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Last Updated: November 30, 2017 07:38 AM


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

El-Cheapo -  This is the real El-Cheapo, presented in more or less original form.    A Really Simple Power Amplifier. __ Designed by Rod Elliott  ESP

Electret Microphone Powering -  This document is a collection of information and circuits for powering electret microphone capsules.  This document is written for people who understand the basics of microhone circuits. __ Designed by Tomi Engdahl

EPROM Sound player using counter & homemade R2R DA-Converter -  The sound data is made on a PC using 8Bit RAW format, the 64Kbit 27C512 EPROM can hold several seconds of good sounding music or 20 sec of speach, the two 4040 addresses the 16bit EEPROM and is clocked by the variable RC osc made in a 4093.   The 8Bit data from the EPROM is buffered by a 54ALS574 then the R2R net converts the digital stream into audio, __ Designed by Thomas Scherrer OZ2CPU

ESP SIM Sound Impairment Monitor -  The smallest variation in amplifier performance is shown with this simple circuit __ Designed by Rod Elliott  ESP

Fast Audio Peak Limiter -  This peak limiter is simple and very effective.    Uses discrete FET gain control __ Designed by Rod Elliott  ESP

FET audio mixer -  This simple circuit mixes two or more channels into one channel   (eg.  stereo into mono).  The circuit can mix as many or as few channels as you like and consumes very little power.  The mixer is shown with two inputs, but you can add as many as you want by just duplicating the "sections" which are clearly visible on the schematic. __ Designed by Aaron Cake

Four Channel, 12 Volt Color Organ for a Car -  Back in the 1970's these were popular for use in homes and the colored bulbs were typically place in a box with a sheet of "rippled/bubbled" Plastic in front to break up the light patterns.  Some units gave very impressive light patterns. __ Designed by G.L. Chemelec

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 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

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 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 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 1 -  A reasonably simple circuit, with results similar to the Vox AC30 guitar amp __ Designed by G. Forrest Cook

Head phone Amplifier with BC240 -  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 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 <steve @ tesoft.com>

Headphone Adaptor -  A simple adaptor to provide a headphone output to an existing power amplifier __ Designed by Rod Elliott  ESP

Headphone Amplifier -  In the fall of 2001, I have built one of the Stor designs: a single-ended class A headphone amplifier with only three transistors per channel: one BC109 (voltage amplifier with local negative feedback) and two 2N3055s (modulated current source).  At first, I thought that this circuit could hardly sound good.  However, simulations indicated low THD.  Moreover, the harmonic spectrum was nice: mainly second and relatively few and weak higher-order components.  A tube-like spectrum, in my opinion a good thing ! This encouraged me to give the circuit a try __ Designed by Aren van Waarde

Headphone Amplifier -  Can be directly connected to CD players, tuners and tape recorders. __ Contact: Flavio Dellepiane, fladello @ tin.it

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

Headphone driving for soundcards -  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 Tomi Engdahl

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

hFE Tester -  An hFE tester with switched collector currents for the Device Under Test __ Designed by Rod Elliott  ESP

Hi-Fi Headphone Amp -  The intention is to permanently insert the headphone amp between pre and power amps, although it can be used as a stand-alone item.  The input relay is operated by auxiliary contacts on the headphone sockets through a transistor driver (with a small delay) so as to mute the power amp input when listening on headphones __ Designed by Rod Elliott  ESP

Hi-Fi Headphone Amplifier -  The intention is to permanently insert the headphone amp between pre and power amps, although it can be used as a stand-alone item.  The input relay is operated by auxiliary contacts on the headphone sockets through a transistor driver (with a small delay) so as to mute the power amp input when listening on headphones. __ Designed by Richard Crowley

Hi-Fi Headphone Amplifier -  Can be directly connected to CD players, tuners and tape recorders.  * Tested with several headphone models of different impedance: 32, 100, 245, 300, 600 & 2000 Ohm.  * Old 8 Ohm impedance headphones can be also driven, but these obsolete devices are not recommended.  * Schematic shows left channel and power supply (common to both channels).  * Numbers in parentheses show IC1 right channel pin connections.  * A correct grounding is very important to eliminate hum and ground loops.  Connect to the same point the ground sides of J1, P1, C2, C3 & C4.  Then connect separately the input and output grounds to the power supply ground. __ Designed by Richard Crowley

High Quality Intercom -  A very high quality intercom, which may also be used for room monitoring __ Designed by Andy Collison

High-Performance Stereo Headphone Amplifier, Pt.1 -  If you can't afford a high-performance amplifier and loudspeakers, you can still have the best possible hifi sound, with this headphone amplifier and a set of high-quality headphones.__ SiliconChip

High-Performance Stereo Headphone Amplifier, Pt.2 -  Last month we introduced our new Hifi Headphone Amplifier which features very low distortion and noise.  It can even drive efficient 8-ohm speakers.  This month, we show you how to build and test it.__ SiliconChip

High-resolution volume-unit meter simplifies CD recording -  EDN-Design Ideas 06/21/01    Digitally recorded music on CDs offers superior quality to that recorded on vinyl records or tape, but most prerecorded CDs have an annoying characteristic: The average volume levels of the recorded signal can vary by as much as 14 dB from disk to disk.  Significant variances, such as 4 dB, can occur from track to track on a single CD. __ Circuit Design by Chester Simpson, National Semiconductor, Santa Clara, CA

Home Theater -  PIC Project  This unit is designed to interface: TV sound, videotape sound, and 5.1 dvd sound to a 4 channel home theater system. __ Designed by Luhan Monat-Mesa Arizona


Audio Accessories:   #-A       B - D       E - H       I - P        R - S       T - Z


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