MP16b trans

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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

...

POTAR April 9, 2025

Sound Urchin Composer #005

contact mics Custom sound sound design Sound Urchin

Sound Urchin Composer #005

Sound Urchin Composer series instruments are always a little differentThey all feature resonant bowls, tiered threaded rods, and the...

POTAR March 19, 2025

Sound Urchin COLONY 2025

Sound Urchin COLONY - now available

NEW from POTAR Design!The latest in Sound Urchin technology, the COLONY. Three urchins perched at different heights, affecting both pitch...

POTAR March 17, 2025