2 layers40.5 × 100 mm
4 layers40.5 × 100 mm
Vcafd
GuavTek/ACID_VCA1A eurorack VCA with a wavefolder and drive/clipping
- Size
- 40.5 × 100 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 223
- Nets
- 141
- Pads
- 583
- Tracks, vias
- 939, 173
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 27 Mar 2025
- Updated
- 19 May 2025
Overview
Vcafd is an open-source printed circuit board by GuavTek, from the GuavTek/ACID_VCA repository on GitHub, published under the CERN-OHL-W-2.0 licence. It is a 4-layer board of 40.5 × 100 mm with 223 parts on 141 nets, routed with 939 tracks and 173 vias.
It is built around the TL072, LM13700M and MMBT3906, with the MMBT3904, BSS84 and DMN6075S among its other parts. Its parts include 95 resistors, 58 diodes, 28 transistors, 27 capacitors and 11 ICs.
Main components
8
TL072
SOP-8-18V~18V 0℃~+70℃ 1.4mA 1.5nA 10V/us 10mV 2 2.5nA 3MHz 85dB SOP-8 Operational Amplifier ROHSGcoreOperational Amplifier
LM13700M
SOIC-16-16V~-4.75V、4.75V~16V 0℃~+70℃ 110dB 2 2.6mA 20mA 400nA 4mV 50V/us 600nA 9.5V~32V SOIC-16 Operational Amplifier ROHSTexas InstrumentsOperational Amplifier
MMBT3906
SOT-23-55℃~+150℃ 1 PNP 100 100nA 200mA 200mW 300MHz 300mV 40V 5V PNP SOT-23 Bipolar (BJT) ROHSTWGMCBipolar (BJT)MMBT3904
SOT-23-55℃~+150℃ 1 NPN 100 100nA 200mA 200mW 300MHz 300mV 40V 6V NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)BSS84
SOT-23-55℃~+150℃ 1 P-Channel 130mA 2.8pF 24.6pF 2V 3.2Ω@5V 300mW 4.7pF 50V 590pC@10V SOT-23 MOSFETs ROHSDiodes IncorporatedMOSFETsDMN6075S
SOT-23-55℃~+150℃ 1 N-channel 125mΩ@4.5V 19.5pF 247pF 350mW 3A 500mV 60V SOT-23 MOSFETs ROHSTECH PUBLICMOSFETsDMP3099L
SOT-23-55℃~+150℃ 1 P-Channel 1.08W 11nC@10V 2.1V 3.8A 30V 41pF 563pF 99mΩ@4.5V SOT-23 MOSFETs ROHSDiodes IncorporatedMOSFETsMMBFJ113
SOT-23-55℃~+150℃ 1 N-channel 100Ω 350mW 500mV、3V N-Channel SOT-23 JFETs ROHSonsemiMOSFETs
README
README.mdSchematic and PCB renders can be found on CADLAB.io
Parts
223| Qty | Value | Footprint | References |
|---|---|---|---|
| 58 | 1N4148 | Diode_SMD:D_SOD-323_HandSoldering | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +42 |
| 34 | 100k | Resistor_SMD:R_0603_1608Metric | R1, R2, R3, R4, R5, R10, R11, R13, R20, R39, R40, R41, R49, R50, R51, R52 +18 |
| 23 | 100nF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C10, C11, C12, C13, C14, C16, C17, C18, C19, C20, C21, C25, C26, C27 +7 |
| 13 | 1k | Resistor_SMD:R_0603_1608Metric | R6, R42, R43, R44, R46, R47, R48, R70, R71, R72, R74, R75, R76 |
| 13 | MMBT3906 | Package_TO_SOT_SMD:SOT-23 | Q5, Q6, Q8, Q10, Q11, Q14, Q15, Q17, Q20, Q22, Q24, Q25, Q28 |
| 11 | MMBT3904 | Package_TO_SOT_SMD:SOT-23 | Q3, Q4, Q7, Q9, Q12, Q13, Q16, Q18, Q19, Q23, Q27 |
| 10 | TL072 | Package_SO:SO-8_3.9x4.9mm_P1.27mm | U1, U2, U3, U4, U6, U7, U8, U9, U10, U11 |
| 6 | 10k | Resistor_SMD:R_0603_1608Metric | R9, R16, R17, R55, R62, R63 |
| 6 | 1M | Resistor_SMD:R_0603_1608Metric | R7, R8, R83, R85, R86, R91 |
| 6 | 200 | Resistor_SMD:R_0603_1608Metric | R29, R30, R31, R32, R45, R73 |
| 5 | NC | Resistor_SMD:R_0603_1608Metric | R25, R27, R33, R34, R84 |
| 4 | 470n C0G | Capacitor_SMD:C_1206_3216Metric | C15, C22, C23, C24 |
| 3 | 12k | Resistor_SMD:R_0603_1608Metric | R22, R24, R90 |
| 3 | Conn_01x09_Socket | Connector_PinSocket_2.54mm:PinSocket_1x09_P2.54mm_Vertical_SMD_Pin1Left | J2, J3, J4 |
| 2 | 18k | Resistor_SMD:R_0603_1608Metric | R19, R65 |
| 2 | 1M5 | Resistor_SMD:R_0603_1608Metric | R54, R82 |
| 2 | 200k | Resistor_SMD:R_0603_1608Metric | R14, R60 |
| 2 | 20k | Resistor_SMD:R_0603_1608Metric | R15, R61 |
| 2 | 2k | Resistor_SMD:R_0603_1608Metric | R18, R64 |
| 2 | 39k | Resistor_SMD:R_0603_1608Metric | R35, R36 |
| 2 | 47k | Resistor_SMD:R_0603_1608Metric | R26, R28 |
| 2 | 4k3 | Resistor_SMD:R_0603_1608Metric | R12, R58 |
| 2 | 4k7 | Resistor_SMD:R_0603_1608Metric | R21, R23 |
| 2 | 51k | Resistor_SMD:R_0603_1608Metric | R37, R38 |
| 1 | 1M2 | Resistor_SMD:R_0603_1608Metric | R88 |
| 1 | 30k | Resistor_SMD:R_0603_1608Metric | R89 |
| 1 | BSS84 | Package_TO_SOT_SMD:SOT-23 | Q26 |
| 1 | Conn_02x08_Odd_Even | Custom:Header_2x8_Shrouded_SMD | J1 |
| 1 | DMN6075 | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | DMP3099 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | LM13700 | Package_SO:SO-16_3.9x9.9mm_P1.27mm | U5 |
| 1 | MMBFJ113 | Package_TO_SOT_SMD:SOT-23 | Q21 |
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Questions
How big is the Vcafd PCB?
It measures 40.5 × 100 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Vcafd use?
223 parts, built around the TL072, LM13700M, MMBT3906 and MMBT3904. 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 Vcafd KiCad files?
From the GuavTek/ACID_VCA repository on GitHub, at the commit this page was made from: the board is core/vcafd.kicad_pcb and its schematic core/agc.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Vcafd design in my own project?
Its repository publishes it under the CERN-OHL-W-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).