drum machines

Modified, circuit bent, and restored drum machines from POTAR

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Microphone schematics updatedI noticed some naming errors in the 404 logs for a number of the microphone schematics, those have...

POTAR June 3, 2026

New VOMITROIUMS available now!New graphics, new printed circuit boards (instead of vero), and a sound unlike others. The VOMITORIUM can...

POTAR June 2, 2026

The Hey Jude Sound UrchinGet weird with it!Not your usual Sound Urchin, I took this little Hey Jude music box...

POTAR November 1, 2025

Hex Schmitt Synth CalculatorAfter building out the Fuzz Calculators I decided I wanted a helper to calculate the capacitor and...

POTAR October 26, 2025

Fuzz Bias CalculatorsWhen building fuzz and overdrive pedals, proper transistor biasing is key to getting the tone, sustain, and response...

POTAR October 22, 2025

06/18/2025 - Recently updated with better explanation.Here is a stripboard layout that I did for cassette player speed mods....

POTAR June 19, 2025

Alesis HR16, MMT8 REPAIRS