ampage Tube Amps / Music Electronics	For current discussions, please visit Music Electronics Forum.

ampage archive

Vintage threads from the first ten years

previous: CJ Landry I have the schematic for the vol/wa... -- 8/2/1999 9:40 PM

Re: MuTron C200 Vol/Wah - DEAD "optos"

8/3/1999 5:25 AM
Charlie	Re: MuTron C200 Vol/Wah - DEAD "optos" the pedal "expression" controls the current through the phototransistor(s)... the way you describe it CJ, it sounds like there a slit in the "blade" that is wide at one end and narrow at the other, mechanically varying light to the sensor... I imagine it would be simpler to vary the current through the diode to control LED brightness probably only one side is bad (the photodiode/transistor sensor) and maybe it's the only thing that needs to be replaced - LEDs are typically pretty robust

8/3/1999 5:25 AM

Charlie

Re: MuTron C200 Vol/Wah - DEAD "optos"

the pedal "expression" controls the current through the phototransistor(s)... the way you describe it CJ, it sounds like there a slit in the "blade" that is wide at one end and narrow at the other, mechanically varying light to the sensor... I imagine it would be simpler to vary the current through the diode to control LED brightness

probably only one side is bad (the photodiode/transistor sensor) and maybe it's the only thing that needs to be replaced - LEDs are typically pretty robust