2 layers45 × 22 mm
Synth chipz klein vcf
CircuitMonkey/CHIPs
This module is a CHIPz implementation of a Envelope Gate. Featuring Attack and Decay controls.
57 partsApache-2.0
2 layers21 × 22 mm
Synth chipz vca
CircuitMonkey/CHIPsThis module is a CHIPz implementation of a Envelope Gate. Featuring Attack and Decay controls.
- Size
- 21 × 22 mm
- Copper layers
- 2
- Thickness
- 0.8 mm
- Parts
- 32
- Nets
- 22
- Pads
- 65
- Tracks, vias
- 129, 44
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 23 Feb 2021
- Updated
- 29 Mar 2026
Overview
Synth chipz vca is an open-source printed circuit board by CircuitMonkey, from the CircuitMonkey/CHIPs repository on GitHub, published under the Apache-2.0 licence. It is a 2-layer board of 21 × 22 mm with 32 parts on 22 nets, routed with 129 tracks and 44 vias.
It is built around the LM13700M and BC856. Its parts include 13 resistors, 3 capacitors, 1 IC and 1 transistor. It belongs with the audio and music boards of this library.
Main components
2README
Synth/synth-chipz-env-gate/README.mdSynth Module -- Envelope Gate
This module is a CHIPz implementation of a Envelope Gate. Featuring Attack and Decay controls.
The design is based on a Moog circuit.
Parts
32| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 10.0K | CM_Resistor_Capacitor:R_0603_1608Metric | R2, R4, R6 |
| 3 | 1K | CM_Resistor_Capacitor:R_0603_1608Metric | R11, R12, R13 |
| 2 | 1uF/25V | CM_Resistor_Capacitor:C_0603_1608Metric | C2, C3 |
| 1 | +V | CM_Connector_Castelated:cast-2.0-01P | CST11 |
| 1 | -V | CM_Connector_Castelated:cast-2.0-01P | CST13 |
| 1 | 12.1K | CM_Resistor_Capacitor:R_0603_1608Metric | R9 |
| 1 | 2.2uF/25V | CM_Resistor_Capacitor:C_0603_1608Metric | C1 |
| 1 | 33.2K | CM_Resistor_Capacitor:R_0603_1608Metric | R1 |
| 1 | 4.75M | CM_Resistor_Capacitor:R_0603_1608Metric | R7 |
| 1 | 4.99K | CM_Resistor_Capacitor:R_0603_1608Metric | R8 |
| 1 | 475R | CM_Resistor_Capacitor:R_0603_1608Metric | R10 |
| 1 | 499K | CM_Resistor_Capacitor:R_0603_1608Metric | R5 |
| 1 | 681R | CM_Resistor_Capacitor:R_0603_1608Metric | R3 |
| 1 | BC856 | CM_Chip_Packages:SOT-23 | Q1 |
| 1 | C_BIAS | CM_Connector_Castelated:cast-2.0-01P | CST5 |
| 1 | C_CTL | CM_Connector_Castelated:cast-2.0-01P | CST8 |
| 1 | C_N | CM_Connector_Castelated:cast-2.0-01P | CST4 |
| 1 | C_OUT | CM_Connector_Castelated:cast-2.0-01P | CST7 |
| 1 | C_P | CM_Connector_Castelated:cast-2.0-01P | CST6 |
| 1 | D_BASE | CM_Connector_Castelated:cast-2.0-01P | CST9 |
| 1 | D_EMT | CM_Connector_Castelated:cast-2.0-01P | CST10 |
| 1 | GND | CM_Connector_Castelated:cast-2.0-01P | CST12 |
| 1 | IN | CM_Connector_Castelated:cast-2.0-01P | CST1 |
| 1 | LM13700 | CM_Chip_Packages:SO-16_3.9x9.9mm_P1.27mm | U1 |
| 1 | OUT | CM_Connector_Castelated:cast-2.0-01P | CST3 |
| 1 | Test Point | TestPoint:TestPoint_Pad_D1.5mm | TP1 |
| 1 | VCA_CV | CM_Connector_Castelated:cast-2.0-01P | CST2 |
Questions
How big is the Synth chipz vca PCB?
It measures 21 × 22 mm and has 2 copper layers, 0.8 mm thick.
What parts does the Synth chipz vca use?
32 parts, built around the LM13700M and BC856. 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 Synth chipz vca KiCad files?
From the CircuitMonkey/CHIPs repository on GitHub, at the commit this page was made from: the board is Synth/synth-chipz-vca/synth-chipz-vca.kicad_pcb and its schematic 0131-dcdc-3a/PCB-KiCAD/0131-dcdc-3a/0131-dcdc-3a.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Synth chipz vca design in my own project?
Its repository publishes it under the Apache-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).
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