Clean Overdrive with Fuzz PUBLIC

Overdrive with 3-Band Tone and Optional Fuzz

Clean Overdrive with 3-band tone and optional fuzz. Based on the preamp for the High-Power FET Stereo Amp by Leo Simpson and John Clarke, Radio Electronics mag., July 1986, p57. However, many modifications were made, including adding an extra op-amp, altering circuitry, and changing part-values to increase overall gain and obtain a preferred response curve. Controls Include: Drive 1, Input Gain, Bass, Treble, Drive 2, Fuzz enable switch, Fuzz symmetry switches (two, with 2 settings each), Fuzz Depth, Output Gain, and Volume. Range at or above 0 dBV is from 48 Hz to 20 kHz, with emphasis on the mids. Recommended for 6/7-string guitar, 4-string bass, or 5-string bass with high C instead of low B. [Not good for 8-string guitars, or 5-string bass with low B, or 6-string bass). Maximum gain = +36.2 dBV (Vo/Vi = 64.6) @ 630 Hz with all controls at 50%, or +53.2 dBV (Vo/Vi = 457) @ 400 Hz with all controls at 100%. This qualifies the circuit for being in the overdrive category. With specified IC, circuit should operate very cleanly, even with controls set > 50%, with Fuzz disabled. Power-supply not shown. Requires a regulated dual-polarity DC supply providing +-9VDC or +-12VDC or +-15VDC at >= 40 mA of current. And while based on a proven circuit, plus being simulator verified, treat the circuit as experimental in nature. Breadboard test it before committing to a soldered build.