MicroTS, a smallest synth in the world from DIY synthesizer:
The micro-TS is a key fob sized DIY synthesizer (61x41mm) with actually useable knobs like an analog synthesizer. The ball pen is for size reference.
It has a one octave touch keyboard, 6 knobs and a stereo headphone output.
Running on a CR2032 button cell battery it is the smallest playable and programmable synthesizer in the world.
Project info at Janost’s blog.
Check out the video after the break.