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Amplifiers: Audio Circuits
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Audio Amplifiers:   #'s       A - D        E - M        N - R      S - U     
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Last Updated: December 30, 2017 02:09 PM

Circuits Designed by Dave Johnson, P.E. :
Audio Amp + 3Khz Filter  -  This circuit is the audio amp section for a complete optical transmitter.  The circuit amplifies and filters the voice audio signals from an electret microphone.  The circuit is described in more detail in . . . Circuit by David Johnson P.E.-June 04, 2000

Band Drummerís Microphone Switch  -  I received an email from guy who plays drums for a small band.  He wanted a simple way to turn on and off his microphone with just a tap of his drum stick onto a small box.  The circuit below performs this task with the aid of a piezo device as a shock sensor and a small dual coil latching relay with two sets of contacts.  The contacts can be wired any number of ways to a microphone circuit . . . Hobby Circuit designed by David A. Johnson P.E.-October 16, 2011

Boost Infrared TV/VCR Remote Signal  -  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 Dave Johnson P.E.-October 05, 2005

DVD Recorder + TV Camera Make Cheap Data Logger  -  Sometimes recording the results of a test requires as much ingenuity as designing the product.  Consider a situation which requires the collection of many different variables over a long period of time . . . Hobby Circuit designed by David A. Johnson P.E.-April 01, 2005

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

Build a Stereo Headphone Amplifier -  It's based on a single IC and can be used with RIAA   (turntable) preamp described in our March 2002 issue   (or anything else) __ SiliconChip

Build a Stereo Synthesizer -  There are many ways to create a stereo effect.  If you were miking a piano, a string section, or some other large sound source, you'd probably stick up a pair of directional mikes and assign them left and right.  But what if you want to "enlarge" a lead vocalist? . __ Designed by Ethan Winer

Build a Tape Linearizer & a Distortion Analyzer -  No sane recording engineer would ever add distortion to a program intentionallyunless, of course, the goal was to increase headroom and lower tape distortion.  No, I'm not talking about a new type of "sonic exciter," but a well-known and accepted method to counteract the onset of saturation in analog recording tape. __ Designed by Ethan Winer

Build a Theremin for a Really Eerie Sound -  You wave your hands around mysteriously to play it. __ SiliconChip

Build a Two Channel Signal to Noise Voter -  As hand-held transceivers   (H-Ts) become smaller, and low power, battery conserving operation becomes more popular, the disparity between the transmitting range of a typical 100 watt repeater compared to the repeater accessing range of a typical 1 watt or less H-T becomes more and more apparent.  How often have you found it difficult   (or impossible) to access a repeater with a low power H-T even though you can hear the repeater at full quieting? This can happen even if the repeater is equipped with a high sensitivity, state-of-the-art receiver. __ Designed by Mark Kolber  WB2WHC

Build the Bass Blazer -  It gives a visual readout of the bass signals from your home theatre or car stereo system on four bargraph displays __ SiliconChip

Build the Ultra-LD 100W Amplifier Module: Part One -  This 100W class-AB amplifier module has ultra low distortion. __ SiliconChip

Build Your Own Ball Bearing Beat Box -  Ubercool light show for any DJ. __ Contact: Jameco Electronics

Build Your Own Compact Bass Reflex Loudspeakers -  Would you like to build some high quality speakers and don't mind doing some enclosure assembly finishing? These M6 compact bass reflex systems from theloudspeakerkit.com could be just what you are looking for.  Use them on stands or on a bookshelf. __ SiliconChip

Build Your Own MP3 Jukebox Pt.1 -  Here's a fantastic way to play your MP3's.  It's based on a PC and features infrared remote control and an LCD to display track titles. __ SiliconChip

Build Your Own MP3 Jukebox Pt.2 -  Play all your favourite music by remote control __ SiliconChip

Building a Champ guitar Amp made out of Junk Parts -  As you see from the above circuit, this is a fairly simple circuit and take note that this one uses a tube rectifier in the power supply. __ Designed by Jon Tirone, AKA John Fisher

