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SY-1 Build Instructions: Erratas/preparations

The document provides build instructions for 3 circuit boards that make up a modular synthesizer system. It details errors on board 1 that need fixes, such as incorrect resistor values. It then lists all the components needed for each board, including quantities of resistors, capacitors, transistors, headers, and integrated circuits. It provides instructions to test board 1 once built and connect boards 2 and 3 together. The document concludes with steps for finishing the build by trimming settings like noise level and VCO frequencies.

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Pepe Coca
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334 views6 pages

SY-1 Build Instructions: Erratas/preparations

The document provides build instructions for 3 circuit boards that make up a modular synthesizer system. It details errors on board 1 that need fixes, such as incorrect resistor values. It then lists all the components needed for each board, including quantities of resistors, capacitors, transistors, headers, and integrated circuits. It provides instructions to test board 1 once built and connect boards 2 and 3 together. The document concludes with steps for finishing the build by trimming settings like noise level and VCO frequencies.

Uploaded by

Pepe Coca
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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SY-1 build instructions ​(Updated November 7th 2016)

Erratas/preparations
There are a few errors on the PCBs, let’s fix them first.

Board 1:
- In the noise section don’t install the 10k next to the noise trimmer. Install a jumper
instead. Use some wire from one of the big 220uF electrolytic capacitors, for instance.
- The rate slider for the LFO might kill the LFO when it’s at bottom. Increase the 470Ω
resistor next to it to something between 560Ω and 1k depending on your preference.
This might not affect all builds. Might be a good idea to experiment with this at the end of
the build. 680 Ohms seems to be a good value in my builds.
- Two 220k resistors must be connected to ground when trimming the VCO2s. Mount
these so that the leg in question is easily accessible for an alligator cable clip. Look for
the two white arrows on the PCB.
Board 2 & 3:
Four resistors are marked with the wrong value on the PCB – 100k and 47k instead of 22k! See
image for their location, it shows the values to install. Install these now.
Board 1:

RESISTORS
27x 100k
11x 10k
8x 220k (plus the two that are already mounted specially for the VCO trimming)
7x 33k
6x 100
5x 1k
1x 1Ω 2W
2x 470 (I used two 680 Ohms instead to avoid having the LFO stop)
2x 680
3x 2k2
4x 4k7
1x 5k6
4x 47k
4x 56k
1x 150k
2x 1M

SOCKETS FOR ICs


9x 8 pin
1x 14 pin

CAPACITORS
1x 100p
1x 1n
3x 10n
2x 22n
2x 33n
2x 47n
3x 100n

ELECTROLYTIC & TANTALUM CAPACITORS


2x 100n (marked µ1 on the PCB)
6x µ47
2x 2µ2 TANTAL
4x 10µ
2x 100µ
1x 220µ
TRANSISTORS
19x BC547 (including the “Noisy Transistor”)
4x BC557

DIODES & SEMICONDUCTORS


2x 1N4148
2x 2N5485
1x 7808T

HEADERS
2x 7 x 2 Pin header (install longest spacers between the two PCBs to find the right distance,
then install the corresponding headers on the other PCB)

WASH
Now is the right time to wash the PCB if you want to.
Howto: https://www.youtube.com/v/Eve1jRwo2cg

SEMICONDUCTORS AND IC
1x TL497
1x 220µH
2x TL802
7x LM4558N
5x LED3MM (short leg in square pad)

TRIMMERS
3x 100k

POTENTIOMETERS
6x 100kA
6x 100kB
2x 500kA
2x 10kA

MISC AND HARDWARE


1x DC JACK
4x ON-OFF-ON Switch
3x ON-ON Switch

TEST BOARD 1:
- Connect the 12V positive tip PSU.
- Switch power on.
- Measure voltage on upper TL082 to be 16V over legs 4 and 8.
- ...or +/- 8V over the blue electrolytic caps.
Board 2 & 3 (multiply all quantities by 2, one for each board):

RESISTORS
34x 100k
23x 1k
20x 47k
10x 10k
1x 100
1x 560
4x 4k7
2x 22k
2x 33k
1x 150k
4x 220k
3x 330k
3x 470k
2x 1M

SOCKETS FOR ICs


3x 8 pin
3x 14 pin

CAPACITORS
7x 1n
1x 2n2

ELECTROLYTIC & TANTALUM CAPACITORS


1x .47u (marked µ47 on the PCB)
4x 1u
2x 10u
2x 220u

DIODES
8x 1n4148

TRANSISTORS
23x BC547
18x BC557

WASH
Now is the right time to wash the PCB if you want to.
Howto: https://www.youtube.com/v/Eve1jRwo2cg
ICs
2x 1458
3x 4069
1x 4558

MISC​ ​AND HARDWARE


Jacks, trimmers, pots, pushbutton.

Wire “Point A” to “Point A” to normal both channels to output 1.

FINISHING UP
- Trim the noise level: Set OSC mode to A, and start with max noise level. Reduce until
noise no longer bleeds into the oscillator.
- Trim VCO2 frequency to 450Hz when VCO1 is tuned to 440Hz.
- Trim V/Oct.
- Find optimal resistor value for LFO at lowest speed (suggested 680 Ohm).

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