Audio Kits

Sound Urchin kits – more kits to follow.

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Get weird with it!Not your usual Sound Urchin, I took this little Hey Jude music box and mounted it right...

POTAR November 1, 2025

After building out the Fuzz Calculators I decided I wanted a helper to calculate the capacitor and resistor combos for...

POTAR October 26, 2025

When building fuzz and overdrive pedals, proper transistor biasing is key to getting the tone, sustain, and response just right....

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

I created a backup site of the excellent Microphonium Schematic Archive. The sdiy.com domain that it resides at is up...

POTAR June 8, 2025

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POTAR April 9, 2025

Sound Urchin Circuit Kit