Building a Musical Sunrise Quartz Alarm Clock -  For the past twenty years, Iíve been using an LED digital alarm clock-radio   (which I won as a door prize at a model airplane gathering in 1995) to wake up in the morning.  In recent years, Iíve found that the large glowing red digits disturb my   (and my wifeís) sleep, and felt it was time for something new __ Designed by Stepan Novotill

Building the Ultimate Jukebox -  Last month we looked at what we wanted in the Ultimate Jukebox.  Now let's start building it __ SiliconChip

Building the Ultimate Jukebox; Pt 1 -  In the days of IPods, MP3 players and all manner of fit-in-your-pocket, "music on the go" devices, why on earth would anyone want to build a freestanding jukeboxwhich, by definition, is almost a piece of furniture? __ SiliconChip

Building the Ultra-LD 2x100W Stereo Amplifier -  Pt.2; Building the preamplifier, RCA input and power amplifier modules, plus all the performance details. __ SiliconChip

Building the Ultra-LD Stero Amplifier: Part Two -  It fits nicely inside an ATX computer tower case, complete with a fan-cooled tunnel heatsink plus selector switch and volume control. __ SiliconChip

Canary Sound Effect -  An electronic version of a chirping canary.  May be used as an alarm, a sound effects generator or perhaps a replacement doorbell __ Designed by Andy Collinson

Chanting Player -  Chanting combines singing and music with mantras.  The sweetness of chanting stills the mind, dissolves worries and opens the heart.  Chanting forms an integral part of the practice schedule at siddha __ Electronics Projects for You

Cheap 100 to 150 Watt Amp -  Here is a simple and cheap amp to make

Cheap Audio Booster -  Circuit only, no description given __ Designed by YMYA electronics-IZHAR FAREED

Cheap DSP Experiments -  Digital signal processing experiments with only a cheap 8bit microcontroller.  This project experiments on Delay, Echo, Pitch Conversion, Filter and etc. __ Designed by The Electronic Lives Manufacturing-presented Chan

Chord EGG 2015: Remaking a PAiA Classic -  The Stereo Chord EGG was a novel little circuit introduced in kit form by PAiA in 1976 as an interesting application of a top octave generator IC.  This chip, which was state-of-the-art at the time, generated a whole octave plus one note (C8 to C9) on its 13 outputs from a single high frequency input (2MHz). __ Designed by Stefan Vorketter

Chu Moy Headphone Amp -  This is a Chu Moy headphone amp I made.  I got the PCB design from Guzzler from Head-Fi and the original design is very popular and is here.  I changed Guzzler's layout so I could use a Taiwan Alpha pot on the PCB.  These pots a high quality (some say better than ALPS blue velvet) and are available from Jaycar.  You can see the thread here.  I also made a DIY Brown dog adapter so I could use two OPA627 single opamps in a dual opamp socket.  

Church Bell Controller -  This circuit is a church bell controller.  Basic component is an ATmega32 microcontroller.  At the circuit 2 24LC32 eeprom memories is being used, the 1st for internal standard melodies and the 2nd one is for user's compositions.  This feature will be provided in the future __ Designed by Antonis Pontikakis

Circuit Combines Power Supply & Audio Amplifier -  20-Dec-01 EDN-Design Ideas The circuit in Figure 1 can help if you must transfer dc power and audio over a pair of copper wires.  One application for such a circuit is a low-cost door-opening system with speech input.  The circuit uses only one IC, the well-known LM317, a low-cost power-supply regulator.  Using this chip, you can modulate the adjustment-pin input with the audio signal from an electret condenser microph __ Circuit Design by Susanne Nell, Breitenfurt, Austria

Circuit controls brightness of multiple displays -  05/30/02 EDN-Design Ideas I recently needed to control nine seven-segment displays for a microcontroller's serial port.  The complication I faced was the need to provide a continuous brightness adjustment for all the digitsófrom completely dark to fully bright.  I couldn't easily use the obvious solution of a string of 74HC595 serial-to-parallel converters driving the segments through series resistors, because I wou __ Circuit Design by Stephan Goldstein, Analog Devices, Wilmington, MA

Circuit diagram for 8 watt audio Amp -  Here is the schematic for an 8 watt audio amp.  This amp can be used as a simple booster, the heart of a more complicated amplifier or used as a guitar amp. __ Designed by Aaron Cake

