2 layers100.8 × 84.8 mm
LFO VC
MitchReyno/Electronics-Projects
A collection of various electronics projects I've worked on over the years
105 partsGPL-3.0
2 layers181 × 113 mm
Quad VCA Mixer
MitchReyno/Electronics-ProjectsA collection of various electronics projects I've worked on over the years
- Size
- 181 × 113 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 132
- Nets
- 147
- Pads
- 447
- Tracks, vias
- 493, 8
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 27 Feb 2026
- Updated
- 25 Jun 2026
Overview
Quad VCA Mixer is an open-source printed circuit board by MitchReyno, from the MitchReyno/Electronics-Projects repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 181 × 113 mm with 132 parts on 147 nets, routed with 493 tracks and 8 vias.
Its parts include 74 resistors, 25 connectors, 17 capacitors, 7 ICs and 4 transistors. It belongs with the audio and music boards of this library.
README
Eurorack/Eurorack_PSU/README.mdEurorack PSU
A mains-powered linear power supply for a Eurorack modular synthesizer case.
What it does
Converts 240 VAC mains to the four standard Eurorack DC rails:
| Rail | Regulator |
|---|---|
| +12 V | LM7812 |
| −12 V | LM7912 |
| +5 V | LM7805 |
| −5 V | LM7905 |
Key components
| Component | Role |
|---|---|
| Mains transformer (240 VAC, 20:1) | Mains isolation and step-down |
| GBU6A | Full-bridge rectifier |
| LM7812 / LM7912 | ±12 V linear regulators |
| LM7805 / LM7905 | ±5 V linear regulators |
| 10 000 µF bulk caps | Reservoir filtering |
| 1N4007 diodes | Rectifier protection |
Files
KiCad 8 project files are in the root directory (.kicad_sch, .kicad_pcb, .kicad_pro).
Revision: 1 (2026-02-28)
Parts
132| Qty | Value | Footprint | References |
|---|---|---|---|
| 28 | 100K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R10, R13, R18, R21, R22, R29, R32, R35, R36, R43, R45, R46, R49, R50 +12 |
| 21 | 100K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R3, R5, R15, R16, R19, R20, R26, R27, R30, R33, R34, R40, R41, R44, R47, R48 +5 |
| 12 | 100nF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C2, C3, C4, C5, C6, C7, C8, C9, C11, C12, C16, C17 |
| 7 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7, R14, R25, R39, R53, R56, R76 |
| 5 | 20K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R11, R23, R37, R51, R67 |
| 5 | TL074 | Package_DIP:DIP-14_W7.62mm_Socket_LongPads | U1, U2, U3, U4, U7 |
| 4 | 100K | Potentiometer_THT:Potentiometer_Bourns_PTL30_LED_Slide | VR1, VR2, VR3, VR4 |
| 4 | 100K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4, R17, R31, R54 |
| 4 | 2N3904 | Package_TO_SOT_THT:TO-92L_Inline_Wide | Q1, Q2, Q3, Q4 |
| 4 | 5K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R24, R38, R52, R68 |
| 4 | Conn_01x08_Pin | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J17, J19, J21, J25 |
| 4 | Conn_01x08_Pin | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J16, J18, J20, J24 |
| 2 | 10uF | Capacitor_THT:CP_Radial_D7.5mm_P2.50mm | C14, C15 |
| 2 | 4.7nF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C1, C10 |
| 1 | 100K | Potentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | VR5 |
| 1 | 10pF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C13 |
| 1 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P12.50mm_Horizontal | R42 |
| 1 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R28 |
| 1 | 200K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R71 |
| 1 | 4.87K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R12 |
| 1 | 5M | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R73 |
| 1 | AS3360 | Package_DIP:DIP-14_W7.62mm_Socket_LongPads | U6 |
| 1 | AS3364 | Package_DIP:DIP-16_W7.62mm_Socket_LongPads | U5 |
| 1 | CV1 | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles_C=JackCenter | J1 |
| 1 | CV2 | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles_C=JackCenter | J3 |
| 1 | CV3 | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles_C=JackCenter | J5 |
| 1 | CV4 | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles_C=JackCenter | J7 |
| 1 | CV_MIX | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles_C=JackCenter | J13 |
| 1 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J23 |
| 1 | Conn_01x04_Pin | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J22 |
| 1 | Conn_02x05_Odd_Even | Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical | J15 |
| 1 | IN1 | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles_C=JackCenter | J2 |
| 1 | IN2 | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles_C=JackCenter | J4 |
| 1 | IN3 | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles_C=JackCenter | J6 |
| 1 | IN4 | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles_C=JackCenter | J8 |
| 1 | MIX_OUT | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles_C=JackCenter | J14 |
| 1 | OUT_1 | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles_C=JackCenter | J9 |
| 1 | OUT_2 | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles_C=JackCenter | J10 |
| 1 | OUT_3 | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles_C=JackCenter | J11 |
| 1 | OUT_4 | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles_C=JackCenter | J12 |
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Questions
How big is the Quad VCA Mixer PCB?
It measures 181 × 113 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Quad VCA Mixer use?
132 parts. 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 Quad VCA Mixer KiCad files?
From the MitchReyno/Electronics-Projects repository on GitHub, at the commit this page was made from: the board is Eurorack/Quad_VCA_Mixer/Quad_VCA_Mixer.kicad_pcb and its schematic Eurorack/Bong0/Bong0_Cat.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Quad VCA Mixer design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).