polyUAnalog

An open-source (MIT) analog polyphonic synthesizer — a full hardware-plus-firmware project from the physics department of the University of Angers (physics-dept-angers): PCB schematics and board designs for voice boards, a conductor board, and a controller, with firmware mostly in C.

Conductor–voice architecture

Each voice board is a self-contained monophonic synth; a conductor board orchestrates them, scaling from 10+ up to roughly 120 voices. It supports polyphonic, mono-unison, and multitimbral modes. The design uses DCOs (digitally-controlled oscillators) rather than free-running VCOs, trading a little analog character for tuning stability — the standard DCO bargain. This modular, board-per-voice layout is a hardware cousin of the modular-routing idea: capability comes from composing many small identical units.

Audience

Aimed at electrical engineers, developers, and DIY / education / research builders — a university-origin synthesizer you assemble and flash yourself, at the opposite pole from a finished commercial instrument like filtopia. Ingested as a first-party open repo → T1 for what it claims to be, though untested here.