Okay, that looks like a challenge.
How about it? I propose this: Collaboratively design a Kosmo voice module. A single module offering the basics of a full synth voice, so at least one oscillator along with means to vary its sound (filter, waveshaper…) and amplitude (VCA, LPG) with modulation source(s) (LFO, EG, slope generator…). The idea is to have something not as powerful and flexible as a set of individual modules, but offering a good subset of that power and flexibility in a compact and relatively low cost package. It could be the basis of a small monosynth, or an addition to a full modular, or several could be used to create a polyphonic synthesizer.
“Collaboratively” implies contributions from multiple people — and they don’t all have to be circuit designs. Anyone with any general ideas, specific requests, block diagrams, panel art concepts, whatever, feel free to jump in. I recommend starting with general functionality, moving on to user interface, and only then designing circuitry.
To focus creativity and keep the project of manageable scope, some constraints (open to negotiation for now):
- Conform to Kosmo spec
- Design to allow building as stripboard or PCB (self etched or commercially fabbed)
- Maximum panel width 20 cm
- Bonus points for keeping PCB(s) small enough (under 11 cm vertically) to allow building it as Eurorack too
- Use only readily (commercially) available parts
- Limited maximum component cost — I’m thinking something like $75 US (including commercial fabrication of PCB and front panel — let’s say 1/10 of cost to make 10 at JLCPCB) (excluding postage) but let’s see. I’m a cheapskate and may be indulging in fantasy.
For inspiration here are a few Eurorack voice modules, find more via modulargrid:
- A-111-5 (Doepfer) A-111-5 Mini Synth
- West Coast Mini Synth (CGS) [BUILD] - CGS Euro Modules - MUFF WIGGLER
- VM-1 (Cwejman) Cwejman synthesizers
- Koe (Atomosynth) AtomoSynth Koe
So, anyone in?