRIVE SIREN BIT
PROVIDES PROGRAMMABLE TIME DELAYS
ALARM PERIOD UNIT
FOR EXIT. EnTRY
REMOTE SWITCH
MOUNTS uNDER DASH
CAN BE MOUNTED WHERE DESIRED CMOS
RELIABILITY RESISTS FALSE ALARM
PROVIDES FOR ULTRA
LOW PRICES, THIS ISA
BE
TOP QUALITY COMPLETE KIT WITH ALL PARTS
INCLUDING DETAILED DRAWINGS AND IN

OR
TESTED

AVAILABLE

WIRED

AND

KIT #ALR -1
iIj

AL

i,11AL

ft

$J
9 J
R -1 WT

ED &

TESTED
$19.95

2/$38.

JUMBO DIGIT
ea.
;,/
CONVERSTION KIT
Convert small digit LED clock to large
.5" displays. Kit includes 6 - LED's,
Multiplex PC Board & Hook up info.
Kit #JD -1CC For Common Cathode
Kit #JD -1CA For Common Anode

$7995

$095

i7

()ISPLAi

Kit #5314 -5

7W1C

KITS ARE COMPLETE (LESS CABINETI

7001 X DISPLAY
7001
ALL 7001 KITS FIT CABINET AND ACCEPT QUARTZ CRYSTAL TIME BASE KIT

ea.

complete Kit (less Cabinet) featuring

six .5" digits. MM5314 IC 12/24 Hr.
time, PC Boards. Transformer, Line
Cord, Switches and all Parts. Ideal Fit
in Cabinet II

1j1L
EI_EE.I11; I111_"b-,_...
KIT 1001

Will. alternate time (8 seconds) and date (2 seconds) or may be wired for time or date display only,
with other functions on demand. Has built -in oscillator for battery back -up. A loud 24 hour alarm
with a repeatable 10 minute snooze alarm, alarm set & timer set indicators. Includes 110
VAC /60Hz power pack with cord and top quality components through

$1.29

FOR THE BUILDER THAT WANTS THE BEST- FEATURING 12OR 24 HOUR TIME
29.30 -31 DAY CALENDAR. ALARM. SNOOZE AND AUX. TIMER CIRCUITS

KIT- 70018 WITH 6- 5" DIGITS

..839.95
KIT 7001C WITH 4 .6 " DIGITS &
2 -.3 " DIGITS FOR SECONDS ..... $42.95
KIT 7001X WITH 6 -.6" DIGITS
..$45.95

HIGH SPEED RAM

IWir & Cal $9.95

1:I
13EK C11'__nDllh
rf ii" _
1-

I11_-_f11G11"6__

PRIME

Size 6 "H,4v3 "00.3 "DAssempled

'2350

SPECIAL PRICING!

Will enable
Digital Clock Kits
or Clock- Calendar
Kits to operate
from 12V DC.
"x2 "PC Board
Power Rea 5 -15v
(2 5 MA. TYP.)
Easy 3 wire hookup
Accuracy. . 2PPM
#TB -1 (Adlustable)
Complete Kit $495

12 or 24 hr.

11,1
ATE
_-

XTAL TIME BASE

Clear Plexiglas Stand

REDOR GREY PLEXIGLAS FOR DIGITAL BEZELS

!
91j6 ea
3 "x6 "x1/8"

-01EIT 1.

60 HZ.

SEE THE WORKS Clock Kit

CABINETS
Great for Clocks or any LED
Digital
project. Clear -Red
Chassis serves as Bezel to
Increase contrast of digital

'

TESTED UNITS ARE CALIBRATED AND GUARANTEED.

&

""!1"1:11131T

MODEL

AMP

12 VOLT AC or

#2001

POWER SUPPLY KIT

DC POWERED

JUMBO .4" RED LED'S BEHIND RED FILTER LENS WITH CHROME RIM
12/24 -Hr. TIME FORMAT
SET TIME FROM FRONT VIA HIDDEN SWITCHES
STYLISH CHARCOAL GRAY CASE OF MOLDED HIGH TEMP. PLASTIC
TWO WIRE NO POLARITY HOOK -UP
BRIDGE POWER INPUT CIRCUITRY
OPTIONAL CONNECTION TO BLANK DISPLAY Use When Key Oft in Car, Etc.I
TOP
QUALITY PC BOARDS & COMPONENTS - INSTRUCTIONS.
MOUNTING BRACKET INCLUDED

VARIARLE FROM 4 to 1V
SHORT CIRCUIT PROOF
723 IC REGULATOR
2N3055 PASS TRANSISTOR
CURRENT LIMITING AT I Amp
KIT IS COMPLETE INCLUDING
DRILLED d SOLDER PLATED
FIBERGLASS PC BOARD AND
ALL PARTS (Less TRANSFORMER(
KIT1PS -01 $8.95
TRANSFORMER 24V CT will
provide 300MA at 12V and
Amp at 5V.
$3.50

KIT 42001

COMPLETE KIT

$2795
L
EA

OR

MORE

$2[95
JJ

TESTED
ORDER 82001 WT [LESS 9V. BATTERY]
Wired for 12 -Hr. Op. it not otherwise secified

ASSEMBLED UNITS WIRED

ea

&

*379E!

Power/Pack
pAC
3

-1

OR

MORE

EA.

$3595
ea.

C
OIPTOELECTRONICS.

HOLLYWOOD, FLA. 33022

PHONE [305] 921 -2056 / 921 -4425
BOX 219

hi CIE

ORDERS TO USA &CANADA ADD 5 % FOR SHIPPING,

HANDLING & INSURANCE. ALL OTHERS ADD 10 .
ADDITIONAL $1.00 CHARGE FOR ORDERS UNDER
$15.00 - COD FEE $1.00. FLA. RES. ADO 4"1. STATE
TAX.

CIRCLE 49 ON FREE INFORMATION CARD

www.americanradiohistory.com

BANNAMERICARI]

a.lr.,AY

A.

EO

co

99

VARIABLE POWER SUPPLY KIT

Continuously Variable from 2V to over 15V
Short -Circuit Proof
Typical Regulation of 0.1%
Electronic Current Limiting at 300mA
Very Low Output Ripple
Fiberglass PC Board Mounts All Components
Assemble in about One Hour
Makes a Great Bench or Lab Power Supply
Includes All Components except Case and Meters
1N34
15270
1X914

211918

2612509

252920

283904
2Ng122

284869E
214888
7112

10/51

431
25/51
$1.00

52.00

5031

431
431

NPN High -Speed Switch 75ns

UHF Transistor -Oso /Amp up to l GHz

P-

Channel FET Amplifier 2500umhas

NPN Dud Transistor 3mV Match a

NPN Amp/Switch dl OO 40V 200m

111458

10483 re

+t;<

N.Chennel PET VHF RF Amp

N.Chmnd PET Highspeed Switch 10:r

TO.220

Mounting KitMica rowing, &bushing

LMIZ3CN
LM747
2102

ADD $1.25 FOR POSTAGE /HANDLING

Low Bias Current op Amp -Super 709

5 Volt Regulator
TO-3
Adjustable Voltage
R
Regulator
2.37V
A
2 Wan Audio Power Amplifier
OIP
Phase Locked Loop
DIP
Precision Voltage flaguletor
Dud 741 Compensated Op Amp
1024 -8it Static RAM (1 020 a 1)

231

231

55558V
8038
8223

1031

L0.10

RF /IF

Amplifier

OC

14
331

DIP
mDIP
mOIP

256.88 PROM 132

LOGIC PROBE

CMOS,

RC4195DN !153

LOGIC PROBE KIT -use with CMOS. TTL DTI... RTL. HTL, H;NIL am most MOS lc's.
Built in protection against polarity reversal and ove,voluge. Draws only a few mA from circuit
under test. Duel LED readout. Complete kit includes use and clip leads.
ONLY 57.85
FIXED REGULATED POWER SUPPLY KITS- Shartoirc l proof withh thermal cu
limiting. Compact size am typical regulation of o.5% make mese me4 for most electronic
propels Available for 5V @ 500m3, 6V @ 500m. 9V P 500m, 12V @000mO. ISV @

300X0 Specify voltagewhen ordering.

48.95 ea.

Thee easy-to-assemble kits include all mmponants complete detailed inu,ectmre erO plated
tlWrslau PC hoards. Power supply kits do not include oe ar meters. Add 51.25 per kit far
postage and handling

WRITE

are new surplus Darts-100%

FOR

FREE CATALOG

functionally tested.
offering o.e, 71X7 semiconductors corned

/ft

15 /51

3/51

431

1X5236

V5139 to
185144

FI411M5z

$1

etc
$7.85

.29

531

LM741CN14
LM747CN

2114955

331

2X3641
2X3543

5 /51

531

2x5087
2X5088

4/51

203543

6/51

285125m

5.20

2113954
x113951

3.20

.tfi %112658CP
.tfi 21400E

3814518

.18

3N1413N

.38

3:7175:
55.505X7476:

A8

055486
055543

205544
0N556

X2.50
11.00

L163208.12
LM320K.15

IC SOCKETS
22

AUGAT WIRE WRAP SOCKETS

-$.48

-8.25

16K
S

PIN -$.33

28 PIN

16 PIN.

Gold Plated
10 FOR $3.95
LIMITED STOCK

s.49

ea.

30V 1N914

641
$0.75
6/$1

6/$1
$5

MOUNT VOLUME CONTROL

Nylon Shaft. 1K or 100K.
YOUR CHOICE 4/$1

-PROM CARD

$69.95 (KIT)

-100( IMSAI / ALTAIR) BUSS COMPATIBLE

IMAGINE HAVING 16K

OF SOFTWARE ON LINE AT ALL TIME!
KIT FEATURES:
1. Double sided PC Board with solder mask and silk screen and
Gold plated contact fingers.
2. Selectable wait states.
USES
3. All address lines and data lines buffered!
2708's!
4. All sockets included.
5. On card regulators.
KIT INCLUDES ALL PARTS AND SOCKETS! (EXCEPT 2708's)
DEALER INQUIRES INVITED
ADD $25 FOR
SPECIAL OFFER: Our 2708's (450 NS) are $12.95 when purchased with above kit.
ASSEMBLED AND TESTED

vi

FULLY STATIC!

$149.00

KIT

8K LOW POWER RAM KIT

-f4I.;

KIT FEATURES:
Double sided PC Board with solder mask and silk screen layout.
Gold plated contact fingers.
S -100 (IMSAI /ALTAIR)
2. All sockets included!
3. Fully buffered on all address and data lines. BUSS COMPATIBLE
4. Phantom is jumper selectable to pin 67.
5. FOUR 7805 regulators are provided on card.
1.

"'^

RAM'S.

- -

Low Profile Socket Set

Support IC's (TTL and Regulators)
Bypass CAP's Disc and Tantalums)

GARLAND, TEXAS 75040

(214)

$179.00
29.95
13.50
9.75
4.50

CALL FOR OUR CATALOG'

WE PAY POSTAGE'
Orders under $15 add S.75. No C.O.D. We
rTERMS:
accept VISA, Master Charge and American Express
Cards Money back guarantee on all items
Texas
271 -2461
Residents add 5% Sales Tax

Digital Research Corporatio

BOX 401247

USES

21L02 -1

P. O.

ax?dowk

Fully Assembled and Burned In

Blank PC Board With Documentation

PRICE WAR!
For a limited time only:
IlLBuy two 8K Kits for $129 ea.

