[sdiy] TR808 PSU tolerance

Rutger Vlek rutgervlek at gmail.com
Fri Jul 22 17:16:41 CEST 2016


Does anyone know the tolerances on the +/- 15V supply in a Roland TR808? I have one measuring about 0.25V above these voltages, and I'm having problems with a transistor-VCA circuit that treats the noise. I'm wondering if the level-shifting resistor before the transistor might be shifting the input too far with this supply voltage, causing asymmetrical distortion on the noise (which affects the half-wave rectification later in the process). 



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