RO Wailinator III: Fuzz with 3-Band Tone PUBLIC

3-Voice Fuzz with Op-Amp Distortion and 3-Band Tone

3-voice diode fuzz circuit with op-amp distortion and 3-band Fender-style tone-stack. Controls Include: Gain 1, Fuzz 1 enable switch, Hi-Cut, Drive, Bass, Mid, Treble, Gain 2, Fuzz 2 enable switch, Fuzz 3 enable switch, and Volume. Employs two dual op-amp ICs to obtain two nearly identical 2-stage fuzz circuits involving diode arrays; one symmetric feedback array using LEDs, one asymmetric feedback array using ordinary silicon diodes, and one asymmetric shunt-type array using Schottky diodes. IC1 was chosen to ensure clean operation of the input stage with Fuzz 1 disabled. IC2 was chosen to provide tube-like distortion when overdriven, in addition to Fuzz 2 and Fuzz 3. Frequency Range 18 Hz to 18 kHz with all controls at 50%. Suitable for 6/7/8-string guitar or 4/5/6-string bass. Example Gains per Frequency with all controls at 50%; -3 dBV @ 18 Hz, +25.4 dBV @ 100 Hz, +24.8 dBV @ 400 Hz, +23 dBV @ 1 kHz, +20 dBV @ 4 kHz, +8 dBV @ 10 kHz, and -3 dBV @ 18 kHz. Gains can be up to twice these values with all controls at 100%, at which bandwidth increases in both directions. Power-supply not shown. Requires a regulated dual-polarity DC supply providing +-9VDC or +-12VDC or +-15VDC at >= 40 mA of current. [Tip: Higher supply voltage results in lower op-amp noise.] And though simulator verified, treat the circuit as experimental. Breadboard test before soldering. Note: The sound should be similar to that from an Ibanez TS-9 Tube Screamer and a Boss OD-1 Overdrive in series.