Booster with Fuzz and 2-Band Tone PUBLIC

Booster with Fuzz and 2-Band Tone

Booster with fuzz and 2-band tone. Clean direct signal is mixable with boosted + fuzzed + tone-shaped signal. Controls Include: Input Gain, Drive, Driver Gain, Direct Send, Boost Level, Fuzz enable switch, Fuzz symmetry switches, Fuzz Depth, Bass, Treble, and Master volume. Range is from 40 Hz to 16 kHz with all controls at 50%, but which extends in both directions with controls > 50%. Suitable for 6/7-string electric guitar (not recommended for 8-string guitar or bass-guitars). Maximum gain = +22 dBV @ 1 kHz with all controls as 50%, or twice that with controls at 100%. The specified IC was chosen to ensure clean operation except when Fuzz is enabled. With Fuzz off, the circuit is a clean boost with bass and treble. But if overdriven op-amp distortion is desired in addition to the Fuzz, keep IC1 as is but substitute one of the following for IC2. The OPA2156IDR dual CMOS op-amp IC will provide pleasing MOSFET distortion, while the NJM5532M dual BJT op-amp IC will provide distortion similar to that of a 12AX7 preamp tube. However, either of these choices comes with an audible increase in noise. Perform listening tests while breadboarding to determine if noise levels are unacceptable. Power-supply not shown. Requires a regulated dual-polarity DC supply providing +-9VDC or +-12VDC or +-15VDC at >= 40 mA of current. And while simulator verified, treat the circuit as experimental. Breadboard test before soldering.