Total solder points: 47
Skill level :
Beginner 1o 2o 3þ 4o 5o Advanced
METAL DETECTOR K7102
Applications :
þ Avoid disasters when drilling holes in walls
þ Locate pipes, cables, metal studs, …
þ Great project for novices
þ Your own unique application
Specifications :
• Detection range adjustable up to 8cm/ 3.1”
• Push button operation
• Power supply : 9V battery
• Power consumption : 30mA max.
• LED indicator (Buzzer SV4/12AS optional)
• Dimensions : 55x64mm / 2.2”x2.5”
• Optional enclosure : G407
modifications reserved
ILLUSTRATED MANUAL H7102IP-ED1
5% 1% COLOR= 2… 5
4K7= ( 4 - 7 - 2 - B ) 4K7= ( 4 - 7 - 0 - 1 - 1 )
I P E SF S DK N D GB F NL
C CODICE CODIGO CODIGO VÄRI FÄRG FARVE FARGE FARB COLOUR CODIFI- KLEUR C
SCHEMA KODE KODE CODE CATION KODE
O COLORE DE DE COL- KOODI KODE O
DES
D CORES ORES COU- D
E LEURS E
0 Nero Preto Negro Musta Svart Sort Sort Schwarz Black Noir Zwart 0
1 Marrone Castanho Marrón Ruskea Brun Brun Brun Braun Brown Brun Bruin 1
2 Rosso Encarnado Rojo Punainen Röd Rød Rød Rot Red Rouge Rood 2
3 Aranciato Laranja Naranjado Oranssi Orange Orange Orange Orange Orange Orange Oranje 3
4 Giallo Amarelo Amarillo Keltainen Gul Gul Gul Gelb Yellow Jaune Geel 4
5 Verde Verde Verde Vihreä Grön Grøn Grønn Grün Green Vert Groen 5
6 Blu Azul Azul Sininen Blå Blå Blå Blau Blue Blue Blauw 6
7 Viola Violeta Morado Purppura Lila Violet Violet Violet Purple Violet Paars 7
8 Grigio Cinzento Gris Harmaa Grå Grå Grå Grau Grey Gris Grijs 8
9 Bianco Branco Blanco Valkoinen Vit Hvid Hvidt Weiss White Blanc Wit 9
A Argento Prateado Plata Hopea Silver Sølv Sølv Silber Silver Argent Zilver A
B Oro Dourado Oro Kulta Guld Guld Guldl Gold Gold Or Goud B
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1. Assembly (Skipping this can lead to troubles ! )
Ok, so we have your attention. These hints will help you to make this project suc-
cessful.
Read them carefully.
1.1 Make sure you have the right
tools:
• A good quality soldering iron (25-
40W) with a small tip.
• Wipe it often on a wet sponge or cloth, to keep it clean; then apply solder to the
tip, to give it a wet look. This is called ‘thinning’ and will protect the tip, and en-
ables you to make good connections. When solder rolls off the tip, it needs
cleaning.
• Thin raisin-core solder. Do not use
any flux or grease.
• A diagonal cutter to trim excess wires. To avoid injury
when cutting excess leads, hold the lead so they can-
not fly towards the eyes.
• Needle nose pliers, for bending leads, or to hold components in place.
• Small blade and phillips screwdrivers. A basic range is fine.
0.0
For some projects, a basic multi-meter is re- 00
quired, or might be handy
1.2 Assembly Hints :
þ Make sure the skill level matches your experience, to avoid disappointments.
þ Follow the instructions carefully. Read and understand the entire step before
you perform each operation.
þ Perform the assembly in the correct order as stated in this manual
þ Position all parts on the PCB (Printed Circuit Board) as shown on the drawings.
þ Values on the circuit diagram are subject to changes.
þ Values in this assembly guide are correct*
þ Use the check-boxes to mark your progress.
þ Please read the included information on safety and customer service
* Typographical inaccuracies excluded. Always look for possible last minute
manual updates, indicated as ‘NOTE’ on a separate leaflet.
3
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1.3 Soldering Hints :
Mount the component Make sure the solder Trim excess leads as
against the PCB surface joints are cone-shaped close as possible to the
and carefully solder the and shiny solder joint
leads
Assembly:
3. DIODE (Watch the polarity!)
1. WIND THE COILS ON THE
D...
ROD
CATHODE
q D1 : 1N4148
4. ZENER DIODE
q (Watch the polarity!)
ZD...
2. RESISTORS
R...
CATHODE
q ZD1: 3V9
q R1 : 330 (3 - 3 - 1 - B)
q R2 : 470 (4 - 7 - 1 - B)
q R3 : 470 (4 - 7 - 1 - B)
q R4 : 2K7 (2 - 7 - 2 - B)
q R5 : 10K (1 - 0 - 3 - B)
4
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5. CAPACITORS 7. LED (Watch the polarity !)
C...
LD...
CATHODE
q C1 : 1n2 (122) or 3n3 (332)*
q C2 : 47nF (473)
*Experiment for best result q LD1 : 5mm LED
6. TRANSISTORS 8. TRIM POTENTIOMETERS
R...
q RV1 : 2K2 (2K5)
q T1 : BC547 q RV2 : 100
q T2 : BC547
q T3 : BC547 9. PUSHBUTTON
q SW1 : 1P
5
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10. MOUNTING OF THE COIL AND THE BATTERY SNAP
BLACK
RED
11. ADJUSTMENT AND USE
Connect a 9V battery
Move away from any metal object
Turn pre-set RV1 fully clockwise
Turn RV2 fully anti-clockwise
Press and hold SW1
Turn RV1 anti-clockwise until the LED is about to light
All further sensitivity adjustments should now be done by turning RV2
To set maximum sensitivity, turn RV2 until the LED is weakly lit.
The brightness of the LED indicates the distance and the size of the metal
object.
An optional buzzer (SV4/12AS) can be mounted to give an audible indica-
tion.
12. DRILLPATTERN FOR OPTIONAL G407 ENCLOSURE
6
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13. PCB LAYOUT
14. DIAGRAM
1n2*
3n3
