4 layers68.1 × 53.3 mm VCA, the printed circuit board in 3D

VCA

Size: 68.1 × 53.3 mm
Copper layers: 4
Thickness: 1.6 mm
Parts: 82
Nets: 47
Pads: 183
Tracks, vias: 146, 0
Pours: 151
Routed: Yes
KiCad: KiCad 7 (file 20221018)
Created: 4 Oct 2023
Updated: 2 May 2026

Overview

VCA is an open-source printed circuit board by gehel, from the gehel/synth repository on GitHub. It is a 4-layer board of 68.1 × 53.3 mm with 82 parts on 47 nets, routed with 146 tracks and 0 vias.

It is built around the LM13700M and TL084. Its parts include 42 resistors, 6 capacitors, 4 transistors, 2 ICs and 1 connector.

Main components

Parts

Qty	Value	Footprint	References
19	Conn_01x01_Pin	Connector_Pin:Pin_D1.0mm_L10.0mm	-12V1, +12V1, ADJA1, ADJB1, CMNA1, CMNB1, CV1A1, CV1B1, CV2A1, CV2B1, GND1, INA1, INB1, LINA1, LINB1, LOGA1 +3
16	100K	Library:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R1, R2, R3, R4, R5, R14, R17, R19, R22, R23, R24, R25, R26, R35, R38, R40
6	2K	Library:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R7, R8, R13, R28, R29, R34
4	100nF	Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm	C3, C4, C5, C6
4	20K	Library:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R10, R18, R31, R39
4	MountingHole_Pad	MountingHole:MountingHole_3.2mm_M3_DIN965_Pad	H1, H2, H3, H4
2	100K	Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical	BIASA1, BIASB1
2	10uF	Capacitor_THT:CP_Radial_D4.0mm_P2.00mm	C1, C2
2	120K	Library:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R9, R30
2	150R	Library:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R6, R27
2	1K	Library:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R20, R41
2	2K	Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical	TRIMA1, TRIMB1
2	2M	Library:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R11, R32
2	2N3904	Package_TO_SOT_THT:TO-92_HandSolder	Q1, Q3
2	2N3906	Package_TO_SOT_THT:TO-92_HandSolder	Q2, Q4
2	30K	Library:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R21, R42
2	4.7K	Library:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R15, R36
2	470K	Library:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R12, R33
2	47K	Library:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R16, R37
1	Conn_02x05_Odd_Even	Connector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_Vertical	J9
1	LM13700	Package_DIP:DIP-16_W7.62mm_Socket_LongPads	U2
1	TL084	Package_DIP:DIP-14_W7.62mm_Socket_LongPads	U1

Questions

How big is the VCA PCB?

It measures 68.1 × 53.3 mm and has 4 copper layers, 1.6 mm thick.

What parts does the VCA use?

82 parts, built around the LM13700M and TL084. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the VCA KiCad files?

From the gehel/synth repository on GitHub, at the commit this page was made from: the board is VCA/VCA/VCA.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the VCA design in my own project?

Its repository states no licence, so its author keeps all rights: ask gehel before reusing the design.

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/gehel-synth-vca" title="VCA in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/gehel-synth-vca.jpg" alt="VCA" width="1200" height="900">

A picture that opens the board, for a README

[![VCA](https://pcbkit.io/embed/boards/gehel-synth-vca.jpg?size=s)](https://pcbkit.io/boards/gehel-synth-vca)

Source

Repository: gehel/synth
Board file: VCA/VCA/VCA.kicad_pcb
Commit: 7ca456f
Licence: Not stated

Similar boards

2 layers45.2 × 146.8 mm
Vca
nickajeglin/Eurorack-pcbs
A collection of easy to solder DIY eurorack PCB's
94 parts208
2 layers58.4 × 101.6 mm
Dual VCA #2 Main
mzuelch/CATs-Eurosynth
Analog Synth Eurorack Modules
67 parts166MIT
2 layers101.6 × 76.2 mm
VCA - MFOS
masonandrewmann/modular-synth-pcbs
these are some pcbs :~)
81 parts1
2 layers
PS-101 vco mixer
patricecolet/synth
Atelier synthé analogique : cartes KiCad, firmwares Arduino/Teensy, interfaces Pure Data. Interface MIDI/CV pour RSF Kobol Expander.
39 partsMIT
2 layers97.7 × 58 mm
Bluepill function generator
BojanSof/BluePillWaveGen
DDS function generator build around STM32 BluePill board
41 parts35
2 layers61 × 61 mm
Stm32-rfid clone
joeferner/stm32-rfid-clone
STM32 RFID Reader / Writer
112 parts16
2 layers94.5 × 55 mm
Adsr 1
hermflink/3310ADSR
Dual ADSR based on AS3310
54 parts11GPL-3.0
2 layers105 × 65 mm
Osc 3340
petegaggs/MIDI-to-CV
arduino based MIDI to CV converter
81 parts9MIT