This is intended as a resource for people wanting to make Kosmo modules out of non-Kosmo PCBs — or other such format conversions.
Here are some sources for bare circuit boards for synth modules. Some may also sell kits, PCB/panel sets, assembled modules, or boards for non synth module projects, but all have bare synth module PCBs available separately.
Wiki post, add info if you have it.
There are numerous vendors on Tindie as well, mostly too small and transient for this list, but larger and more stable ones may be added individually below.
For Kosmo builds you can use boards designed for Eurorack (with some ingenuity, some or all board mounted components may need to be replaced with panel mount, and then the PCB mounting may need to be figured out). No electrical changes needed unless it uses the 5V rail or CV/gate distribution, which very few modules do. Of course going the other way (Kosmo to Eurorack) is usually impeded by the size of the PCB.
Other format conversions may need modification to handle differing power supply requirements etc.
| Vendor | Country | Formats* |
|---|---|---|
| amazingsynth.com | UK | e |
| Barton Musical Circuits | US | e,mm |
| Buchla PCBs @ fluxmonkey | US | 4,g |
| Buchla style PCBs @ The Beast | UK | g |
| David Haillant | FR | e |
| Elby Designs | AU | mm |
| Fitzgreyve Synthesis | UK | e |
| J. Haible PCBs @ Random*Source | DE | g |
| Kassutronics | FI | e |
| L-1 Synthesizer | US | e |
| Low Gain Electronics | US | 4 |
| Modular Addict | US | 4,e,g,mm |
| MOTM Synthesizers | US | mm |
| Music From Outer Space | US | g |
| Nonlinear Circuits | AU | e |
| Oakley Sound Systems | UK | e,mm,g |
| Prism Circuits | US | 4 |
| Slightly Nasty | AU | 4 |
| Soundtronics | UK | g,m,mm |
| SynthCube | US | e,f,g,mm |
| Thonk | UK | 4,e |
* 4 = 4U/Buchla
e = Eurorack
f = FracRack
g = generic (no power header)
k = Kosmo
m = MU
mm = MOTM