CIRCLE 71 ON FREE INFORMATION CARD

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1.75
.84

CA3085
C3885

1.45

RC/1940

2.50
2.50

.65
.55

11G186TN

RG1950X
RGI95TK
L14425001

115
2.25
2.00
.55

N5556V
115558V
NSSSBV

.50
_95
.50

3.75
.89

FSA2501M Diode Array

2/$1
MPF102200MHe RF Amp
3/$1
40673 MOSF ET RF Amp
$1.75
LM324 Quad 741 Op Amp
.94
LM378 Pos Volt Reg mDIP
.55
NE555 Timer reDIP
38
LM7232 -37V Reg DIP
3/$1
LM741 Comp Op Amp OaDIP 6/$1
Dual 741 rtoy
3/61
CA3D58 Dual 7s Array P
.62
RCA29 Pwr Xstor lA 35W
.70

10/$1
20/$1
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Germanium Diode
100V /10mA Diode

.80

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CA3045

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555X Timer 1ps.lhr Different pinout rom 555 Iw /data,
RC4194TK Dual Tracking Regulator 0.2 t0 30V @ 200mA TO.66
RC4195TK Dual Tracking Regulator I15V @ 100mA (TO -66)
8038 Waveform Generator .I A Wave With Circuits & Data

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TERMS: Send check or money order ILLS, funds, wdh order. Add 5% pmuge a, US.,
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Requires only unregulated DC (16 -30V) and 2 bypass capacitors.
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$1.25
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$0.95
LM1304 FM Multiplex Stereo Demodulator DIP
0.99
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1.00
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1031
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331
$0.75
331
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251893
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252369
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104372
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4/51

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$1.75
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to 120MHz

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10962 to
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103064
IN 3600

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204122
50.29 204124
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831 2X1711

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4.Trensistor Array /Dadinpton

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71574

LM3800
NE5654

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211718
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N- Channel Audio F ET Super Low-Noise
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LM308H
LM3091(
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2X706

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7400N

/e':

TTL

rlrrr

SN7/00N
SN7401N
SN7402N
SN7403N

.16

5N7472N

39

SN74160N

18

514741314

.39

S747416114

SN7471N
SN7475N1

35

SN74162N

20

.50

SN74D4M

20

SN717671.

35

SN7/05N
5N7106N
SN7407N
SN7408N
SN74WN
SN7410N
SN7411N
SN7412N

20

SN7479N
SN7480N
SN7482N

5.00

51174163N
SN74164N
SN74165N

.20

as
35
20

S147483N

25

SN7485N
5147486N

SN7488N
SN7489N

69

5147490N

45

SN7491N
SN7492N
SN7493N
SN7494N

.49
.49

SN7420N
SN7421N

20
39
49

SN7497N
56174100N
SN14107N
SN74109N
SN74116N

37

29
37

.42
25

5N74121N

25
35
35
25

01174122N
SN74123N

.21

SN74132N
SN74136N
SN7414114
SN74142N
SN74143N

SN74125N
01471126N

89
69
75
75
75

51414144N

39

SN71173N

3.50

75

125

51474182N
51174184N
51471185N
$14711491

39

5N74187N

.95
1.95

51174188N

79
79
3 00

2.95
3.25

SN71147N
SN74118N

235

25

SN7415014

125

25

SN74151N
SN74153N

SN7459A

25

SN7460N
SN7470N

25
45

5N14154N
SN74155N
SN74156N
56174157N

1.79
1.25
89

89

15

79
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1.25
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.89
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1.19
25
49

cD4010

49

C0401i

23

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054013

25

CD4014
CD4015

I.39

19

004019

49

CD4020
C04021
C04022
C04023

1.19
1.39
1.19
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019024
004025

79

CD4026

125

25
99
89

LM3U0H
LM301H
LM301CN
LM3g2H
LM304H
LM305H
LM307CN
LM308H
LM308CN
LM309H
LM309K
LM310CN
LM311H
LM311N
LM317K
LM318CN

.2.25

SN71393N

2.25

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ro,

741574

15

2.95
29

1.25
1.25
1.00

LM747H
LM747N

18MG

15

30

1.35

741.500
74L502
747503
747504
741.105
74L508
741510
741013
741514
741.520
741526
741927
741528
741530
741.032
741040
741042
741547
740551
741.555

LM741-I4N

1.50

35

1.35
1.35

25

1.25
25

25
1.25
1

1.25
1.25
5.95
1.40
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1.35

LM1458C11

8.00

LM1496N
1141556V

LM3909
LM5556N
MC5558V
LM7525N
LM753/N
80388
LM75450
75451CN
75452CN
75453CN
75454CN
75491CN
75e92CN
75494CN

5.00

600
1.75
1.25
1.75

1.95
1.49
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LM709H

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LM709N

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LM710N

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74L593
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741.5109
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7415139
7415151

7411153

160

74LS164
7415175
74L5181
7415190
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74L5192

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7415193

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7415195

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1.25

125
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125
1.25
1.25

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1.40
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75

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1.50

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7415279
7415367
7415368
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39
39
39

39

80
95

325
25

1.50
1.95
1.95
1.95
1.95
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1.95
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249
2.49
2.49
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169
1.75

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puler 01$ mpuo ap ama o1
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dens

Mien tuo

Ibmugn

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50526

Green

4/51

Yalow

4151

X0526

Yellow

4/51

X0526

Clear

4151

Rl

4151

MAN
MAN
MAN
MAN
MAN
MAN
MAN
MAN
MAN
MAN
MAN
MAN
MAN
MAN

Common
Common
Common
Common
Common
Common

7G

7Y
52
79

72
74
81

82
84

3620

3630
3640
4810
4640

MAN 4710
MAN 4730
MAN 4740

MAN 4810
MAN 6610

4 95

187

1.95

Cathode-red

Mode -red

1.95

Mode -red
Common Anode -red

.300

Common Calhodered
Common Mode-yellow
Common Anode- yellow
Common Cathode-yellow
Common Anode -orange
Common Modeorange -1
Common Cathode- orange
Common Anode -orange
Common Cathode- orange
Common Anode -red -1
Common Anode-red
Common Cathode -red
Common Anode -yellow
Common Mode- orangeD.D

.300
300
.300
.300
300
300

1.25
1.25
1.50
1.00
1.00
1.00

Mode -yellow
Anode-green

xC556
X0556

Yellow
Orange

4.51

70556

Clear

.300

300

35

75

300
400
400

1.00
1.00

400

1.00

400
400
560

180

01.707
DL741

Common Cat naered

DvOO

Common Cathode -red

Common Cathode -red
Common Ca0o0e (FN0359)
Common Cathode 1FN05001
Common Anode IFN0510/

FN070
FNO507

5082 -7300

4 0 7

5082 -7302
5082 -7304

50817340

2 15

CA3082
CA3083
CA3086
CA3089
CA3091
CA3102
CA3123
C3130
CA3140
CA3401
CA3600

35

130

CA3053
CA3059
CA3060
CA3080
C3081

50

3.25
7.25
85
00

SDI

01911-9H00

Dg9080P

$ 11
20

16

Pn
pm

18

pin

21

00

14 pm

3 50

85

XR-221ICP

139

8R-1310CP
XR 1310EP

1.25

AR

49

50-100
5

19

1P

22

21

20

29

30
42

Jb pIn
40 pin

24

32

29

35

a;
38

35

pm
pin

45
39

dl

37

14
16

pm

43

42

pin

75

68

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38

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27 OHM

33 OHM

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ASST. 6
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5 ea.

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dl

56 OHM

100 OHM

120 OHM

150 OHM

270 OHM

330 OHM

390 OHM

680 OHM

520 OHM

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15K

18K

2 76

33K

39K

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12K

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274

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120K

180K

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330K

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560K

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1144305

75

28

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65

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14C00

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MC14410
MC14411
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SN74170N

30

35

SN7432N
SN7437N

70

.89

20

SN7413M
SN7414N
SN7416N
SN7417N

SN7422N
SN7123N
SN7425N
SN7426N
SN1427N
SN7429N
SN7430N

99

SN74166N
SN74167N

50

BUGBOOK
Continuing Education Series

16

14

11

.76
.15

14

11

.13

10

.15

13

16
.14

74
.12

50

15
16

.13

.10

14

10

12
19

2626

EMhm contains 350 wires

BREAD BOARD
m
IWJU_MPER WIRE KIT'mm0rme0'sln 9ed
449IN

4114

JUMPERS

All wire is solid tinned 22

gauge with PVC insulation
Th. woes come packed in
a convenient 07a1, box

Length

No. of Contacts
26
26
40
40
50
50

924003 -066
924005 -18R
924005 -06R
924006 -18R
924006 -06R

18"
6"
18"
6"
18"

ea.
ea.
ea.
ea.
10.31 ea.
9.15 ea.

Angle
straight
right angle
straight
right angle
straight
right angle

26
26
40
40
50
50

No.

Pad

CH1A

2000 MHz

HC33

CY3A
CY7A

cY12A
CY14A
CY19A
CY22A

09308

He. 40 BIT

:551

1024 Static

5 95

xao

6 95

16,4Reg

395

395
00

32 COI

00

02:

OOnami1
Oua' 256 BIT
bur 512 BIT

95

00
95

ea

Owed 80

Char
Char
Char

2101
2102

1024

$d
$4
$4
54

upper case
Gen lower case
Gen
2048 BIT (512% 4 on 25658)

S 9

11090
4033
8720

1495

5197
H00165

4.95
14.95
1.95

1100 Spacing)

25.00

8111

256

51011

6 95

51a1r

3r

93421

HEAT SINKS

27

(cannot be snipped via

--

enough for

X A -1

702A
82523
525123

Etched Circuit

Irl6 Epow giant

22/44
8800V

45

3 49
2 95

24.95
7.50
22.00
7.50
17.50

0187208
ICM7209

0650200
OS0028CH
TIL308

PHENOLIC

EPDXY
GLASS

EPDXY GLASS
COPPER CLAD

Hole Spacing

Pall

$4.95)

No

64P44 062/00(P
169P44 0620 50P

450

64P44 062WE
80PO4 062WE
169P44 062WE
169P84 062WE
169P44 062WEC1

4 50

50

4.50

450
85o
4

50

56

2 31

1700

504

4 53

17.00
17.00

9.23

8.26

6 B3

6 12

32

keyboard features 63

any kind

molded

01 P C

ruts most

Encoder Chip )encodes 16 Keys)

Encode/ Chie encodes 68 Kent

00x5115 13

A
x

9.95
2.95
95

5 95

dust cover
Size: 201N x 93/4"H x

Model 10

.BngM 60

---

Model 10 Kit

5au

59.95

-ined

very sold
4
base

apdreatgm
$7.86 ce,

014.0

$39.95
$49.95

Heavy Duly Carry Cace$5.95

Stop Watch Chip Only (7205)

$19.95

31/2DIGIT DPM KIT

Auto Polarity
Low Power
Single IC Unit

New Bipolar Unit

Auto Zeroing
.5" LED

$134.95 Model KB500 DPM Kit

Model 311D -5C -5V Power Kit

MAX -100

50-400 H2

IS

4.5'

twin car Dater,

Charger /Eliminator

Model too

use 00001

Model 100

use 110 V AC

cIA 53.96
CAI

$9.95

5.8" x 4 5"
7" o 4.5"
9" x 6"
9.5" x 8"

12 or 24

16 PIN
24 PIN
40 PIN

39.95
59.95
79.95

ENCODER 19 -KEY PAD

$4.50
4.75
8.50
13.75

14 PIN

DM1

Circuit Designer

DM2

$69.95
Function Generator

DM3

ABCDEF

Shift Key
2

OT

type
-595

U.S. Funds Only

Add 6% Sales Tax

Spec Sheets

250

250
1000
2 25

OT-35S

350
bus strip
180
120

80
70

3 25

-12S

TABS

O7

12 50

bus snip
bus strip

0T,5

puce

590

470

T.185

07.355

aloses

T.47S
07 -47e

-125

OT85

INSTRUMENT /CLOCK CASE

01.598

0T35B
OT

arH

75
75

4
3

9.95

Expenmentor 600

510.95
1978 Catalog

Dater Information Available

ELECTRONICS

1021 -A HOWARD AVE., SAN CARLOS, CA. 94070

PHONE ORDERS WELCOME
(415) 592-8097
All Advertised Prices Goon Thee January

CIRCLE 21 ON FREE INFORMATION CARD

www.americanradiohistory.com

$3.95 ea.

