3-Voiced 6-Stage Op-Amp Distortion Circuit PUBLIC

3-Voiced 6-Stage Op-Amp Distortion Circuit with Diode Fuzz

3-voiced 6-stage op-amp distortion circuit with diode fuzz and 3-band tone. The voices are from three different types of op-amps (JFET-input, BJT-input, and CMOS-input). Distortion is obtained by driving one op-amp by another, in three parallel sub-circuits. Fuzz is obtained from standard silicon diodes in a hard-clipping array. And tone-shaping is by a modified Fender tone-stack based on the passive tone-controls in an 5F6-A Bassman amplifier. Controls Include: V1 Gain, V1 Level, V2 Drive, V2 Gain, V2 Level, Fuzz enable switch, Fuzz symmetry switches (two, with 2 settings each), Fuzz Depth, V3 Drive, V3 Gain, V3 Level, High Trim, Low Trim, Bass, Mid, Treble, and Volume. Range tailored to that of a 6-string guitar in standard tuning; i.e., from 80 Hz to 5 kHz, but with emphasis on lows from 250 Hz to 1 kHz. The low -3 dB corner is at 76 Hz, and the high -3 dB corner is at 10 kHz. [Not recommended for 7/8-string guitars or any bass-guitar.] Maximum gain = +30.8 dBV @ 400 Hz with all controls at 50%, or 37.6 dBV @ 250 Hz with all three Gain pots at 100%, but all other controls at 50%. Power-supply not shown. Requires a regulated dual-polarity supply providing +-9VDC or +-12VDC or +-15VDC with >= 25 mA of total current for the circuit.