DOD - FX55C Supra Distortion

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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TWAlex
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http://www.americaspedal.net/fx55c/
***From the manual: "The FX55C is a very high-gain preamplifier that when overdriven produces a distorting of the input signal and help sustain the notes longer. These effects simulate the characteristic distortion of a guitar amplifier turned up so high that it "clips" the signal, distorting it. The FX55 has an extra amount of gain boost in its upper range for a greater distortion effect. ... The FX55C's distortion is a symmetrical standard distortion sound with a boost of gain in its upper range."***

Factory schematic and components 2000:
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board 1998
board 1998
FX55C.jpg
FX55C.jpg (60.54 KiB) Viewed 870 times
FX55C -2000.pdf
IC-NJM4560, factory schematic and components
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