Schottky Fuzz with 3-Band Tone PUBLIC

Schottky Fuzz Circuit with 3-Band Tone

Guitar pedal circuit-design using Schottky diodes for fuzz, plus a generic 3-band tone-control subcircuit. Controls include: Input Level, Fuzz enable switch, Fuzz symmetry switches, Fuzz Depth, Bass, Mid, Treble, Gain, and Volume. Caution! High-gain with all controls >= 50%. Example gains per frequency with all controls at 50%, and using a 1V p-p 1kHz input signal, are; -5dBV @ 25Hz, 0dBV @ 32Hz, +6dBV @ 40Hz, +13dBV @ 63Hz, +15dBV @ 82Hz, +17dBV @ 100Hz, +19dBV @ 250Hz, +20dBV from 400Hz to 1.6kHz, +19dBV @ 2.5kHz, +18dBV @ 4kHz, +16dBV @ 6.3kHz, +12dBV @10kHz, +7.5dBV @ 15kHz, +4.3dBV @ 20kHz. Maximum total circuit gain = +40dBV with all controls at 100% (not recommended except when breadboard testing; while using, keep control settings <= 75%) Circuit is ideal for 6/7/8-string guitars or 4/5/6-string basses, in standard tuning. Power-supply not shown. Requires a regulated dual-polarity DC supply providing one of the following; +-9VDC, +-12VDC, or +-15VDC. Count >= 3 mA of current per op-amp with the TL082CP. Substituting another op-amp may require different current (check op-amp's datasheet). Though verified, treat as experimental. Breadboard test before committing to soldered build. House completed project in a grounded metal enclosure, to prevent EMF interference.