200

Experimentor 300

James

Infection molded unit. Complete

with red bezel. 414" a 4" a 1- 9/16".,

50

300

Seid 350 Stamp for

Optional Keys

$10.95 each

RC Bridge

$74.95
I

DESIGN MATES

$84.95

0f-598

$16.95
HEXADECIMAL

PROTO CLIPS

19.95
29.95

1111aTtes

NOW

a
walnut rase
5 of 6 x24 +I
MAN72nmutated
high brightness muff
MM5314 cock chip

KIT ONLY

115 VAC

$74.95

OT-475

CLOCK

a low COSI drgrl.0 clock r

very high qua1M unl the

4E:0011

torus

ACCESSORIES FOR MAX 100:

Mobile Charger Eliminator

CS

P5101 -

$49.00
$17.50

JE700
The

UT PROTO STRIPS

--

1n

- -

Assembled

$295.00

Four power soutes.

e
batteries. 110 or 220V win
12V with auto
tighter adapter and external
7 2.10V power suppy

5563"

or CMOS Devices

S5.00 Minimum Order

Calilomla Residents

ant

Kit

-5495

Moeano Manual

Size-

0-10004

MONITOR

= =

STOPWATCH

Times to 59 mmuies 59 59 seconds

Crystal Controlled Time Base
. Three Stopwatches in One
Times Single Event
Spirt 6 Taylor
S1ze45 5215'5 90 6114 ounces/
. Uses 3 Penile Cells

5229.00

Model 10 Assembled

P6104 P6203 - 9.75 x 61/2 x 23/4

80.00
PB203A - 9.75 x 61/2 x 23/4 129.95
LoODGTC

gnDIGITAL

15''D

$149.95

applications
Troubleshooting microprocessor
address. instruction. and data flow
Examine contents of ROMS
Tracing operation of control logic
Checking counter and shift
register operation
Monitoring I/O sequences
Verifying proper system operations
during testing

Fully Automatic
Portable
com9etely

rmrla.ew. n... OT-35r1.

$29.95

PLL System

Slide Controls
Automatic AFC Control
4 Speaker Output
Walnut finish vinyl covered
wood veneer with smoke

Model 8365

0.10000

PB100

in
a,

BSR Record Changer

895

95

crystaftonlroeed ifinesase charger

ohm resolution

PB102 PB103 -

1.86

rgv coooerdvoe
ar.r 0,

100 MHz 8 -Digit Counter

DC Voltage

wider

rodeo 5P5T keys unattached

AV-5-2376

long X 4.

154
3

(RC

111

AM /FM 8-Track Stereo Receiver

With BSR Changer

4.95

CT7001

20 Hz -100 MHz Range

6' LED Dlsptay

BOARD

up

172
3.69
2.07

9 95

GMG

Accessories:
Adapter BC -28
$9.00
Rechargeable
Batteries BP -26
20.00
Carrying Case LC -28 7.50

o7eraung manu,'
;nd spare fuse

16'

6.50
17.00
6.50
8.50

me

Response

.19==

63 KEY KEYBOARD

\.......1100165
X00165

mv. 1Va, 0

$1.75

Price
1 -9
10

Panern

vOMmOscAlamr

u,

III II

$15.95

7.50
8.95

..4 un

AC

oad..,

PROTO

2.95 ea.

Power RegaIremeMS
Physical

"x44-42'

Cornes with lest

$1.60

$19.95 ea.

3 50

10 50

CONTINENTAL SPECIALTIES
Other
Preto Boards

.25

plugboard -Epoxy Glass

complete
with heal.lnk and mounting hardware
16 cooper clad
5 313 X 10 X

Mc3061P
804016174416)
MC1408L7
MC1408L8

3 75

dl,

allow for operaier between 1000 Hz and 2410 H;

EIA R5-232C or 20 r0A current Mop (receiver rr
optolsoAied and non -pour
120 VAC, single phase. 10 Walls
All components mount on a single 5 by 9
components
printed

Digital Dale Interlace

59.95
4.95

MM5311
MM5312
MM5314
MM5316
MM5318
MM5369
MM5841

25

1/16 VECTOR BOARD

--Li..La

CLOCK CHIPS
51645309

951190

46 dbm axqusucalty coupled.

15 dbm nominal. Adiustabl (rom -6
-20 dbm
Frequency reference automatically adiusrs
Ib

Receive Frequency Tolerance

34.95

3.95
25001set
11.95

9368
LD11O/111

Receive Sensitivity
Transmit Level

Re

Edam
Open Collector lpolar

19 95

Receive Channel Frequencies

Transmit Channel Frequencies

selectable).
300 Baud
Asynchronous Serial (alum te mark level requlre.:
between each character)
2025 Hz for space. 2225 Hz for mark.
1070 spat.
Switch selectable Low (normal)
025 space, 2225 mar*
1270 mark. High

OC/AC Current. 0 -100mA

Resistance 0.10 meg ohm
Size 64'

Model 2800
$99.95

22 pin double readout

Universal Mvrocomputen Processor

VS

Trr-slale Bipolar

Analyzes any type of digital system

Checks data rates in excess of 8
million words per second
Trouble shoot TTL, CMOS. DTL. RTL.
Schottky and MOS families
Displays 16 logic states up to 8 digits wide
See ones and zeros displayed on your
CRT, octal or hexadecimal format
Tests circuits under actual operating conditions
Easy to assemble
comes with step -by -step construction
manual which includes 80 pages on logic analyzer operation.

Fres

6.95 ea.

.795

256

Model 100A assembled 1295.00

9.95 ea.

5 OP

SI`1r

includes power supply!

155
P C Tabs -spaCed
Mating connector for piug5bard

/km

1,slaie

f.

1024

only add wale,

P- Panern -44

Os

lee

7205
ICM7045
1007207

Maximum Data Rate

Data Format

prom

DC Accuracy Ma typical

65

18

Model 100A

AC Voltage

Sol

3662

12

Open

25654

Logic Analyzer Kit

Model

Ranges:

529.95 ea.

another modem and Mrminal for telephone -hamming" and communication+

ne deaf In addition. It is free of critical adluslnrenis and is buis with non- precismrr
canny available pans.
Frequency-Shift Keying, full -duplex (half -duplex
Data Transmission Method

PARATRONICS

all

Complete Inl

995

Farns

12

Pennywhistle 103 is capable or recording data to and horn sumo lape who,
speed requirements for the recorder and d O able to communicate O0act4

5.05

lamas

1024

145281

Overange reading
10 meg input Impendense

680-.75A

6330.1

13 50

$3.25
$4.95

25

63011

MCM6575

**

2 for

P/Mmlc se Nn

2048
1048

5203

(II
cloud bonds

Plugboards

Static
oyynamic

2718

13 50

$1.95
$2.49
$2.95
$6.95
$6.95

Elch Materials

P C

PARATRONICS TRIGGER EXPANDER - Model 10

--

XA-

Sul,
5uIr

PROMS

Battery or AG operaton
Auto Zeroing

Beryllium Copper w -black finish fer T0 -5

Aluminum for T0 -220 Transistors 8
Regulators
680 -.75A Black Anodized Aluminum for To -3
Dude 4
Black Anodized Aluminum
predrilled
mounting holes for T0 -3
43A x 1'/4 X 2"

32

.
+

IMM5262
2K.1
UP0414(2104)4N

Overload Protected
3" nigh LED Display

205 -CB
291 - 36H

Etching Kits

x
+

224
256
256

:o

5.95

1.95

2.00
7.95
13.50

Fits .054 to 070 P.0 Cards

PLUG
SOCKET

205 -CB

shirr

Adds 16 additional bits. Provides dg itai deleY and qualification

of input clock
4
and 24-bit trigger word.
Connects direct to Model 100A for integrated send).

54 95
54 95

Ttie

Featured on February's Front Cover of Popular Electronics

25 PIN -D SUBMINATURE (RS232)

DB25P
D025S

5101,
Statrc

'4200

9.95

MCM6574

(Model 100A Manual

$4 95

(Solder Eyelet)
(Solder Eyelet)
(Solder Eyelet)
(Wire Wrap)
(Wire Wrap)

urn,

10 95

65C146571

156 Spacing -Tin- Double Read -Out

PINS
PINS
PINS
PINS
PINS

95

19.95
3.95
7.50

55.00
8.95
17.5o

PRINTED CIRCUIT EDGE-CARD

15/30
18/36
22/44
50/100
50/100A

Siano

16+4
256k4

31/2-Digit Portable DMM

95
7
95
6 95

Stan

8101

3601

Gen

49

Dy

21102/91102

S5 95

CONNECTORS
Bifurcated Contacts

256+4
,

95
95
95
95

"Pennywhistle 103"

m01

4096 I 1
256 5 4

8599

2.95
1.95
3.00

Dual 132 Be 85R

5'2 Dynamic

9374
825115

55.95
$5.95
$1 95]

HCrB U
HC18 U
HC18 U
HC18O
HC18 U
HC18 U
HC18 U

18 000 MHz
20 000 MHz
32 000 MHz

2519
2522
2524
2526
2521
2529
2532

Ay.5d376

Pries

HC33 /0

2.010 MHz
4.000 MHz
5.000 MHz
10.000 MHz
14 31818 MHz

re.

AY3.85o0-1
AY.5.91W
AY 5.9200
00.5.9500

Price 513.80 ea.

CY2A

SRS
'024 Dynam c

256

SPECIAL REQUESTED ITEMS

2.30 ea.
2.36 ea.
2.82 ea.

THESE FREQUENCIES ONLY

Frequency
Case/Style
61033 U
000 MHz

ICY2.01

CPU

,101

2107 5280
2111
489

29.95

25'8

FCM3B17

CRYSTALS

Periph. Interface Adapter

128 e 8 Static RAM
1024 x 8 Bit ROM
CPU

$2291.0000 /kit

contacts: 26

of

16.00
26 50

CPU

2504

1.4815230

Permits instant line -by -line switching for diagnostic or OA

testing. Switches actuated with pencil or probe tip. Mates with
standard .10" X .10" dual -row connectors. Low profile design.
Switch buttons recessed to eliminate accidental switching.
-26

8 BIT

2513121401
2513130211
2516

INTRA -SWITCH

13

Super 8008

2650

ROM'S

Provides both straight and right angle functions. Mates

with standard .10" x .10" dual row connectors (i.e. 3m, Ainsley.
etc.) Permits quick testing of inaccessible lines.
Price $6 90 ea
Pan No.: 922576 -26
No. of contacts: 26

Pan No.:

8080.

