RO Wailinator II: Fuzz with 2-Band Tone PUBLIC

2-Voice Fuzz with Op-Amp Distortion and 2-Band Tone

2-voice feedback-diode fuzz circuit with op-amp distortion and 2-band Fender-style tone-control circuit. Controls Include: Gain 1, Fuzz 1 enable switch, HiCut1, Drive, Bass, Treble, Gain 2, Fuzz 2 enable switch, HiCut2, and Volume. Employs two dual op-amp ICs to obtain two nearly identical 2-stage fuzz circuits involving feedback type diode arrays; one symmetric using LEDs and one asymmetric using ordinary silicon 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. 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. Ganis 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 like that from an Ibanez TS-9 Tube Screamer and Boss OD-1 Overdrive in series.