Open-source Eurorack modules and the tools to build them. Hobbyist designs, fully documented.
Blog: diysynthmnl.github.io
Hi! I'm Rex. I design and build open-source Eurorack modules as a hobby — I've been at it since 2019 with no formal electronics education. Anyone can design and build synth modules — I'm here to help. I try to be thorough with design documentation so these repos can demystify how the modules work and give you ideas for your own designs.
I'm currently a one-person team. Every project here includes schematics, KiCad source, and (where complete) BOMs, panel artwork, and build docs. Each repo's README has a Build status section showing exactly what's ready and what's still TODO.
| Module |
Chip |
Status |
| Electric Druid VCDO1 |
VCDO1 wavetable |
Schematic Rev 0.1.5 · BOM ✓ · Working on documentation |
| AS3340 VCO |
AS3340 |
Schematic Rev 0.1.2 · BOM ✓ · Prototype in progress |
| Module |
Chip |
Status |
| AS3320 Low Pass VCF |
AS3320 |
Schematic Rev 0.1.5 · PCB rev 0.1.0 separated · Re-separation pending |
| Module |
Chip |
Status |
| AS3310 VC ADSR |
AS3310 |
Schematic Rev 0.1.3 · Working on documentation |
| Module |
Status |
| Multi Saturation |
Schematic Rev 0.6 · PCB Rev 0.1 separated · Rev 0.2 fixes pending |
| PT2399 Delay |
Schematic Rev 0.1.1 · Working on documentation |
- DIYSynthMNL.pretty — KiCad footprint library used across all modules (audio jacks, Eurorack power headers, vactrols, big-pad resistors/caps, panel mounting holes)
Spotted a mistake in a schematic, want to add a build photo, or have a calibration tip? Open an issue or PR on the relevant repo — every README has a Build status section showing what's still TODO.