LIART'S

Price
$1.28 ea.
1.52 ea.
1.94 ea.

8 Bit MPU

RAM S
CPU 'S

305 Baud

INTRA -CONNECTOR

11)

4.95

15.95
6.95
Bi- Directional Bus Driver
9.95
Clock Generator /Driver
10.95
System Controller Bus Driver

$19.95
24.95
15.00
6.00
15.00
29.95

CPU

CDP1802
MC6800
MC6820
MC6810AP1
MC6830L8
Z80

Priority Interrupt Control

boards for instant

PC

$16.00

CPU
8 Bit Input /Output

.56'o

plug -in access via socket-connector

jumpers. .025" sq. posts. Choice
of straight or right angle.

No, of Posts

8080A
8212
8214
8216
8224
8228

PB0e5

Price
$ 5.38
4.78
8.27
7.33

6"

Solder to

JUMPER
HEADERS
Part No.
923863 -R
923873 -R
923865 -R
923875 -R
923866 -R
923876 -R

and

Mates with two rows of .025" sq. or

dia. posts on patterns of .100"
Probers and
s shies in back.
Probe access holes in back. Choice
of 6" or 18" length.

SOCKET

Part No.
924003 -18R

is

90' M
neutron
Wire length a classified
by color coding
the leads are bent

easy

$10.00 /kit

JK1

iTifi

Each woe

The Incredible

MICROPROCESSOR COMPONENTS

14 different lengths

cut

JE803
ins Log, 0robes

PROBE

seta

mdesoens,ble m 0oub

wn.,n ,,o, t,, ,o51 oat

shooing IngK 1am40s

T1L DiL RTL CMOS II derives the power a

needs t operate directly on of the cocon undo
test. draa wing a scant lo mA mas It uses a MANI
to indicate any of me following SraleS
these symbols PO
IOW] oIPUL5E1 P The
Probe tan detect high frequency pulses to 45 MHo
It can( be ased at MOS revels or 11101II damage
will result
1

1978
CATALOG
NOW

AVAILABLE

--

-_

'Wow

$9,95 Per Kit

printed Coco! t board

PI_ 5V 1A Supply
This is a standard TTI power supply using the well known
LM309K regulator IC to prowde a Solid 1 AMP of current at 5
volts We try to make Minos easy for you by prowmng
eveMnmgyou need in one package including the hardware

for only

$9.95 Per Kit

109

AI\
***

NEW YEAR SALE

10 % discount on

TAB

SCR

-SUPER SPECIALS360MFD. 600VDC

PHOTO FLASH CAP.

lus,

1702A 2K,

SP425 SPERRY

EPROM

digit!

"'tiV

multiplexed 7'seg.
MM5369 time base'osc. chip
T.V. crystal for above
1101A 256 x 1 MOS RAM
93410 256 x 1 45NS RAM
75451 peripheral driver
7402 TTL nor gate
7430 TTL nand gate
CERAMIC FILTER 10.7 MHz.
MM5058 1024
static SR .
U715 6019z. op-amp
.
745206 256 x 1 45NS RAM
78L2.6 2.6V T092 .1A +regul.
"
"
78L05 5.0V "
78L6.2 6.2V
"
"
"
78L12 12V
"
"
"
.

79MG
7805T

"

"

"

- reg.

"

tab IA 5v regul
to -3 IA +12V regul.

7812

SWITCHES

20
50

20
90
29
29
29

RED PUSH BUTTON

N.O. MOMENTARY
CONTACT
30

each

100

$1.50
95.

.--- ,..-

S:

10r 1201
s:at 1.aX

s6R

2701[

1.W

x.yX

$ 44.95

221 -34

221 -46

612007 -1

-42
221 -45

221-48
221 -62

1_193089

'221

$2.25 ea.
L
10/ $20

IN2111

4 PDT

3A

w/low

lens
w/high lens

DELTA

la

P.O. Box 2,

Oakland St.
Amesbury, Mass. 01913
(617) 388 .4705
7

onwe
Boston, Mass.
ELECTRONICS900UCoo

W JsltltJtE

lth

Ave.

ATLANTA GA.

DELTA ELECTRONICS HOBBIES

5151 Buford Hwy. Doraville,
Atlanta Georgia. (Retail only)

CIRCLE 55 ON FREE INFORMATION CARD

/4X1 /4X1/4

DALE

$950
KHP

YIDEOCUBL TY COMPUTER INTERFACE InteerfaOce device

that inpterfaces any video oNtp t device toa TV receiver. OK'd by
erortpaartlalhl kite. Partial kit has all had io get parts.
We include re
issue
RADIO-ELECTRONICS.
CK
Tpele
witI daEtOa$i3 95ro2/26u00st
STOCK NO.5500RP Partial kit with data.
$9.95 2/18.00
Enclose sufficient postage, excess
refunded. All mail orders to
BOSTON, MA.
P.O. Box 2, Amesbury, Ma. 0191 zDELTA ELECTRONICS WARE .l only).

$4

FOR

ALL TOGETHER NOW!

The acclaimed Equinox 100 mainframe kit ($799) is now
complete S -100 system.
Because now there is an Equinox 100 I/O interface kit
($120) that handles the hard work of interfacing all your,
a

11

'

Relay
Contacts

1-- -s-1

4,11

'- i
'

i"
.,

Ituj

24VDC COIL
650 ohms

..

..

__

peripherals.
And Equinox 100 4K memory kits ($109). Assembled 8K
memory boards ($188). EQU /ATE editor/assembler and
BASIC -EC software on cassettes.
It all goes together. It all works together. Its all together
now at special system prices.
See The Equinox System
at your local computer shop.
Call toll-free to 800 -648 -5311. BAC/MC accepted. Or write
Equinox Division, Parasitic Engineering, P.O. Box 6314,
Albany California 94706.

l8

use your low frequency counter to weaeurs

VHF or igP frequencies.
byut
This kit will divide the
input signal by ten
0 Or 100 with 63Q6 option)
Kit contains drilled
board. 2 X010131
rc'., all pert. needed and instructions.

<ii

6501)5r

/
0
`

.
/

of LED's

s
rating /with heat
ran be pulsed at
uou
p to ]SA with
ycle. Data supplied u /order

eioil utyo'.
log duty

99 ea'

Visible Red with low 1.n.

visible Redd with high lens

/ 78V
POBOX
OX 41778

///

YYY

Sacramento Ca.
i

916 334 2161

Cndrrase
and

are

option

p..

t part
not
t

112.95
N /11090

IC

9.95

port- .apply
kit--er

TOt92 TRANSISTORS
TO FIRST QUAAISY TEDSTIP
TRANSISTOBS ASSORTED TYPES
PNP
NPN AND EVEN A FEW
DARLINCTONS.. THESE ARE
NOT U -TEST SPECIALS FROM FACTORY
REJECT BARRELS, BUT FIRST QUALITY
PARTS WITH HOUSE NUMBERS.
JUST 25)51 AVAILABLE-SO STOCK UP
NOW ,
FIFTY FOR

..

g2.

Money back guarantee- $s minimum order.

we pay post on orders for $10 or more.
All
U.S
orders must include post BAi
BAC & MC are
not prepaid orders and hipping is ad.r
4811 MYRTLE AVE

R
B
Y LO i1
ELECTROr1ICS

F3
110

39

27

TV REPAIR INTEGRATED CIRCUITS

Type

oy
*Tr.
Ul: {.l'

95841

68K

Mt

'

le

150L17n00. KIT

are mounted on a TO-5

eager with a 6/32 threaded stud to secure
to a heat sink..
TWO AMPERES max. ro in

120
160
270
390
I.2K 1.8K 2.7K 3.9t
12
ask
2. 31K

2/28.00

Mhz Prescaler

SUPER LED's

'NCH

82
820

10.519I
JUI
$
1.60 ea
tactual
ize

10.

s 49/c

405

LE'

CO

120V0

ea

Red
Red

In

'o,,

fen $6

Infra
Infra

Illa

3.9
56
560
5.6K
5K

mfg.

'

ROKRNS, HARDWARE

YE2

1/4W 5%

1004a

actual size

JBT MR1 -223 5 AMP DPDT

ROCKER SWITCH WITH PANEL

This family

1.

$14.95

This op -amp board contains 31 LM741 op -amps, 32 tranSistors,

over 75 1% precision resistors, 12 dipped tantalum caps, loads
of resistors and diodes and more. A parts bonanza.
$8.95 2/16.00
STOCK NO.6561 R Parts board.
HEAVY DUTY POWER TRANSFORMER, 12 volts @ 5 amps,
24 volts @ 9 amps, 14 volts @ 20 amps, 125 volts @ 1.5 amps.
Also has double primary. If put in series, all voltages above
are halved. Extra primary winding may be used as an isolation
winding, as may the 125 volt secondary. Great for bench
supplies, CB power supply, high power amplifiers, computers .
etc. 15 lbs. 53/4 "x5 "x4Vz"
2/34.00
STOCK NO.6675
With Data
$17.95
an

metal cabinet

12

P.

100 -

with

BRUMFIELD

EXTRA SMALL D. D.T.

3A 125VAC CONTACTS

RESISTOR ASSORTMENT

POTTER

MINI MINI TOGGLE

each

--I

DIP TRIMMER
- AIN
TURN
5K or 20K only

22
195

1000

.I\

1.39
.89
.59

,,

pdigit

"d-

14

.29
"
"
"
.29
tab .5A + regul.
.59
term. adj. .5A + reg. 1.29

78MG

40.89

75

KIT

built
endddRCAcoubter

'

.85
40

our regulary avertied price.

6560R Crystal Oscillator board

1.00
5.00

5 latch,7 i driver

16

5.00
2.00

.65

CRYSTAL OSCILLATOR BOARD, removed from a MODEM.

Has VECTRON CO -231T crystal oscillator, with tuning option
for accuracy of .0001 %. Crystal Freq. is 4.9152 Mhz. which
divides conveniently to many useful) frequencies, including 100
Hz. We provide data showing TTL
Hz, 60 Hz, 50 Hz, and
chips to get these frequencies. Current VECTRON price for the
crystal oscillator is $85.00. Board contains many other parts,
transistors, op- amps, caps, ICs etc. Selling for 2.00 less than
1

2.50'

NUMITRON display. PCB with plated thou

hole and inetruetiona supplied
KITS SUPPLIED PROM ONE TO T@2 DIGITS
PER BoaxD (all tncerconneece places)..

.59
.

10/22.50

COUNTERhDISPLAY
747

.90
7 95

4A -400V .2MA GATE

Ideal module for

1.25
1.75

bit

15V
5V

2N5559B (IfP707) NPN SI TO-3 400V l0A 125W EA. 2.50

TIP31A (IP245) NPN SI TAB
40
60
.30
3
2N6101 (55004)
NPN SI TAB
80
10
75
.65
\\D41D1
PIP SI TAB
1
6
.25
30
MPS5172(HEP56)
NPN S TO-92 25
.2
.12
.1

2708
1024 X 8,450NS, EPROM $20.95
DIAC 27 TRIGGER DIODE
.20
PULSE XFMR. 1/I TOROID- ENCASED
.25

78/405

**

**

TRANSISTORS

C106D1

78L15

ds

orders of *Feb.1,78 *

$100 or more
a

CRYSTAL OSCILLATOR BOARDS -OP -AMP BOARDS

CIRCLE 65 ON FREE INFORMATION CARD

BANKAMERICARD

THE EQUINOX SYSTEM" When you put it together, it's really together.

