Bass Fuzz with Compression PUBLIC

Bass Fuzz Circuit with Compression and 2-Way Tone

Bass fuzz circuit with compressor and single-knob 2-way tone-control. Uses two dual FET-input op-amps for gain, one BJT transistor and one FET for compression, and eight Schottky diodes for fuzz. Controls Include: Input Gain, Fuzz enable switch, Fuzz symmetry switches (two, with two settings each; for setting harmonic content of fuzz), Fuzz Depth, Compression control, Tone control (bass counterclockwise, full-range middle, treble clockwise), Output Gain, and Volume. Frequency range at or above 0 dBV is from 16 Hz to 6.3 kHz with all controls at 50% but extends in both directions with all controls > 50%. Suitable for 4/5/6-string bass-guitar, or 7/8-string guitar (with emphasis on lows). [Not recommended for 6-string guitar except where boosted lows are desired.] Maximum Gain = +35.8 dBV @ 100 Hz, falling to +13.6 dBV @ 1 kHz, with all controls at 50%, and up to twice that with all controls at 100%. [Do not use with all controls at 100% except as worst-case test while breadboarding.] With fuzz off, circuit is a high-gain Bass Overdrive. Rack-mount implementation is suggested. Power-supply not shown. Requires regulated dual-polarity DC supply providing +-9VDC or +-12VDC or +-15 VDC at >= 50 mA of current. [Note: Higher supply voltage results in lower op-amp noise.] And though simulator verified, treat the circuit as experimental. Breadboard test it before committing to a soldered build. House in a grounded metal enclosure.