Circuit Emulates Mechanical Metronome -  08/19/99 EDN-Design Ideas The circuit in Figure 1 produces timing signals with a sound like that of a mechanical metronome. IC 1 is a 555 timer that oscillates at approximately 3200 Hz.  The two 3-kW resistors and the 0.047-ĶF capacitor set the frequency. IC 2 divIdeas the frequency of IC 1 's output by 2. IC 2 produces a square wave with an exact 50% duty cycle. __ Circuit Design by Jim Kocsis

Circuit Incorporates Mixing andAmplifying Functions -  10-Jul-08 EDN-Design Ideas Using an amplifier with a power-down disable, you can combine the mixer and the amplifier functions __ Circuit Design by Guus Colman, Guy Torfs, Johan Bauwelinck, and Jan Vandewege, INTEC/IMEC, Ghent University, Ghent, Belgium

Circuit to Connect Telephone Equipment to Audio Mixer -  I have used this type of circuits for quick testing of telephone equipment.  This is a quick hack that does not exactly resemble the characteristics of the real telephone network, but is enough for this kind if applications.  If you want better simulation, change the resistor to 600 ohm and increase the power supply voltage.  And by the way __ Designed by Tomi Engdahl

Clack Clack Electronic Bell -  This is a very simple electronic bell.  Here the transistor TR-1 acts as a low frequency oscillator.  Transistor TR1 also acts as a pre-amplifier.  Oscillations generated from TR-1 is fed to the transistor TR2 which is a small audio amplifier.  Preset Vr1 can be used to vary frequency, which will change the output tone of the bell. __ ` Sigmatone

Clap Switch -  A clap switch circuit is a classic beginnerís project.  Equipment can be switched on and off by just clapping your hands.  Add a tiny microcontroller and you can easily build-in some more useful features.  The microcontroller in this circuit makes it a simple job to add some useful features that are not seen on other clap switch __ Designed by Popescu Marian

Clara Guitar Amplifier -  Pure Class-A Single-ended circuitry; 2W Power, Valve-like operation __ Contact: Flavio Dellepiane, fladello @ tin.it

Class a JFET Opamp Circuit -  First Generation design that means it is not our latest design __ Contact: info @ forsselltech . com

Class a Power Amplifier Notes -  These notes have evolved as a result of my long-time interest in both Hi-Fi music equipment and modern electronics.  I am a keen audiophile, electronics DIYer and perfectionist, this mix constantly keeps me going.  The page serves mostly as a memo that holds my working notes.  However __ Designed by Leo Bodnar

Class A//A-B 100W Amplifier -  A Class A // Class AB amplifier rated 100 Watts when driving a 4 ohm loudspeaker. __ Designed by Graham Maynard

Class A2 SE 812A Amp -  This Amp is a variation on the SE 826 amp, below.  It uses positive grid bias derived directly from the cathode follower driver stage.  The 6F8-G driver/input tube was chosen because it biases to the required voltage (+14V) for the output stage's bias.  (Note that the 6F8-G can be replaced with a 6SN7.  I just happen to like the looks of the 6F8-G better) __ Designed by Bob Danielak

Class A2 SE 812A Amp power supply -  This is the power supply for a Class A2 812A Amp __ Designed by Bob Danielak

Class A2 SE 826 Amp -  The schematic for the SE 826 amp.  This Amp was an attempt to create a nice Class A2 power amp, similar to the SE 833 amps, described below, but without a 10:1 step-down transformer.  Instead, it uses a choke-loaded cathode follower to drive the output tube.  It uses positive grid bias derived directly from the cathode follower driver stage.  The 6F8-G driver/input tube was chosen because it biases to the required voltage (+14V) for the output stage's bias.  (Note that the 6F8-G can be replaced with a 6SN7.  I just happen to like the looks of the 6F8-G better) __ Designed by Bob Danielak

Class A2 SE 833 Stereo Amp -  The schematic for the SE 833A amp is shown HERE. __ Designed by Bob Danielak

Class A2 SE 833 Stereo Amp Power Supply -  The schematic for its power supply is shown HERE. __ Designed by Bob Danielak

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

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