CIRCLE 77 ON FREE INFORMATION CARD

www.americanradiohistory.com

10mA

600v
1000v

1A
1A

10mA

75v
6.2v

1N758A
1N759A
1N4733
1N5243
1N5244B
1N5245B
C

100v

10v
12v

5.1v
13v
14v
15v

z
z

.05
.08
.15
.05
.25
.25
.25
.25
.25
.25
.25

8-pin
14-pin
16-pin
18-pin
22-pin
24-pin
28-pin
40-pin

pcb
pcb
pcb
pcb
pcb
pcb
pcb
pcb

4002
4004
4006

7401

7402
7403
7404
7405
7406
7407
7408
7409
7410

3.95
1.20
.35

4007

4008
4009
4010
4011

4012
4013
4014
4015
4016
4017
4018
4019
4020
4021

4022
4023
4024
4025
4026
4027
4028
4030
4033
4034
4035
4040
4041

4042
4043
4044
4046
4049
4050
4066
4069
4071
4081

4082

.95
.30
.45
.20
.20
.40
1.10
.95
.35

7411

7412
7413
7414
7416
7417
7420
7426
7427
7430
7432
7437
7438
7440

1.10
1.10
.60
.85
1.35
.95
.25
.75
.35
1.95
.50
.95
.35
1.50

7441
7442
7443
7444

2.45

7445
7446
7447
7448
7450

1.25
1.35
.69
.95
.95
.95
1.75
.70
.50
.95
.40
.35
.70
.45

7451

7453
7454
7460
7470
7472

9309
9322
95H03
9601

9602

.75
1.25
1.10
1.45
1.25
.45

100 -pry

1.20

25 Amp Bridge

200 -pry

1.95

7473
7474
7475
7476
7480
7481
7483
7485
7486
7489
7490
7491

7492
7493
7494
7495
7496
74100
74107
74121
74122
74123
74125
74126
74132
74141
74150
74151
74153
74154
74156
74157
74161
74163
74164
74165
74166
74175

.25
.35
.35
.30
.55
.75
.95
.95
.30
1.35
.55
.95
.95
.40
1.25
.60
.80
1.85
.35
.35
.55
.55
.45
.35
1.35
1.00
.85
.75
.95

1.05
.95
.65
.85

.95
.60
1.50
1.35
.80

74176
74180
74181
74182

74190
74191

74192
74193
74194
74195
74196
74197
74198
74221
74367

1.25
.85
2.25
.95
1.75
1.35
1.65
.85
1.25
.95
1.25
1.25
2.35
1.00
.85

XAN72

7 seg

FND 359

Red 7 seg corn- cathode

74H72
74H101

74H103
14H 106

.35

74 L03
74 L04

.30
.35
.35
.35
.45
1.95

74L51

74L55
74 L72

75108A
75110
75491
75492

74H00
74H01

74H04
74H05
74H08
74H10
74H11

74H15
14H20
74H21

74H22
74H30
74H40
74H50
74H51

74H52
74 H 53J

74H55

.35
.35
.50
.50
.25
.25
.25
.25
.35
.35
.25
.30
.30
.25
.40
.25
.25
.25
.25
.15
.25
.25

.55
.75
.75
.95

74L00
74L02
74L10
74L20
74 L30
74L47

74L73
74L74
74L75
74L93
74L123
74500
74S02
74503
74504
74505
74508
74S10
74511

74520
74540
74S50
74S51

74564
74S74
74S112
745114

corn-anode

.35

.45
.65
.45
.40
.45
.55
.55
.55
.55
.55
.30
.35
.35
.35
.35
.35
.35
.25
.25
.45
.25
.40
.90
1.30

.85
.35
.85
.55
.75
.50

.35
8266
MCT2
.95
3.95
8038
.75
LM201
.25
LM301
.75
LM308
.65
LM309H
LM309K (340K-51 .85
1.15
LM310
.75
LM311D (Mini)
.65
LM318 (mini)

LM320K5 (79051
LM320K12
LM320T5
LM320T12
LM320T15
LM339
7805 1340r51
LM 340T 12

LM340T15
LM 340718

1.65
1.65
1.65
1.65
1.65
.95
.95
1.00
1.00
1.00

LM340T24
LM340K 12
LM340K 15
LM340K18
LM340K24
LM373
LM380
LM709 18,14 PINI
LM71

.95
2.15
1.25
1.25
.95
2.95
.95
.25
.45

MEMORY CLOCKS
745188 (8223)
1702A
MM5314
MM5316
2102 -1
2102L -1
TR 1602B/
TMS 6011
8080AD
8T13
8723
8T24
2107B -4

1.50
1.25

.45
.75
.35
.35
.80
74S157
.35
74S158
1.05
745194
(81231
.25
74S257

745133
745140
745151
74S153

74 L500
74 LS01

74 LS02
74 LSO4
74 LS05
74 LS08

74LS09
74 LS10
74 LS 1
74 LS20
74 LS21
1

74LS22
74LS32
74
74
74
74
74

LS37
LS40
LS42
LS51

LS74
74 LS86
74 LS90
74 LS93

74LS107
74 LS 123

74[S 151
14[S1 53
74 LS1 57
74 LS 164
74 LS367
74 LS368

.35
.35
.35
.35
.45
.35
.35
.35
.35
.35
.25
.25
.40
.35
.45
1.10
.50
.65
.65
.95
.95
.85
1.00
.95
1.20
.85
1.90
.85
.85

LINEARS, REGULATORS, etc.

9000 SERIES
9301

.15
.15
.20
.20
.15
.25
.35
.55
.25
.15
.10
.25
.30
.45
1.10
.25
.40
.15
.30
.45
.15
.30
.35
.35
.25
1.15
.45
.85
.45
.65
.95
.95
.70
.25
.25
.20
.25
.40
.45
.40

NPN
(Plastic .10) .15
.15
PNP
.10
PNP
.35
NPN
.50
60v
NPN
15A
.35
PNP
Darlington
.15
LED Green, Red, Clear
7 seg 5/8" high corn-anode 1.95
D.L.747

2N2222
2N2907
2N3906
2N3054
2N3055
T1P125

.45
.40
.40

To -3 Sockets

7400

.15
.20
.20

4001

ww
ww
ww
ww
ww
ww
ww
ww

.25
.25
.25
.25
.45
.35
.35
.50

Molex pins .01

2 Amp Bridge

MOS

4000

TRANSISTORS, LEDS, etc.

SOCKETS/BRIDGES

DIODES/ZENERS
1N914
1N4005
1N4007
1N4148
1N753A

3.00
6.95
3.00
3.50
1.75
1.95
6.95
15.00
1.50
1.50
2.00

4.95

INTEGRATED CIRCUITS UNLIMITED

7889 Clairemont Mesa Boulevard, San Diego, California 92111
(714) 278 -4394 (Calif. Res.)
No minimum
All orders shipped prepaid
COD orders accepted
Open accounts invited
California Residents add 6% Sales Tax
Discounts available at OEM Quantities
All IC's Prime /Guaranteed. All orders shipped same day received.
MasterCharge / BankAmericard / AE
24 Hour Toll Free Phone 1. 800-854 -2211

CIRCLE 75 ON FREE INFORMATION CARD

www.americanradiohistory.com

LM723
LM725
LM739

.50
1.75
1.50
LM741 (8-141.25
1.10
LM747
1.25
LM1307
.95
LM1458
.50
LM3900
.65
LM75451
NE555
.50
N E 556
.95
NE565
.95
1.75
NE566
1.35
NE567

SPECIAL
DISCOUNTS

Deduct
Total Order
5%
$35 - $99
10%
$100 - $300
$301 - $1000 15%
20%
$1000 - Up

NAME brand digital /analog test equipment. Discount prices. Free catalog. SALEN ELECTRONICS, P.O. Box 82, Skokie, IL 60076

GOLDMINE of parts, powerful power supply,

documentation, in complete Cartrivision electronic assembly. Perfect for microprocessor and
all electronic applications. $24.95 total. Master
Charge, BankAmericard. Free brochure. MADISON ELECTRONICS, INCORPORATED, 369,
Madison, AL 35758. Satisfaction guaranteed.

RECONDITIONED test equipment. $0.50 for catalog. WALTER'S TEST EQUIPMENT, 2697 Nickel, San Pablo, CA 94806

MANUALS for Govt. surplus radios, test sets,

scopes. List 50 (coin). BOOKS, 7218 Roanne

Drive, Washington, D.C. 20021

Burglar -Smoke
Fire Alarm Catalog

cM

PRINTED circuit supplies. A process that always

works. Send stamp. CIRCOLEX, Box 198, Marcy,
NY 13403

FREE

THE DC 12 CLOCK MODULE ADDS A DIGITAL TIME

DISPLAY TO YOUR
TV SCREEN
AS FEATURED IN JULY RADIO ELECTRONICS,
PROGRAMMING OPTIONS INCLUDE
HORIZONTAL & VERTICAL
LOCATIONS OF THE DISPLAY
DISPLAY FREQUENCY (1 TO 10 MINI
DISPLAY FORMAT (12 OR 24 HOURS)
SECONDS DISPLAY OA SUP.
PRESSION DURATION OF DISPLAY AUXI(IART INPUT FOR
TEMP-

***

KIND OF RECORD CLUB

Discounts up to 73 %, no "agree -to- purchase" obligations.

All labels, Schwann catalog of thousands of titles; classical,
pop, au, country, etc. Discount dividend certificates. News-

$36.95

COMPLETE KIT WITH INSTRUCTIONS

SHIPPING
NG O
INCLUDING CIRCUIT BOARD. TRANSFORMER AND 50 COMPONENTS
FOR INFORMATION ON OTHER CLOCKS AND
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.4

TO

letter; accessories; quick service. 100% iron -clad

guarantees. Write for free details.

4p

DISCOUNT MUSIC CLUB, INC.

DEPT.
650 Main Street. New Rochelle. N.Y. 10801

Billions of dollars lost annually due

to lack of protective warning alarms.

QQ

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FREE

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Shows you how to

protect your home, business
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Wholesale
prices. Do- it- yourself. Free
engineering service.

_J

ELECTRONIC components, communication and

test equipment. Stamp for catalog. E. FRENCH,
Box 249, Aurora, IL 60507

3-0178

Box 82802

Seeking Original Japanese Replacement

Parts

for CB and Stereo Repair

WANTED

Use?

