Here’s some DIY projects that has partly or completely developed by Dmitry Shtatnov.
Firmware
Alternative firmware for ACXSynth MIDI2CV
Hardware
Modules
Regulated Bipolar PSU (OEM)
Low-Cost PSU (OEM)
Adjustable Tom (Eurorack)
Wob-Wob Fader (Eurorack)
Modifications
CV/Gate inputs for the RITM-2 synthesizer
ESI Gigaport HD DC-coupling mod
Stand-alone devices
Interferophone