Classic Feedback Fuzz PUBLIC

Classic-Sound Feedback-Diode Fuzz w. 2-Band Tone

RS-Timbre model "CF2B Fuzz". Classic-sounding feedback-type Schottky-diode fuzz circuit with 2-band tone. Direct signal is mixable with the fuzz signal. Fuzz is from Schottky diodes in a feedback-type array. Controls Include: Input Gain, Direct Level, Fuzz Drive, Fuzz Gain, Fuzz symmetry switches (two, with two settings each; for setting harmonic content of fuzz), Fuzz Level, Bass, Center, Treble, and master Volume. Frequency Range 80 Hz to 10 kHz with all controls at 50% but extends in both direction with all controls > 50%. Suitable for 6-string guitar only. Maximum Gain = 20 dBV @ 1 kHz with all controls at 50%, or up to twice that with all controls at 100%. For "vintage" fuzz, replace the Schottky diodes with germanium types (e.g., 1N34A), or normal fuzz use standard silicon (e.g. 1N4001), or bright fuzz use red LEDs (e.g., LTL-307E). IC1 chosen to ensure clean Direct signal at all control settings. IC2 chosen for classic sound. For more tube-like sound (similar to 12AX7 preamp tube), replace with an NJM5532M (Japanese version of NE5532N). For more modern JFET distortion, replace with TL082CP, or MOSFET distortion, replace with OA2156IDR. Circuit intended for stomp-box project but the battery can be replaced by a regulated single-polarity DC supply providing +9VDC or +12VDC or +15VDC at >= 40 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. And house in a grounded metal enclosure.