2SA 798
2SA 814

.59
1.10
.59
.59
.59
.90
.70
2.00
.90
3.00
2.50

2.00
1.60

.70
1.10
1.60

.70
2.50
2.25
.70
59

59
.59
1.70
3.40
1.90
1.10
3.60
59
.90
.59
.70
.59
4.90
.70
.70
.70
.70
.70
.70
.70
.70
1.60
1.40
.70
.70
.70
59
59
.59
2.65
3.70
4.40
5.80
59
3.40
5.80
.59
1.10
.70
1.90

2SA 818
2SA 878
2SA 839
2SA 841
2SA 847
2SA 850
2SA 872A
2SA 908
2SB 54
2SB 55
2SB 75
2SB 77
2SB 186
2SB 187
2SB 202
2SB 220
2SB 303
2SB 324
2SB 337
2SB 367
258 368B
2SB 379
2SB 400
2513 405
2SB 407
2SB 415
2SB 434
2SB 440
2SB 463
2SB 471
2SB 472
2SB 474
2SB 492
2SB 507
2SB 509
2SB 514
2SB 5260
2SB 527
2SB 528D
258 536
2SB 539
2S8 541
258 554

.70
1.40
2.15
.59
.59
.70
.59
11.00
.59
1.10
.59
.59
.59

403
430
454
458
460
461
481
482
485
486
495
25C 497
2SC 509
2SC 517

1.60
.70

2SC 535
2SC 536

.59

.59
70
1.60
1.50

2.15
1.10
59
70
1.40
70

120
70
1.50
1.60
2.80
1.20
1.00
1.60

1.90
1.90
1.30

1.90

160
1.60
4.90
4.40

1000

2SO 5618

.70

258 564

.90

2SB 595
2SB 600A
2SC 183

1.90

7.00

2SC 184
2SC 281

.59
.59
.59

2SC 284
2SC 367
2SC 369
2SC 371
2SC 372
2SC 373
2SC 374
2SC 380
2SC 361
2SC 382
2SC 387
2SC 394

1.40
.90
.70
.59
.59
.59
.59
.59
.59
.59
59
.59

2SC
2SC
2SC
2SC
2SC
2SC
2SC
2SC
2SC
2SC
2SC

2SC
2SC
2SC
2SC
2SC

537
538A
562
563
619

2SC
2SC
2SC
2SC
2SC
2SC
2SC
2SC
2SC
2SC
2SC
2SC
2SC
2SC

620

632A
644
645
650
688
880
684
6938

696
708A
710
711
712
2SC 717
2SC 730
2SC 732
2SC 733
2SC 734
2SC 735
25C 738
2SC 756
2SC 763
2SC 773
2SC 774
2SC 778
2SC 778
2SC 781
2SC 783R
2SC 784
2SC 785
2SC 789
2SC 793
2SC 799
2SC 815
2SC 828
2SC 829
2SC 838
2SC 839
2SC 870
2SC 871

.59
1,10
.59
.59
59
.59
1.60
1.50
1.60
1.60
1.00

1.60
.90
3.95
.70
59

.59
70

2.15
1.10
.59
.59
.70
.59
.70
1.30
.59

2.80
1.40
.59
1.95
1.90
.59
.59
.59
.59
4.40
.59
.59
.59
.59

.59
2.80
.59
.70

160
2.65
3.60
2.65
3.80
.59
.70

1.00
2.80
3.80
.59
.59
59
.59
.59
.59
.59

2SC
2SC
2SC
2SC
2SC
2SC
2SC
2SC
2SC
2SC
2SC
2SC
2SC
2SC

897

2SC
2SC
2SC
2SC
2SC
2SC

1030c
1047
1060

2.80

1061

1.40

2.85
4.40
.59

898
900
929
930
943
945
959
971
983
984

10008L
1014

1017
2SC 1018

1080
1096
2SC 1111
2SC 1115
2SC 1116
2SC 1116A
2SC 1124
2SC 1182
2SC 1166
2SC 1173
2SC 1175
2SC 1177
2SC 1189
2SC 1211D
2SC 1213
2SC 1222
2SC 1226
2SC 1237
2SC 1239
2SC 1279
2SC 1306
2SC 1307
2SC 1312
2SC 1313G
2SC 1317
2SC 1318
2SC 1327
2SC 1330
2SC 1342
2SC 1344
2SC 1345D
2SC 1359
2SC 1380
2SC 1362
2SC 1364
2SC 1377
2SC 1383
2SC 1400
2SC 1402
2SC 1403
25C 1419
2SC 1444
2SC 1448

PRICES MAY CHANGE WITHOUT NOTICE

IMMEDIATE DELIVERY WITHIN 48 HOURS

ON ALL TRANSISTORS IN STOCK
Minimum order $5.00 Ohio residents add 4% sales tax.
Add $7.00 postage and handling. Quantity discount prices.
ASK FOR OUR COMPLETE PRICE LIST
MANUFACTURER INQUIRIES WELCOMED

All Parts Guaranteed Against Factory Defects

.59
.59
1.20
.59
1.50
1.00
1.00
.90
.59
1.20
1.40

120
.70

2.25
4.40
1.00

3.40
3.40
4.40
4.90
1.30
1.10
.59
.90
.90
14.00
1.40
.70
.70
.45
1.00
4.25
3.50
.70
4.40
4.90
.59
.59
.59
59
.59
1.50
.59
.59
.59
1.40
1.00
.59
1.40
4.90
.59
.59
3.70
3.70
1.10
2.80
1.10

25C 1449

1.00

2SC 1451
2SC 1475
2SC 14785
2SC 1509
2SC 1584
2SC 1586
2SC 1624
2SC 1826
2SC 1628
2SC 1647
2SC 1689
2SC 1674
2SC 1675
2SC 1678
2SC 1682
2SC 1884
2SC 1708
2SC 1728
2SC 1730
2SC 1760
2SC 1775
2SC 1818
2SC 1885
2SC 1908
2SC 1909
2SC 1951
2SC 1957
2SC 1969
2SC 1973
2SC 1975
2SC 2028
2SC 2029
2SC 2091
2SC 2092
2SC 2098
2SD 28
2SD 75
2SD 90
2SD 91
2SD 92
2SD 118
2SD 130
2SD 142
2SD 143
2SD 178
2SD 180
2SD 187
2SD 188
2SD 205
2SD 217
2SD 223
2S0 224
2SD 227
2SD 234
2SD 235
2SD 287
2SD 313
2SD 315
2SD 325
2SD 3560
2SD 357D

1.80

1.40
.70
1.10

8.50
6.60
1.30
1.10
1.30
.59
1.60
.59
.59

2.25
.45
.59
59
2.00
.59

2.00
45
4.25
.70
.59
4.40
1.10
1.20

4.90
1.10

4.40
90

3.90
3.60
3.90
3.90
2.80
1.10
1.60
1.60
1.50

3.00
1.20

2.00
2.80
1.40

Maybe it

1.30
1.20
1.40

AmericanCancerSecl4y !

3.40
8.50
2.80

We..an, m.ureca,Ker in your L&un,

1.60
1.10

6.60
1.90

25K 19

1.60
90
1.10
1.10
.70
1.30
1.30
1.30

2SK 30

2SK 33
2SK 34
2SK 40
2SK 49
23K 55

2SK 68
3SK 22
3SK 35
3SK 39
3SK 40
3SK 41
3SK 45
MK 10

2.55
2.25
2.25
2.25
2.50
2.50
2.00
IC

AN 2140
AN 315
BA 511
BA 521
HA 1151
LA 4400
TA 7045M
SN 7400
SN 7490
TA 7055P
TA 7060P
TA 7061AP
TA 7062
TA 7205P
TA 7310P
UPC 592112
PLL 02A

3.40
3.70
3.40
3.70
3.70
3.70
3.00
.19
.60
3.00
1.60
1.90
1.90

3.90
3.95
1.60

8.80

DIODES
1S 84

1S 188

1.40

15 332

1.90
1.90
.59
1.00
1.00
3.70
1.10
1.20
1.10
1.10
1.00

99

FET

3.00
4.40

go

The five must dangerous lords in the English language.

2SD 358
2SD 380
2SD 382
2SD 388
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250 427
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25A 509
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15 1209
10 1211

15 1555
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13 2473
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FUJI -SVEA ENTERPRISE

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(513)874-0220
874 -0223

SEE IN THE DARK

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SPL -21 $199.00
IR

CHARACTER GENERATOR CHIP

Memory is 512X5 produces 84 five by seven
ASCH characters. New by National, w /specs
$6.00
TOUCHTONE ENCODER CHIP
Compatible w /Bell system. Ideal for repeater
work. W /specs
$6.00
SMOKE FIRE -INTRUDER ALARM
12 VDC w/5 inch loud bell, w /instructions.
Fine biz. for car, camper. boat, home
W /instructions
$20.00
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customer paye all postage

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VALMONT ROAD
BOULDER, COLORADO 80301
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rGIAfT CATALOG

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The best bargain on this

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Common anode.
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High quality, ultra -sen

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PAREL LAMP
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41127 OPTO IIOLATOR

panel lamp.
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inside with

PRICE

PART NO.

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NPN

470 ohm, vertical

31.00

New

^y.e._

amps,

504

Cond. Part No. 1'

RIB -006
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12 RIB-012
24 R18-024

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65

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Made
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PAT -018

5 MEG

1J

90

POT/

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P.C. TRAR/FORMER

PHOTOFLAJH CAP

Super high quality.

Brand new Rubycon.

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PFC360 $

Input 117VAC, outputs: 5.5V

-10.5V

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250ma or
@

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With specifications.
PCX-120

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(T
t,

$4.95

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65

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/50V CAP

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.1 uf at 50 VDC.
DCP -150

154
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mina) strip.

te

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STS-010

for

Long shaft for

deep panel

mounting. 3A
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mount, 2 pole
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t
very good

BRRRIER BLOK
o llIlellelIlell o
Black

ndition.

molded

bakelite
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barrier block,

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2554

Huf mini CAP 47pf mini CAP

Ultra- miniature
.01
of
ceramic chip capacitor,
axial
lead.
Appx.
'''h"
long. High quality.
DCP-015

154

Ultra-miniature cercapacitor for

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amic

UMC-047

MST-111

104

5000mf

60VDC
30V DC

CGC -503

2700mf

25VDC

CGC -272

50

5uf, I50V
uf, 150VDC cap.
Great for audio
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Non -polarized.
NPC- 515
5

604

3.95

125 VAC.

High quality dual concentric pot.

1/8 and 1/4 inch shafts. New by Allen
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pot is 25K linear, rear pot is 50K log.
MV R -255

250
1.95
1.75

$1.75

DIJO
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of disc ceramic

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peel -off strips of

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AUT -127

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Quality computer grade caps.

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65 4

104

MOD-POT

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mini -!WITCH
K. Very high quality

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for only

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PTN -140
your choice,
25 for
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closed diaphram activates with

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VPS-195

50'

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SSW-221

New by Allen
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mini 1/8" shaft,

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DC MOTOR

2 sizes:

VACUUM !WITCH

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Black molded bezel or di g'tal displays. Snaps into square hole. 2 %"
long by 7/8" high. Adds a professional touch !!! NBZ -001

disc ceramic
capacitor. We have

w231 254-

TERMIRAL

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RELAY/

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Round: )RRF -120) 12 for 75s

Square: (SRF -120) 12 for 55

CGC-596

JWITCH
AIDE
Standard DPDT

34.00

Molded, adhesive back

rubber feet in peel -off
sheets from 3M.

Unique solder-thru
insulation. Buy by
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(Appx. 500 feet).
LBW -220
$3.95

CGC -122

.02

OCKER JW.
:

954

22 ga. magnet wire.

75$

to

TSW -111

50

RUBBER FEET

10

PCT -130

peices, assorted sizes.

$1.45

WIRE JPECIAL

1.5V

CAP

Mini trim cap. Great

for crystal circuits,
hand probes, etc. Measures 3/16" diameter.

HST -120

(6 a

DIXC
BELL7 .O2uf
of

closed, alumi'ed signal bell.

(VAC or 3 -6V
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mini 1/8" shaft,

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L.E.A.

Jumbo red LED for

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.200" diameter. $
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"HIE

New Allen Bradley

Potter & Brumfeild 120V.

