4 layers65.8 × 128.5 mm
2 layers335.3 × 33 mm
Synth bus
jomag/synth-project2Experimental Eurorack Synth DIY Project
- Size
- 335.3 × 33 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 20
- Nets
- 9
- Pads
- 210
- Tracks, vias
- 514, 1
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 15 Aug 2019
- Updated
- 18 May 2025
Overview
Synth bus is an open-source printed circuit board by jomag, from the jomag/synth-project repository on GitHub. It is a 2-layer board of 335.3 × 33 mm with 20 parts on 9 nets, routed with 514 tracks and 1 via.
Its parts include 13 connectors, 3 resistors and 3 diodes. It belongs with the audio and music boards of this library.
README
README.mdProject files for an experimental, DIY modular synth in Eurorack format.
Casing
Threaded strips: 2x5x432 mm (also available in 203.2 mm). Hole distance: 5.08 mm.
https://gie-tec.de/product/threaded-strips/?lang=en
References
A lot of generic and module specific design tips: http://dintree.com/
Precision tuning of the AS3340 VCO https://cabintechglobal.com/tune3340 http://www.alfarzpp.lv/eng/sc/Tuning%20the%20AS3340.pdf
CEM3340 VCO (Voltage Controlled Oscillator) designs https://electricdruid.net/cem3340-vco-voltage-controlled-oscillator-designs/
Kassutronics blog: VCO CEM3340: https://kassu2000.blogspot.com/2018/06/vco-3340.html
Collection of a few simple Eurorack module PCB and some notes about components etc: https://github.com/nickajeglin/Eurorack-pcbs
Understanding audio jack switches https://www.cuidevices.com/blog/understanding-audio-jack-switches-and-schematic
Timo Rozendal CEM3340 VCO design http://www.timorozendal.com/files/cem3340vco_schematic.pdfs
Parts
20| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | Conn_02x08_Row_Letter_Last | Connector_Multicomp:Multicomp_MC9A12-1634_2x08_P2.54mm_Vertical | J2, J3, J4, J5, J6, J7, J8, J9, J10, J11, J12, J13 |
| 3 | LED | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D1, D2, D3 |
| 3 | R | Resistors_SMD:R_0603_HandSoldering | R1, R2, R3 |
| 1 | Screw_Terminal_01x06 | Connectors_Terminal_Blocks:TerminalBlock_bornier-6_P5.08mm | J1 |
| 1 | Val** | SynthBus:SynthBusArt | Ref** |
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Questions
How big is the Synth bus PCB?
It measures 335.3 × 33 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Synth bus use?
20 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 Synth bus KiCad files?
From the jomag/synth-project repository on GitHub, at the commit this page was made from: the board is synth-bus/synth-bus.kicad_pcb and its schematic midi/rev0/don-midi2cv.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Synth bus design in my own project?
Its repository states no licence, so its author keeps all rights: ask jomag before reusing the design.