2n404 equivalent

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

POTAR March 19, 2025

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

Russian Germanium PNP Fuzz Face Transistors – MP16b