2 layers167.1 × 363.5 mm
2 layers49.5 × 105.5 mm
Voltage controlled amplifier
gridbugs/modular2- Size
- 49.5 × 105.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 35
- Nets
- 26
- Pads
- 90
- Tracks, vias
- 171, 0
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 22 Nov 2025
- Updated
- 7 Nov 2026
Overview
Voltage controlled amplifier is an open-source printed circuit board by gridbugs, from the gridbugs/modular2 repository on GitHub, published under the MIT licence. It is a 2-layer board of 49.5 × 105.5 mm with 35 parts on 26 nets, routed with 171 tracks and 0 vias.
It is built around the LM13700M and TL072. Its parts include 12 resistors, 10 connectors, 4 capacitors, 4 fuses and 2 ICs. It belongs with the audio and music boards of this library.
Main components
2README
low-pass-filter/README.mdLow-pass Filter
Quirks
V1
- The "Cutoff" potentiometer is reversed.
Parts
35| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 20k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R3, R4, R8, R9, R10 |
| 4 | 100nf | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C1, C2, C3, C4 |
| 4 | foot | modular2:foot | F1, F2, F3, F4 |
| 2 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R7 |
| 2 | 1K | modular2:pot-socket | RV1, RV2 |
| 2 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R6, R12 |
| 2 | 5.1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5, R11 |
| 2 | Pot | modular2:pot | J3, J7 |
| 2 | Power | Connector_IDC:IDC-Header_2x03_P2.54mm_Vertical | J1, J2 |
| 1 | CV 1 | modular2:banana-jack | J5 |
| 1 | CV 2 | modular2:banana-jack | J9 |
| 1 | Input 1 | modular2:banana-jack | J4 |
| 1 | Input 2 | modular2:banana-jack | J8 |
| 1 | LM13700 | Package_DIP:DIP-16_W7.62mm_Socket | U1 |
| 1 | LOGO | modular2:ibis-small | G*** |
| 1 | Output 1 | modular2:banana-jack | J6 |
| 1 | Output 2 | modular2:banana-jack | J10 |
| 1 | TL072 | Package_DIP:DIP-8_W7.62mm_Socket | U2 |
Questions
How big is the Voltage controlled amplifier PCB?
It measures 49.5 × 105.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Voltage controlled amplifier use?
35 parts, built around the LM13700M and TL072. 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 Voltage controlled amplifier KiCad files?
From the gridbugs/modular2 repository on GitHub, at the commit this page was made from: the board is voltage-controlled-amplifier/voltage-controlled-amplifier.kicad_pcb and its schematic arduino-delay/arduino-delay.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Voltage controlled amplifier design in my own project?
Its repository publishes it under the MIT 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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