This synth was a work in progress from mid-2012 until last year when I finally got around to finishing it. It's based on a heavily modified Korg Monotron; giving it a full-size two octave keyboard with mod wheel, a sub-oscillator, a variable pulse wave and more. The digital side is running on Arduino code and supports MIDI, although that functionality isn't shown here. The case is laser-cut MDF with an aluminium panel and the keyboard mechanism was re-purposed from a dead M-Audio MIDI controller.

Photos, code and schematics can be found here:
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