Split-Supply Preamp 3 PUBLIC

Guitar Preamp/Booster with 2-Voiced Fuzz and 3-Band Tone

Guitar preamp/booster with 2-voiced diode fuzz and 3-band Fender-style tone-stack. Controls Include: Attenuation switch, Attenuation control, Fuzz Enable switch, Fuzz Type switch (2 selections, Normal or Smooth), Fuzz symmetry switches (two per voice), Drive, Bass, Mid, Treble, Stack Sum, Gain, and Volume. Suitable for stomp-box or rack-mount applications, though the batteries can be replaced by a regulated dual-polarity DC supply providing +-9VDC or +-12VDC or +-15VDC at >= 20 mA of current. Frequency range is from 25 Hz to 10 kHz with all controls at 50%. Maximum gain with all controls at 50% is +21.5 dBV @ 250 Hz, or nearly twice that with all controls at 100%. And though simulator verified, the circuit should be considered experimental. Breadboard test it before committing to a soldered build.