HardLabs

Quad Tube VCA

ob1techno·valvs·KiCad/Quad Tube VCA.kicad_pcb

Quad Tube VCA PCB layout, top view — open source board by ob1techno

About the Quad Tube VCA PCB

Quad Tube VCA is an open source PCB design by ob1techno, published on GitHub. It is a 2-layer board measuring 162.6 × 100.3 mm, with 228 components from 31 distinct parts.

Other key parts include the TL072 and LM358. By type, the board carries 99 resistors, 54 capacitors, 10 ICs, 10 diodes, 2 inductors and 1 jumper.

It belongs with the audio designs in this gallery.

From the project

A cascading quad tube VCA module in Eurorack format.

Vālvs provides four gnarly tube VCAs with drive, gain, feedback, and adjustable, switchable distortion controls.

Vālvs’ outputs are daisy-chained, allowing adjacent groups of 2, 3, or all 4 channels to be mixed together.

Based on/inspired by the work of Ken Stone, L-1 and Émilie Gillet, using NOS Soviet 1Ж24Б tubes; as used in the Спутник 1 satellite and Восток 1 spacecraft!

Quad Tube VCA, from the project README
From the project README

Main components on the Quad Tube VCA

TL072LM358

Quad Tube VCA bill of materials (BOM)

228 components, 31 distinct parts — part numbers from the project's BOM.

QtyPartRefs
6
TL072
IC1, IC2, IC4, IC6, IC7, IC9
4
LM358
IC3, IC5, IC8, IC10
1
EURO_PWR_2X5
EURO_PWR_2x5
JP1
12
PJ301M-12
J_CV_IN1, J_CV_IN2, J_CV_IN3, J_CV_IN4, J_IN1, J_IN2, J_IN3, J_IN4 +4
4
B100k
POT_CV_LEVEL1, POT_CV_LEVEL2, POT_CV_LEVEL3, POT_CV_LEVEL4
12
A100k
POT_FEEDBACK1, POT_FEEDBACK2, POT_FEEDBACK3, POT_FEEDBACK4, POT_GAIN1, POT_GAIN2, POT_GAIN3, POT_GAIN4 +4
4
SW_SPDT
SW_DIST1, SW_DIST2, SW_DIST3, SW_DIST4
8
100k
TRIM_CLEAN1, TRIM_CLEAN2, TRIM_CLEAN3, TRIM_CLEAN4, TRIM_CV_INIT1, TRIM_CV_INIT2, TRIM_CV_INIT3, TRIM_CV_INIT4
4
1M
TRIM_DIST1, TRIM_DIST2, TRIM_DIST3, TRIM_DIST4
4
20k
TRIM_PLATE1, TRIM_PLATE2, TRIM_PLATE3, TRIM_PLATE4
4
1J24B
V1, V2, V3, V4
2
1N5819
D1, D2
8
LED
D3, D4, D5, D6, D7, D8, D9, D10
2
Ferrite
FB1, FB2
2
10UF
10uf
C1, C2
16
47PF
47pf
C3, C4, C8, C9, C17, C18, C24, C25 +8
8
470NF
470nf
C5, C6, C19, C20, C31, C32, C45, C46
4
47UF
47uf
C7, C21, C33, C47
24
100NF
100nf
C10, C11, C12, C13, C14, C15, C16, C22 +16
4
1k
R1, R24, R48, R72
Show 11 more
QtyPartRefs
8
33K
33k
R2, R12, R25, R36, R49, R60, R73, R84
46
100K
100k
R3, R4, R5, R8, R9, R14, R17, R21 +38
4
8K2
8k2
R6, R29, R53, R77
1
100R
R7
4
330R
R10, R33, R57, R82
4
2K2
2k2
R11, R35, R59, R83
4
750R
R13, R37, R61, R85
8
1K2
1k2
R15, R16, R38, R40, R63, R66, R87, R89
8
220K
220k
R18, R19, R42, R43, R65, R67, R90, R91
4
51K
51k
R20, R44, R68, R92
4
10K
10k
R22, R46, R70, R94

Quad Tube VCA design files

The KiCad project lives in the ob1techno/valvs repository on GitHub; these links point at the commit this page was built from.

Quad Tube VCA: common questions

How big is the Quad Tube VCA PCB?

The Quad Tube VCA measures 162.6 × 100.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Quad Tube VCA?

228 components, from 31 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Quad Tube VCA design files?

From the ob1techno/valvs repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Quad Tube VCA design in my own project?

The repository has no license, so all rights stay with ob1techno. Use it as a reference, and ask the author before reusing the design.

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