SPOT, 25 Amp.
CRY-012

rr

1.95

*1.50
Most popular clock chip
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MM5314. 12/24 hour, 50
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MME -314

POWER

Heavy duty, SPST

high quality. Rated
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RUMERIC BEZEL

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TOGGLE JWITCH

TDB -254

shaft

9.95

2n 3055

12-6"

7.95

3pf TRIM

tape.!

$150

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High voltage pots w/ insulated

for protection against
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1/8" shaft-,Small (QV R.505) $1.45
1/4" shaft-,Large (TV R-505) $1.75

O4O

LARGE ILCS -2001

than electrical
Slip over solder
joint & heat. Tube
will shrink to form tight seal.

The newest edition of the TTL data book for design engineers. Detailed
specs on over 900 TTL devices including standard and high -technology
Schottky Clamped TTL. Pin assignment drawings of all TTL types. The
most complete book ever written on TTL. -By Texas Instruments.

125VAC

75

LSW 100

SMALL (LCS -100)

Mini transformers
for clocks, etc.Out
puts 8V @ 500ma
or 12V @ 190ma
With specs.
CMX -812

AXC-160

70*

Small: 4 %L x 3%0 x 1%H.

Large: 6L x 4 %D x 2H.

29
HEAT JHRIfK
TRARIFORMER
Much easier to use

BNC -055

for ex

WIERD JWITCH

SPDT momen-

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assembly.lncludes dropping resistor
& mtng clip
NEL -110

The king of audio power transistors now at an unbelevable

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TTL DATA

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New by Sprague. Great

RI55011 CABLE

Mini SPDT
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'.

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.25
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PC.

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$1.95

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lnAP JWITCH
I.

by

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and completely assembled.

SCR output. W/ schematic.
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$t.50

,'

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LOOK MIRI -POT

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;,_

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op. from 150 -300V
FFT -100 1.75

$14.50

V.O H.

1.50

CRY 012

/TROBE TUBE

The famous Motorola HEP170

universal replacement diode.
Rated 1000 PIV @ 2.5 Amps.
HEP -170
20 cents ea.
100 for only

2.5K ohm, vertical

5K ohm, vertical
10K ohm, vertical
22K ohm, horizontal
50K ohm, vertical
470K ohm, horizontal

Brand new 12VDC relay

by Cornell- Dubilier. Has
N.O. and N.C. contacts.
Measures app..
x 1/"

10 for

R0170 DIODE

PCV-471
PCV-102
PCV-252
PCV-502
PCV-103
PCV-223
PCV-503
PCV-473

1K ohm, vertical

"

instrument enclosure with a wide

variety of applications. Unique interior plexiglass rack assembly will hold up to 6 -1.5" by
4" PC boards. Great for packing a lot of components into a very small space. Adds a very
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tough that you can run over it without damaging it !!!! The Logi -Case comes with a reversible front filter allowing you to choose between transparent red or smoke grey. Now
available in two popular sizes:
Universal

I2V RELRY

phototrans
istor & PN infravolt 'I
red light emitting
diode. 1500 volt
isolation. 3ma coil
output current. Excellent Ire quency response to 300 khz.
Brand new Motorola 6 pin DIP wi th
full specs & data.

.295

MOT 115

__

-_---

'117VAC fan motor for

use in cooling insides of
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cooling
yourself off, etc. A fan.
tastic buy at this price

POT/

P.C. TRIMMER

applications where transistors or SCR's are not

quite suitable. May be
driven directly from TTL.
RRY -510
$1.50

LOGI-CAIE

FAR MOTOR

DIGITAL READOUT!

REED RELAY

feet per strip.

FFT -015

felt

15

254

'

strip

JTAAD -OFF
Insulated stand off
terminal,''/." dia.,
5/B" long. With /."
mounting screw.
SOT -210 10/$1.49
''

Brand new Clarostat, 1/4" shaft

standard pot.

capacitor. We have
thousands
!I!
Buy while they last
DCP -010

TVR-103

ComPOnEfT

COR ECTOR

CARRIER

Female UHF to
BNC male connector. Plated, new.
ADP -239

Molded plastic with

hole drilled in cenD

-$1.95

CLP-050

5`254

52OOuf CAP

1800uf CAP

8200u CAP

New 25
of at 25 VDC, PC
leads
PCL -522

1800 of at 40VDC.
Brand new.
PCL-184

8200 of at 15
Brand
by Mallory.new
lory.
AXC-821

s--p

754

TYPE

MKm

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204

Extremely stable mettalized

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polycarbonate.
of at 150 VDC.
.4" lead spacing. MKM -010
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60 RMP(I)
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over $11.00.
Mfg. by Curtiss.
PTS-060

$4.00

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TTL
7400

.13
.16

7401
7402

.15

710)

.ls

7404

.16
.19
.20

7405
740e
7407

.1e

7400

.18

7409
7410
7111
7411
7414
7416
7417
7410
7422
7423

19

.16
.25
.43
.65
.35

.75
.16

7451

71151
74154
73155

.17

.v

7451
7454
460
7464
7465
7470

17

.c

35

74114
74157

.97
.97
.99

3S

741;3

1.79

.10

1.23

7471

.w

74160
74141

Nn

.ls

N16t

t)9

7474
7475
7+74
7481

.28

74161
74164

748;

.M

7486
7489
7490

.40

1.09
.99
.99
1.25
=.10
1.49

49

.w

7416;

.68

74166
-4 i70

2s

7492
7491

7426
7427

.29
.27
.26
.29

.48

7494
7495

?4O

.xo

7431
7417

.23

.78
.79
.79
.98

.25

7196
74100
74105

.M

-418;
-418'

7401
7440
7741
7442
7441

25

74107

.17

-4190

.15

74111
741=1
74111

.38

74141

.38
.65
.54
.SB

'4192
'4191
-4194
7419,

.89
.54
.73
.71

1.23

74175
.75

7425

.97

74171
74174

7491

30

.89
1.20

.97
.89

74176
74171

40

.84

+I55

.90
2.45
.79
1.90
2.20
5.75
1.15
1.25
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74181

'4182
-+184

.85
1.25

.73

74115
74124
74111

.89

"4916

1.25

7446
7417
7440

AI

74141

1.04

-419-

.73

.79

1.71

7450

.17

74151

1.01
.97
.79

'4wx

J9

74115
74150

'4199
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1.69
5.45

7444
7445

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LOW PowuR
74100
74102

.29
.29
.23
.29

74L0)
74106

7414
74(10

.29
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.29
1.19

74120
71130

7414/

74151
74155
74171
74171

.29
.29
.19
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-41%

7,(71

.w

-4194

74174

.56

-41164

74(84

75

74135
74146

1.09
.65

1.40
1.20
1.50
1.50
1,15

74191

7,041

4195

its

zlo

11(165

LOW POWER SCHOTTKY

741.900

.16

74L502
74LSO4

-41 503

18

4510
741520

)b

74151/
74(540
'41542

-4119;

tog

1.40

'415107
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120

18

.45

.59

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415191

1910

16

741574
41590

1.10

11519'

10

16

741591

1.10

HIGHSPEED
744400

74H01
74H04

.25
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4411

25
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'14461
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714403

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74H11

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'444 0
74H40
44450
74H51
74H51

74H20

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741455

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74H74
144101
74H102
74H101
74H 106

74H11

.25

714460

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7044108

,25

LINEAR CIRCUITS
LM300H
$.71
LM301CN
.29
LM302H
.65
LM304H
.80
LM307CN
26
LM307H
.30
LM308H
.89
LM309H
1.05
LM309K
.99
LM310CN
1.07
LM311CN
.89
LM311 H
.89
LM311N
.89
LM319N
1.13
LM320K
5, 5.2, 12, 15 1.29

LM322N
LM324N
(LM2902N)
LM339N
LM340K
75, 18, 24

1.29

LM340T
5, 6, 8, 12,

15, 18, 24
Equiv.) 1.19

(78--

LM372N
LM376CN
LM38ON
LM380-8CN
LM381N
LM382N
LM385K
NE531V
NE540L
NE546A
NE550A
LM555CN
NE556A
LM560N

.2.93
.59
1.29
.95
1.75
1.75
.45

2.90
2.90
1.09
.75
.39
.85

2.95

.16

1.. 117x.4 FOLK

.58
.54
.60

"..

4111069

1.15
.26

15
25

1.52

.57
.54
.29

115

40-14i

.26

40114
4024A
40254

.15
.89
.15

40-14
40' 10

.15
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40-5*

4063*

.869,

402'A

59

40-80

4020

.98

40104

.44
1.27

40820
45184

1.%

40I14

.25
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458A

1.54

40144
4015A

1.27
1.27

40404
40420
40494

1.19

1S85

110

4050*

49

.M
1.01

4015*

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1.47

Iif

8211

10{71

50V

112014

5040

IRllul 10V

504

22N 5nv
2714 50V
3301 90V

22011 515.5
27001 10V

02211 90V
030u 50V

50V

190,I 505

050411

470p150V
9nnpf sm

0n151

56p 50V
98p 50V

QTY.

505

PRICE

(each)

0047 of 50V
0101 50V
01411 1111111'4

50V

PRICE

(Minimum

10

per value)
0-10
10-100
100-

114

$.10 ea
$.10 ea

.85

5.05 ea
1.04 ea

,nnV,D.DA,.D.VDA.,,o,

"..,

$1.29
AY51013A

DART

F^" ^` '.9P"uD

Pius 9O0 handling

1702A

$6.95

BIT RAM
TRI-STATE

256

74S200

oM1Dge.

$3.25

LD110, LD111

K ERAS PROM

$4.75

3' :DIGIT A/D CONVERTER SET

$24.75

_
6 Digit.

Clock Kit

MINIATURE SOLID STATE

ELECTRONIC BUZZER

r..,.y)

``'xs^'
\

-'

M)7,G,

14.5^.'

2..2,,.(..7. A

MM5314 with 6 NS71 .27" displays 2 P.C.

Display board may be remote.
boards
Internal or wall transformer can be used.
50-60 Hz, 12 -24 hour. Includes all necessary
transistors, resistors, capacitors, diodes, 3
switches and complete assembly insiruc-

13D11.

CK6 -3

514.95

l6 SOCKETS
Sold., Toll - low protllo
pin
11 Pi"

5.17

20
,22

lb pin
18 pin

IU\(,

14

pin

2e

0374

40

pin

If

IUV ((RKf

ZTS ..

min AT

EB -106

6V
121

FB -112

\i

FT.

15mA

LA

4 -9

VDC $1.99
8 -20 VDC 1.99

ImA

1.4

RN60 TEMP COEF

50

1010

ALL

STANDARD DECADE VALVES FROM

062

.69

OHM TO 464K OHM

n
/RIO

10.5

'69

PRICf

MINIMUM

EACH

PERIV4ALUE40
5.10
.10

10

,,

10

100

100

1000

11.19

1000

,'

90 1191`1.
P1. 1 P..I.r1 Pr9
11.9."

