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Amplifiers: Audio Circuits
Amplifier -- Main Page          Audio Amplifiers Circuits -- Main Page

Audio Amplifiers:   #'s       A - D        E - M        N - R      S - U     
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Last Updated: October 24, 2017 02:54 PM

Circuits Designed by Dave Johnson, P.E. :
Improve the quality of standard TV images  -  I designed this circuit many years ago, based on the claims that the technique would improve the quality of standard TV images.  The circuit adds information to the edges of the objects and was reported to bring out more detail.  After building and testing . . . Hobby Circuit designed by David A. Johnson P.E.-July 08, 2000

Infrared TV/VCR Remote Booster  -  This circuit will boost the signal from any infrared TV or VCR remote, extending the range by a factor of 3X.   . . . Circuit by Dave Johnson P.E.-October 05, 2005

IR TV/VCR Remote Booster  -  This circuit will boost the signal from any infrared TV or VCR remote, extending the range by a factor of 3X.   . . . Hobby Circuit designed by David Johnson P.E.-October 05, 2005

Low Pass Filter, 3Khz, with an Audio Amp  -  This circuit uses a switched capacitor filter IC from National Semiconductor to filter signals with frequencies higher than the 3KHz needed for voice audio.  The schematic includes an audio amplifier that is designed to drive a standard audio head phone . . . Hobby Circuit designed by Dave Johnson P.E.-June 04, 2000

Microphone On/Off Switch Circuit is Pop Free  -  This circuit uses a simple technique to eliminate the usual “pop” sound when an electret type microphone is switched on or off.  The circuit is completely passive and will work on dynamic and electret type microphones . . . Hobby Circuit designed by Dave Johnson P.E.-February 15, 2002


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:


Four-Transistor Transmitter -  4 Transistor Transmitter __ Circuit + Parts Lits + Notes __ Designed by Paul C. Sherby

Full Duplex Audio Line -  This full duplex audio line circuit enables two audio signals in opposing directions to flow simultaneously through a common twisted pair line.  And it does that without complicated communication technology.  This technique called full duplex is not really new.  It is common in telephone technology.  However, the telephone uses a __ Designed by Popescu Marian

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

FXBus-an Effects Experimenter's Delight! -  Like to build guitar effects? Want a cleaner way to experiment than perfboarding each new one? You'll love FXBus __ Designed by © 1999 R.G. Keen

GAINCLONE -  Gainclone is a single integrated circuit based on an operational amplifier (op amp) on a single substrate of silicon.  The LM3875 is the "weapon of choice".  This great chip, is a little larger than the size of a thumbnail and can deliver up to 56W RMS continuous with 100W __ Designed by Michael LaLena

Gainclone 2x68 Watt Full Amplifier -  In this application, we are building a gaincard like amplifier.  This application type is named gainclone in audio world.  To take a satisfactory audio response, we are adding a Linkwitz equaliser to the feedback line and adding bass compensation also.  We are using LM3886

Gainclone Amp -  You read where the subjective reviewer tells of the equipment vanishing and revealing the music unfettered.  Well for the first time with any of mine or anyone else's gear that this is what I hear.  There are no speakers there is just the music.  A soundstage projecting from the wall behind __ Designed by Michael LaLena

Gainclone Amplifier -  GainClones have VERY few components and this one is based on the National Semiconductor LM3875 IC.  The PCBs and components are very simple and quick to make, only took about 20 mins to assemble both amps and rectifier board.  DC offset was about 80mV on one channel and about 40mV

GainClone Amplifier 1 -  The amp is based on the Project 19 PCB, so uses a pair of LM3876 (or LM3886) power opamps, run from a ±35V supply.  I used a cut-down P88 preamp PCB because I only wanted one preamplifier stage, but the entire board can also be used.  Alternatively, . __ Designed by Rod Elliott  ESP

Gainclone for the PC Age -  Audio input comes from either the Line-Out of the PC or an external sound card (described later).  A small filter consisting of 680Ω/47pF excludes any RF signals from entering the case.470nF input capacitor should have a high voltage rating since it protects against line voltages being connected to the amplifier, since it is in the signal path it should be a high quality type __ Designed by Malcolm Rix

GCSE Amplifier -  A really old project, although not the first amplifier I built by any means! It's not pretty inside, but it worked well for many years. __ Designed by Mark Hennessy

General Electric GEMLINK Information -  Overview of a General Electric GEMLINK K-band video transmitter. __ Green Bay Professional Packet Radio

Ginger -  The Ampeg SB-12 Portaflex adapted for use as a bass guitar distortion stompbox. __ Contact: holler @ runoffgroove.Com

Good IR Detector -  How to build a simple IR detector, schematics and alternate links __ Designed by DC Reagan

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

Gyrator Filter Design Info for Single Amp EQ -  The gyrator is used in place of the inductor in a LC filter __ Contact: info @ forsselltech . com

Hammonator 2RVT -  18 watt tube amp with reverb; adds pitch-shifting vibrato and tremolo __ Designed by G. Forrest Cook

Hammonator AO-14 Organ to Guitar Amp Conversion -  18 watt tube amp with reverb; adds pitch-shifting vibrato and tremolo __ Designed by G. Forrest Cook

Hammond AO-44 Reverb Amp to Hi-Fi Amp Conversion -  mono 6BQ5/EL34 tube amp __ Designed by G. Forrest Cook

Head phone Amplifier with BC239 -  Here is a simple head phone amplifier circuit that can be used to drive your head phone if your music player doesn’t have enough power to drive your head phones.  The circuit is straight forward and uses only three transistors.  

HeadBanger Headphone Amp -  After the euphoria over receiving my new Sony Minidisc bundle had partially subsided, I noticed that the portable unit, the MZ-E40, has a rather weak output.  Measurements showed that it can only manage 80mV rms output and only about 74dB SPL output from the phones.  This is when recording at average level with 8dB of headroom.  In contrast, an orchestra __ Stephen H. Lafferty

HeadBanger Headphone Amp Construction Kit -  After the euphoria over receiving my new Sony Minidisc bundle had partially subsided, I noticed that the portable unit, the MZ-E40, has a rather weak output.  Measurements showed that it can only manage 80mV rms output and only about 74dB SPL output from the phones.  This is when recording at average level with 8dB of headroom.  In contrast __ Designed by Stephen H. Lafferty

Headphone Amplifier -  An amplifier to drive low to medium impedance headphones built using discrete components __ Designed by Andy Collison

Headphone Monitor Amp -  Computer soundcards typically have line level and speaker level outputs.  Neither of those is usually nott very suitable for driving headphones: If you connect the headphones to the line level output you will usally loose tha bass frequencies because of small coupling capacitors.  Line output circuitry might be overloaded because of too low input impedance and this can cause distortion __ Designed by John Simonton

Headphone Monitor Amp -  Computer soundcards typically have line level and speaker level outputs.  Neither of those is usually nott very suitable for driving headphones: If you connect the headphones to the line level output you will usally loose tha bass frequencies because of small coupling capacitors.  Line output circuitry might be overloaded because of too low input impedance and this can cause distortion __ Designed by John Simonton


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Audio Amplifiers:   #'s       A - D        E - M        N - R      S - U        V _ Z

 


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