Five band graphic equalizer:  This circuit uses a single chip, IC BA3812L for realizing a 5 band graphic equalizer for use in hi-fi audio systems.The BA3812L is a five-point graphic equalizer that has all the required functions integrated onto one IC. The IC is comprised of the five tone control circuits and input and output buffer amplifiers. The BA3812L features low distortion, low noise, and wide dynamic range, and is an ideal choice for Hi-Fi stereo applica-tions. It also has a wide operating voltage range (3.5V to 16V), which means that it can be adapted for use with most types of stereo equipment.
The five center frequencies are independently set using external capacitors, and as the…. (added 10/05)

Four Channel fuzz Box:  (electronic circuit added 4/05)

Fuzz-box:  All-FET design.  Valve-like distortion behavior (added 3/05)

Guitar "Direct Box":  Hang this on your Fender Twin or other guitar amp and feed your sound directly into a mixing board or PA. (circuit design added 7/06)

Guitar "wah-wah" Effect:  A fairly high-Q bandpass filter design with cutoff frequency controlled by a foot-operated potientiometer. The poles of the filter are designed for the guitar spectrum. Single-supply operation and low-noise make it a cool toy. (circuit design added 7/06)

Guitar Amplifier 10 Watt:  Old-Style ultra-compact Combo2-inputs-Overdrive-Treble-enhancement (added 4/05)

Guitar Control:  CaStand-alone, 9V battery powered unit .  Three-level input selector, three-band tone control  (added 3/05)

Guitar Effect Circuit (aaroncake):  Wah, Fuzz and sustain  (added 4/05)

Guitar Effect Circuit (ee.washington.edu):  (electronic circuit added 4/05)

Guitar Reverb Circuit:  (electronic diagram added 6/03)

Guitar Reverb Pedal:  (electronic circuit added 2/07)

Guitar Reverb Pedal:  (electronic circuit added 4/05)

Guitar Tremolo Unit:  (electronic Schematic added  03/05)

Guitar Tremolo Unit:  (schematic / circuit added 2/07)

Guitar Vibrato Unit:  (electronic design added 9/02)