Sound Urchin Composer

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Hey Jude Sound Urchin

Custom Sound Urchin

The Hey Jude Sound Urchin

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

potar hex schmitt synth elcectro calculator

diy synth tools

Hex Schmitt Synth Calculator

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

POTAR October 26, 2025

Fuzz Bias Calculator

Fuzz Bias Calculators

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

POTAR October 22, 2025

Bend Points cassette player mods Circuit Bent Circuit Bent/Bending Custom MODS schematic tape speed mod Vero Layouts

Pitch control for cassette players

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

m249 schematic

Microphonium Backup Site

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

POTAR Custom Noise Box Guirro

noise sound sound design Sound Urchin

Some new noise

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POTAR April 9, 2025