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Vca-8

polykit·vca-8

Vca-8 PCB layout, top view — open source board by polykit
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About the Vca-8 PCB

Vca-8 is an open source PCB design by polykit, published on GitHub. It is a 2-layer board measuring 114 × 123 mm, with 168 components from 18 distinct parts.

Other key parts include the TL072. By type, the board carries 104 resistors, 24 transistors, 10 capacitors, 8 ICs, 3 connectors and 2 inductors.

It belongs with the audio designs in this gallery.

From the project

Schematics and layout for 8 VCAs on one PCB

This repository contains Kicad schematics and PCB layout for a VCA with 8 independent voices.

http://yusynth.net/Modular/EN/VCA/index.html

https://kassu2000.blogspot.com/2015/10/vca.html

Vca-8, from the project README
From the project README

Main components on the Vca-8

TL072

Vca-8 bill of materials (BOM)

168 components, 18 distinct parts.

QtyPartRefs
8
TL072
U1, U2, U3, U4, U5, U6, U7, U8
16
2N3904*
Q1, Q2, Q4, Q6, Q7, Q9, Q10, Q12 +8
8
2N3904
Q3, Q5, Q8, Q11, Q14, Q17, Q20, Q23
1
IN
J1
1
CV
J2
1
OUT
J3
8
100k
LEVEL1, LEVEL2, LEVEL3, LEVEL4, LEVEL5, LEVEL6, LEVEL7, LEVEL8
8
1k
OFFSET1, OFFSET2, OFFSET3, OFFSET4, OFFSET5, OFFSET6, OFFSET7, OFFSET8
1
Conn_02x05_Odd_Even
POWER1
2
Ferrite_Bead
FB1, FB2
8
100n
C1, C2, C3, C4, C5, C6, C7, C8
2
47u
C9, C10
8
220k
R3, R13, R33, R48, R63, R78, R93, R108
8
47k
R4, R14, R34, R49, R64, R79, R94, R109
8
1k
R5, R15, R35, R50, R65, R80, R95, R110
24
22k
R6, R7, R9, R16, R17, R19, R36, R37 +16
40
10k
R8, R10, R18, R20, R21, R22, R23, R26 +32
16
150k
R24, R25, R29, R30, R44, R45, R59, R60 +8

Vca-8 design files

The KiCad project lives in the polykit/vca-8 repository on GitHub; these links point at the commit this page was built from.

Vca-8: common questions

How big is the Vca-8 PCB?

The Vca-8 measures 114 × 123 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Vca-8?

168 components, from 18 distinct parts. The full bill of materials is listed on this page.

Where can I download the Vca-8 design files?

From the polykit/vca-8 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Vca-8 design in my own project?

The repository has no license, so all rights stay with polykit. Use it as a reference, and ask the author before reusing the design.

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