.l0

$.09

.10

.OB

CARBON FILM RESISTORS

Solo

j4W
ALL STANDARD VALUES FROM
additional
56 OHMS TO 5.6M OHMS
',"imodi ' 16 p" ICS "n`
vn.DdM .x6 061.7.
6d.. c
alter, on
ALL STANDARD VALUES FROM
plat Mmbn
pp., ,9. inn. 15, 116 ".69 16' Si AO
I OHM TO 15M OHMS
PRICE
PRICE
EACH
QTY.
2502 11124 hii MUl T DYN 15 pin
lea( hi
52.4
(Minimum 10
2.4
2 ,U4 )(124 hit MUt i DYN H pm
per value)
I111 ID.Slale Dual 10.100.2011 hit
0 -10
s,10 ea
AND

IC

SNIPPING 51.44

is

450 Hz

METAL FILM RESISTORS

.2q

AM/

s,

III

1i1(, RI11ARII
DRAIN

\im I\(; (() \I A(

\O
78 dB

CRA

I.411

IMN
.20

SHIFT REGISTERS

.1

(IFAR DOME

1-0"

25

MVSO
18V50

(11AR
00101
RIO - 41141

0',

.12
.12

741t00

RIO

R200
ALT-T1 07

RL) DILL. SUBMINIATURI

0'

19

l1124"
NO 4474G1
114"

I1"

'12
.12

lURf

.15

RED DIFF. CURRENT REG. 190"

CONS) SRIGHT NF55 4.5.1/ so

.25

Dllf CURRENT MC
cONSI. BRIGHTNESS 4.5- ,
RFD DIR 1l1 HOOD 9p

.25
.15

GREEN

SPOT

190"

,tB

CLEAR

POINT

190-

.15

RED

LED s

STATIC 14 Din
318 He 12 -hit STATIC 16 pin
2119 He. 40 -hit STATIC 16 pin
2527 Dual 256 bit STATIC 8 pin
1012 Quad 80 hit
pm
DC
101 { 1024 hit accum. Dynamic A pm
P
11th (KI/ 512 hit Dynamic A pin
pi
1

MMl305

2.43
2.91
2.4
2.93
1.7;
1973

1.19

10-100
188-1000

Divider mDIP

2.49

j.75
5.95

Date sheets on request.

Add 304 each
q
it item is priced below 51.00 each.

la

5.9$ ea
$.04 ea

M CAPACITORS
Solid dipped +20%

mid
mid
mid
1.2 mid
1.3 mid
1.3 mid
4.7 mid
6.8 mid
6.8 mid
.1

13

Crystal 3.58 MHZ coin, TV

(_145141 2.010 MHZ

5.19

NV
155

205

15
.25
.25
.25

15V

10

355

.10
.10
.10
40

165

65
505

10
10

n,Id
mid

mid
IS mfd
12 mid
)3 mid
47 mid
e mid
ISO mid
15

165

255
105

200
16V

105
55

65

I5

.40
.45
.40
.45
.45
.40
.45
.45
.50

FREE CATALOG AVAILABLE ON REQUEST

RID CA .27" IHD

RID CA .70' RHD
RID C A .50 RHO
RID CC .1-5" RHO
RID ( C .10" 1111)
FISH 74R RID CC .10" R111)
RED CC .;0 KHD
DL 500
MANS
GR[FV CA '7" 144
YMCAS CA .27" HID
MANE
MAN82 Y[LEO% CA .3" l44
MAN66 RED C A .6" (HD
RID CA .6 4/1D
0L747

DL 10A
DL 707
DL 507
FND 359
DL 702

2I2

n..r.9..,,0.

$9.700

MV1oa

RL -4403

10014 50V
120p1 50V
1504 505
111107

.71

170'

RLC201

500N I K RAM

ASSEMBLED AND TESTED

'

.35
.35

INIRARFD (114R 1/0)A1

$95

,., ".ro 419 u.c.."n9"

""`" n

.35
.35

DISCRETE LED's
ME4

RLC -200

CERAMIC DISC

)pf

AII.D1

r,..D=".n
w

.59

CAPACITORS
50V
Spf 50V
7pf 50V

.".5, 9

1111, WITH VALID D,,,

r,.,.,DrD..,, :1.Dr,n,..,r "rWm.DD,

MOM. 71.011OACAM

.39

.19
.19

40174

111

91.9 11,11. 10

.72

40(94*

LAO "IPAU11..

nor..r.,.DDPmnA.in r,r "wg,

INDOMAYSIOMOMOOOVROLIOVOIOMODOI

4.59

, ,,,m

,.. ,rum

72

119
1.7/
113
.94

CHARACTER GEN

79

4/r..

`'

99.99

",V"A..A,".D " ""' " "' "`"""'n"

2.80
1.59
1,29
.59
.89
2.48
.89
.89
1.19
1.49
.49
.79

a 1nsA1,., n

n.9A,1D ",

CLOCK CHIP

256

" "" ."I

"

'

WITH TI TMS 1000

MICROPROCESSOR CHIP
PROGRAMMED TO PLAY
24 DIFFERENT TUNES

',r.Aw....

-f

%- ;v

514EOM

ELECTRONIC DOOR CHIME KIT

.A

4018*
4010*
4011,
4021*

.....'9

FULL SPEED

2700
2708
.95
DIGIT
5314
52.95
C
82S23
2513
6405ASCII
6

39

LM1414N
LM1456CN
LM1458CN
LM1496N
LM 1800N
ULN2208
ULN2209
C3046
CA3081
LM3900N
LM7524
LM7525
80388
75451CN
75452CN
75453CN
75454CN
75491N
75492N

$39.50

4000*
4001*
4001,

1.19
1.29
1.49
.59

LM131 ON

CMG[

40I6A

1.52
1.58

5, 6, 8, 12,

40074
40004
4009A
4010A
40114
4011A

1.19
1.59

5, 12, 15

1.39I

.25
.29
.59
.39
.55
.52
.79
.99
LM739N
LM741CN(8) .32
)
LM741CN(14) .32
35
LM741CH
.79
LM747H
.71
LM747N
.35
LM748CN

LM3207

Stand Alone
ASCII Keyboard

2.95
1.19
1.39

LM561N
LM565N
LM565H
LM566H
LM566CN
LM567CN
LM567H
LM703H
LM703CN
LM709N
LM709H
LM710N
LM711N
LM723H
LM723N
LM733H

1.89
1.49
1.49
.89
1.39
1.49
1.49
1.39
1.39
1.39
2.19
2.39

lion guaranteed. Shipment will be made postage prepaid within 3 days Iran
receipt o1 order. Payment max be made with personal cIlec4. rharge lard (include
number and exp. dale). or money order. Phone Orders- BolA and M/C card or C.O.D
Satislac

Add 51.00 to (over shipping and handling it order is less than 510.00.
California residents add sales tax. Inrlude shipping expense for orders shipped out of
U.S. and C anada approx. 10 ".. of order.

INTERNATIONAL ELECTRONICS UNLIMITED

me&

CIRCLE 66 ON FREE INFORMATION CARD

www.americanradiohistory.com

VILLAGE SQUARE, P.O. BOX 449

CARMEL VALLEY, CA 93924 USA
PHONE (408) 659 -3171

SAVE UP TO 50%

ON PARTS.

Hobbyist or professional, there

are probably a lot of circuits you
build just for the fun of it. And a lot
you'd like to build, but never get

around to.
One reason is the cost of parts.
Parts you buy for one project, but
can't re-use... because you haven't
time to take them carefully apart.
Or because of heat and mechanical
damage that occur when you do.
Now, there's an easier way that
can save you big money on parts
and hours on every project, as well:
Proto- Board" Solderless
Breadboards.
Now, assembling, testing and
modifying circuits is as easy as
pushing in -or pulling out -a lead.
IC's, LED's, transistors, resistors,
capacitors... virtually every kind of
component... connect and interconnect instantly via long -life, nickel silver contacts. No special patch

MODEL

NO. OF

14 -PIN DIP

SUGG.

OTHER

TIE-POINTS

CAPACITY

LIST

FEATURES

P6 -6

630

$15.95

Kit -10- minute

assembly

PB -100

760

10

19.95

Kit -with larger

capacity

PB -101

940

10

29.95

distribution

buses. higher
capacity

PB -102

1240

12

39.95

Large capacity,
moderate price

PB -103

2250

24

59.95

Even larger

cap acity. only

2.70 per tie -point
PB -104

3060

32

79.95

Largest capacity:
lowest price
per tie -point

PB -203

2250

24

80.00

Built -in 1 % -regulated 5Vpower

lA low ripple
supply
,

PB -203A

2250

24

129.95

As above plus
separate ' z -amp

+15V

and

-15V

internally adjustable regulated

outputs

'Manufacturer s suggested list

Prices and specifications subject to change without notice

cords or jumpers needed -just

lengths of ordinary #22 -30 AWG
solid hookup wire.
Circuits go together as quickly as
you can think them up. And parts
are re- usable, so as your "junk box"
builds. you build more and more
projects for less and less money.
Before you invest in your next
project, invest in a CSC breadboard.
See your dealer or order by phone:
203 -624 -3103 (East Coast) or 415421 -8872 (West Coast) -major
charge cards accepted. You've got
nothing to lose ...and a lotto gain.

=5C
CONTINENTAL SPECIALTIES CORPORATION

70 Fulton Terrace, Box 1942, New Haven, CT 06509

203- 624 -3103 TWX 710- 465 -1227
WEST COAST: 351 California St., San Francisco, CA 94104,
415- 421 -8872 TWX 910 -372 -7992
GREAT BRITAIN: CSC UK LTD.
Spur Road, North Feltham Trading Estate,
Feltham, Middlesex, England.
01- 890 -8782 Intl Telex: 851 -881.3669
MEXICO: ELPRO, S.A., Mexico City 5- 23 -30 -04
CANADA: Len Finkler Ltd.; Ontario

c 1977,

www.americanradiohistory.com

Continental Specialties
Corporation

NEW IMPROVED
AVANTI PDL IITM
CB BASE ANTENNA

16x more power to

you with a (CO INDUCTIVES)
design and an orbital

gamma match
because this system of
creating an impedance match is higher
in "Q" and lower loss than previous
matching devices and acts to increase
radiation.
Better reception with increased efficiency through use of orbital gamma
match.
Better rejection front -to -back separation
More Gain

is 32 db.

Burn -out proof. The PDL has no coils

or transformers to burn -out or detune.
D.C. ground construction offers better
lightning protection than any commercially available lightning protectors.
New cast
Compact construction.
aluminum rear hub. New fiberglass
filled high impact ABS front hub. New
swaged joints on orbital gamma match
plus cadmium plated parts and bolts,
stainless steel clamps, aircraft quality
heavy duty tubing for strong, low weight,
long lasting construction.
SPECIFICATIONS
Forward Gain

PDL II Model AV -122

12 db over standard

Polarity Isolation

reference isotropic
Full 40 Channels
32 db
23 db Vertical to Horizontal

VSWR

1.2:1

Band Width
Front -to -back ratio

Switch Box Included Low VSWR co -axial changeover to effect switching

horizontal to vertical.
50 -52 ohms
Impedance
Light or Medium duty rotor
Directional Beam
Lightning Protection D.C. Ground
Power Multiplication 16x
2.0 sq. ft.
Wind Load Area
Stacking kit available

high
performance

Ci

O- INDUCTIVE )TM
antennas

Avanti makes a complete line of high

performance mobile CB antennas and
accessories. For free catalog, write:
PHOTO COURTESY EDMUND SCIENTIFIC CO.

PLANETARY CONJUNCTION

creators of the
famous
Avanti Research and Development, Inc., 340 Stewart Avenue, Addison, IL 60101
,)Copyright 1977, All rights reserved

CIRCLE 57 ON FREE INFORMATION CARD

www.americanradiohistory.com