My modular synthesizer designs are shared in this repository.
Please note that I am a hobbyist, not a trained electronics engineer! These designs are not perfect. The modules work for me, but I can’t promise they’ll work for everyone who builds them.
These designs are shared as open source. See the license details in each project and source file.
– Len
Front Panels — How I make the front panels for my modules
Component Selection — Some notes on which parts to use when building these modules
Eurorack Bus CV and Gate — Spaghetti reduction
Firmware Programming — How to program the firmware onto the microcontrollers in some modules
Discussions — Forum for questions, comments, and conversations
These are the modules that I have built so far:
VCF-SV — State-variable filter module
Adder — Unity-gain mixer / precision adder
FX — Digital effects module
Attenuverter — Dual attenuverter module
VCF-4P — 4-pole lowpass filter module
Mixer1 — Small mixer module
Mixer2 — Dual mixer module
Buff-Mult — Buffered multiples
Bus-Driver — Driver module for Eurorack bus CV & gate signals
VCA-4 — Quad exponential VCA
Audiout — Audio output module
VCO-2131 — Analog VCO based on the SSI2131 chip
Envelope2 — Dual ADSR envelope module, microcontroller-based
Wavefolder — Dual analog wavefolder module
LFO-DigiVC — Voltage-controlled LFO, microcontroller-based
Noise-SH — Noise, sample-and-hold, and trigger clock, all in one module
Power-Supply — Eurorack power supply using a laptop charger
Cable Hanger — Simple desk-mounted patch cable rack