[sdiy] TR808 PSU tolerance

[Rutger Vlek]

Hi,

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). 

Regards,

Rutger