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Fender Princeton adapted for use as a distortion stompbox - One of the often overlooked Fender amps is the tweed-era Princeton. They are excellent guitar amps, especially for blues playing. The major drawback was the 4.5 watt output wasn't enough to keep up with a band. Again, using the technique pioneered by Doug Hammond, we decided to try to capture some of the sound of this little amp in pedal form so it can be used with a band. __ Contact: holler @ runoffgroove.Com
FET Input High Speed Light Detector - This circuit is yet another design that converts current from a PIN photo diode to a voltage. It has a bandwidth that extends beyond 50MHz. . . Circuit by David Johnson P.E.-June, 2000
Fetzer Valve - In the two years since the Fetzer Valve was first published in the midst of our adaptation of tube amps for use as distortion pedals, the circuit has enjoyed popularity as a standalone booster and as a building block in larger circuits. While the circuit has its merits, we decided to further explore it to determine if it was a truly faithful solid-state version of the familiar input stage used in many tube amps. __ Contact: holler @ runoffgroove.Com
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, .
Flipster - When one thinks of classic bass amps, the brand name "Ampeg" often comes to mind. Their SVT models were very popular and still are today. Slightly less known Ampeg combo-type models were also made, called "Portaflex" amps. In "travel" form, these appeared to be simple closed back speaker cabs with a pair of chrome latches on either side of the top panel. When one released the latches, the top panel could be removed and flipped over to reveal a tube head unit. One simply plugged in the attached speaker cable and the amp was ready to go. The unique design led to the nickname of "Flip Tops." __ Contact: holler @ runoffgroove.Com
Foldback Loudspeaker System for Musicians - It uses readily available drivers and can be built using basic hand and power tools. __ SiliconChip
Form Push-Pull Driver using N-Ch & P-Ch Transistors - This circuit can produce high speed output signals with fast rise and full times. The unique change pump action allows the voltage of the upper P-ch device to range from millivolts to hundreds of volts. The output current is only limited by the rating of . . . Hobby Circuit designed by David Johnson P.E.-June, 2000
Four channel power Amplifier with bi-amping & bridging options - After building the Micro-Amp, I was not only impressed with the performance of the LM4780, but also felt ready to tackle a more ambitious metalwork project. This is the result: four channels, with options for bi-amping and bridging. __ Designed by Mark Hennessy
Four-Watt AF Amplifer - I have recently included a page about AF amplifers for use with Homebrew rigs. In this I mentioned that I may include a practical one-watt circuit, complete with PCB foil and layout. Here it is, but I have taken the liberty of engineering it to provide 4-watts of AF output and with a frequency response almost suitable for Hi-Fi applications __ Designed by Harry Lythall-SM0VPO
Fuzz-box - All-FET design; Valve-like distortion behavior __ Contact: Flavio Dellepiane, fladello @ tin.it
FuzzniKator Push-Pull Tube Distortion/Preamp - improved tube distortion project __ Designed by G. Forrest Cook
Fuzzy Firebottle Guitar Distortion Pedal - single-ended tube distortion __ Designed by G. Forrest Cook
Gain 1000 Amplifier with 0.01% Accuracy, DC to 5Hz - With a typical open loop gain value of 20 million V/V, very high closed loop gain amplifiers can be implemented with remarkable accuracy. Even with such a high gain, the trimmed precision produces a dc output offset of only 20mV. __ Linear Technology/Analog Devices App Note, Jun 21, 2011
Gainclone Power Amplifier - This is a basic design with a single LM3875TF chip per side, and one shared toroidal transformer. I will be making two of these amplifiers simultaneously but with a few critical component differences. One is based on standard components, and one on premium components. There was a lot of deliberation on the
Ginger - The Ampeg SB-12 Portaflex adapted for use as a bass guitar distortion stompbox. __ Contact: holler @ runoffgroove.Com
Grace / Big Daddy - A few months ago, Aron Nelson released the Smash Drive. The circuit ingeniously used an LM386 audio power amp chip to produce great distortion sounds. Aron based his work on that of Tim Escobedo. Tim's Stupidity Box was another great sounding unit and beautifully simplistic. The Smokey Amp by Bruce Zinky was another design that used a 386 for some great sounds. __ Contact: holler @ runoffgroove.Com
Guitar & Bass Sustain - A simple, low distortion limiter for musical instruments __ Designed by Rod Elliott ESP
Guitar & Microphone Amplifier using TDA2005M - This simple audio power amplifier works with guitars and microphones, delivering an output power of around 20W over a load of 4 ohms. The amplifier circuit is built around IC TDA2005M and __ Electronics Projects for You
Guitar Amplifier 10 Watt - 10W Old-Style ultra-compact Combo; Two inputsOverdrive Treble-enhancement __ Contact: Flavio Dellepiane, fladello @ tin.it
Guitar and Microphone Amplifier Using TDA2005M - This simple audio power amplifier works with guitars and microphones, delivering an output power of around 20W over a load of 4 ohms. The amplifier circuit is built around IC TDA2005M and
Guitar Cable Tester - Here is a device that musicians will find highly useful. It will detect breaks or shorts in a guitar or monitor cable. Much more elaborate cable testers are available at music stores, but they are fairly complex and are mostly useful to road crews and t __ Designed by Andrew R. Morris
Guitar Control - Stand-alone, 9V battery powered unit; Three-level input selector, three-band tone control __ Contact: Flavio Dellepiane, fladello @ tin.it
Guitar Effect - Fuzz is one of the classic guitar effects, and this simple circuit generates it quite well. The circuit is so compact that it can be built into guitars or amps that do not have built in fuzz to add that capability to the instrument. The circuit does not use much battery power, so a standard alkaline battery will last many years even with daily use. __ Designed by Aaron Cake
Guitar Effect Pedal Power - A friend of mine plays guitar with several guitar effect pedals. He had a problem with battery eliminators and cables of the pedals cluttering the stage and so he asked for __ Electronics Projects for You
Guitar Fuzz Box - Fuzz is one of the classic guitar effects, and this simple circuit generates it quite well. The circuit is so compact that it can be built into guitars or amps that do not have built in fuzz to add that capability to the instrument. The circuit does not use much battery power, so a standard alkaline battery will last many years even with daily use. __ Designed by Aaron Cake
Guitar Jammer for Practice & Jam Sessions - Build it and jam along with your favourite CD, or use it to practice without disturbing others. __ SiliconChip
Guitar Reverb Effect Version 2 - This is my second-generation guitar reverb circuit. The fidelity is much improved over the earlier design, it is suitable for use as a front-end to a guitar amplifier. This circuit features clipping indicators on the preamp and reverb recovery stages, allowing for the optimal gain settings __ Designed by G. Forrest Cook
Guitar Reverb Pedal - This is a circuit for a guitar spring reverb pedal, it has dry, wet, and drive controls for a wide variety of sounds. With a decent reverb spring (tank) in overdrive, this circuit will produce an incredibly thick and grungy sound, build one and be the envy of all of your guitar playing friends. This thing is fun to play through __ Designed by G. Forrest Cook
Guitar Spring Reverb Unit - A high performance spring reverb unit for guitar amps __ Designed by Rod Elliott ESP
Guitar Tremolo Unit - A versatile guitar effect. This is a simple circuit that gives very good results __ Designed by Rod Elliott ESP
Guitar Vibrato Unit - A reasonably simple circuit, with results similar to the Vox AC30 guitar amp __ Designed by Rod Elliott ESP
Guitar Vibrato Unit 1 - A reasonably simple circuit, with results similar to the Vox AC30 guitar amp __ Designed by G. Forrest Cook
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