Highly-Modified '97 Seely Preamp 2 PUBLIC

Highly-Modified '97 Seely Preamp 2 with 2-Voiced Fuzz

Guitar preamp based on circuit by Rodrick Seely from the article "Chrome Classic 50" guitar-amplifier in Popular Electronics mag., Dec. 1997, p34. However, I imposed many modifications, including adding an extra dual op-amp IC, altering circuitry, and changing part-values to get a preferred response curve. See the original circuit here: https://www.worldradiohistory.com/Archive-Poptronics/90s/97/PE-1997-12.pdf In this the 2nd version, Controls Include: Direct Level, Bass, Treble, Fuzz 1 enable switch, Fuzz 1 symmetry switches, Fuzz 2 enable switch, Fuzz 2 symmetry switches, Overdrive, and Fuzz Level. Range between high and low -3 dBV corners is from 20 Hz to 13 kHz, with emphasis on mids. Suitable for 6/7/8-string guitar and 4/5/6-string bass. Maximum gain = +21 dBV between 250 Hz and 630 Hz with all controls at 50%, or +26 dBV @ 1 kHz with only Level controls at 100% but all other controls at 50%. Maximum attenuation with both Fuzz effects ON is -3 dBV. Power-supply not shown. Requires a regulated dual-polarity DC supply providing +-9VDC or +-12VDC or +-15VDC at >= 40 mA of current. And while simulator verified, treat the circuit as experimental. Breadboard test before soldering.