This is the simplest possible synthesizer: No modulation, no envelopes, no filtering, no built-in effects - just a single relaxation oscillator controlled by a single variable resistor.
It uses a pencil as a conductive stylus for adjustable contact on a resistive strip made by applying a thin layer of graphite (i.e. scribbling with a pencil) on paper.
Normally, the frequency varies smoothly over the length of the paper strip, but Auto-Tune allows you to restrict the sound to a discrete set of pitches, just like a real Stylophone!

Schematic: [ Ссылка ]
Component list: [ Ссылка ]

I think the circuit I used might be one of the simplest possible ways to get this to work. It does not use a 555 timer, or any other IC chips.

Original Circuit: [ Ссылка ]


Music in this video:
Sirius Jazz by Jeremy Blake
[ Ссылка ]
Contact High by RKVC
[ Ссылка ]








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