2 layers142.5 × 106.4 mm
2 layers99.1 × 50.8 mm
StompFork
jurihock/StompFork1Active audio signal splitter to drive multiple parallel stompboxes
- Size
- 99.1 × 50.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 34
- Nets
- 22
- Pads
- 82
- Tracks, vias
- 158, 8
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 17 May 2026
- Updated
- 15 Jun 2026
Overview
StompFork is an open-source printed circuit board by jurihock, from the jurihock/StompFork repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 99.1 × 50.8 mm with 34 parts on 22 nets, routed with 158 tracks and 8 vias.
Its parts include 13 resistors, 11 capacitors, 5 connectors, 2 diodes and 1 IC. It belongs with the audio and music boards of this library.
README
README.mdStompFork
This project is about an active audio signal splitter that utilizes the TL074 opamp to drive multiple parallel stompboxes.
Key features
- Split one line-level input into three outputs
- Direct output (unity from input buffer)
- Stompbox output 1 (level pot + output buffer)
- Stompbox output 2 (level pot + output buffer)
Power supply
- Recommended 18 V
- Should work at 12 V
- May work at 9 V
- Series schottky protection included
Impedance
- Hi‑Z input (~1 MΩ AC)
- Lo‑Z output (~100 Ω AC)
Thoughts
- The circuit should fit on a standard 100x50 mm perfboard. You can save even more space by combining several smaller JST connectors into one larger one.
- Prefer TS patch cables or TRS jacks with R tied to S.
- Depending on the signal path, isolation will probably be necessary:
Caps
Depending on your preference, you can use polarized electrolytic caps in the signal path, or you can replace them with "audiophile" film caps. For this purpose, the KiCad project includes larger footprints for C1 and C5-C7.
If you decide to use the polarized electrolytic caps, ensure that the anode + is facing the opamp and the cathode - is facing the jacks.
Either way be sure to pick a sufficient voltage rating, e.g. 50 V.
Similar projects
Further reading
Example build
Parts
34| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 100 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5, R6, R7 |
| 3 | 100k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8, R9, R10 |
| 3 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R2, R3, R4 |
| 3 | 22uF | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C5, C6, C7 |
| 3 | 47pF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C2, C3, C4 |
| 2 | 100nF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C8, C10 |
| 2 | 10k | Connector_JST:JST_EH_B3B-EH-A_1x03_P2.50mm_Vertical | RV1, RV2 |
| 2 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R11, R12 |
| 1 | 100uF | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C9 |
| 1 | 1M | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R1 |
| 1 | 1N5819 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1 |
| 1 | 1uF | Capacitor_THT:CP_Axial_L18.0mm_D8.0mm_P25.00mm_Horizontal | C1 |
| 1 | 3k3 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R13 |
| 1 | 47uF | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C11 |
| 1 | Direct Output | Connector_JST:JST_EH_B2B-EH-A_1x02_P2.50mm_Vertical | J2 |
| 1 | LED | Connector_JST:JST_EH_B2B-EH-A_1x02_P2.50mm_Vertical | D2 |
| 1 | Line-Level Input | Connector_JST:JST_EH_B2B-EH-A_1x02_P2.50mm_Vertical | J1 |
| 1 | Power | Connector_JST:JST_EH_B2B-EH-A_1x02_P2.50mm_Vertical | J5 |
| 1 | Stompbox Output 1 | Connector_JST:JST_EH_B2B-EH-A_1x02_P2.50mm_Vertical | J3 |
| 1 | Stompbox Output 2 | Connector_JST:JST_EH_B2B-EH-A_1x02_P2.50mm_Vertical | J4 |
| 1 | TL074 | Package_DIP:DIP-14_W7.62mm_Socket | U1 |
Questions
How big is the StompFork PCB?
It measures 99.1 × 50.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the StompFork use?
34 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 StompFork KiCad files?
From the jurihock/StompFork repository on GitHub, at the commit this page was made from: the board is hardware/StompFork/StompFork.kicad_pcb and its schematic hardware/StompFork/StompFork.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the StompFork 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).
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