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Audio Circuits:  Power Amplifiers
Audio Circuits -- Main Page

Audio Power Amplifiers:   #'s - A       B - E      F - L      M - R      S - Z

Last Updated: October 09, 2017 03:39 PM

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



A Weighting Filter for Audio Measurements -  For noise measurements.  Ideal for use with the AC Millivoltmeter above __ Designed by Rod Elliott  ESP

A/V Sender -  This small circuit transmitter processes the signs of audio of a sound table or microphone, and the signs of video of a camera, or still the audio signs and video of a DVD, Video-cassette or even it sweats her video plate has an exit of composed video, you can transmit direct of your computer.  Playing them in a channel free from the strip of VHF __ Designed by Toni on Aug 19, 2009

Active HiFi speakers -  A pair of large three-way speakers with built-in active cross-over and expanded class-A amplifiers, exhibiting very high sound quality, while being neither hard to build, nor expensive.  Schematic diagram, printed circuit board layout, and several photos are included. __ Designed by Manfred Mornhinweg

Active Subwoofer & Controller -  Designed to operate a sub-woofer driver below its resonant frequency __ Designed by Rod Elliott  ESP

Add Simple Circuit disable function to a panoramic-potentiometer -  02/15/07  EDN-Design Ideas Improved control circuit places monaural image in a stereo field__ Circuit Design by Lawrence Mayes, Malvern, United Kingdom

AF Pre-amp for Kenwood Mc-50 microphone to improve high frequency responce (high emphasis) -  Ham RadioSchematic __ Designed by Guy Roels ON6MU

AGC Amplifier (“Another Gain Clone”) -  My junkbox contains several NOS chip amplifier ICs   (TDA2003, TDA2030, TDA7262, TDA7296, LM386 and LM675T).  After a prolonged stay in the attic, I thought I should do “something” with them.  Mother Maria insisted that a stereo set should be built for son Henk who has left the home and is a student of mathematics at Groningen University.  Initial attempts at building a small stereo amplifier with TDA2030 ic’s were not very successful.  The amp worked __ Designed by Arenvvan Waarde

Altec 1566A:Vacuum Tube Preamp & Direct Box Project -  There are all sorts of tube circuits, some of which actually deliver The Sound people associate with Vacuum Tubes.    Did you know, for example, that asymmetrical distortion generates even-order harmonics while symmetrical distortion produces odd-order harmonics?  Neither vacuum tubes nor transistors are exclusively responsible for either type of distortion, it’s really about Circuit design

Amp based on a Silvertone Twin Twelve -  ampbased upon an old Silvertone Twin Twelve -- I decided to try another guitar amp   (actually, I intend to build two identical single 12" combo'sone for me and one for my TWIN brother, Rich).  Although I'm sure a Fender Deluxe knock-off would be just fine for what I needed , I wanted to do something a bit different __ Designed by Bob Danielak

Amplifier -  This is the low frequency power amplifier of which the penumbra article can be composed without using it hardly.  The about 660-mW output can be gotten with the 16-ohm speaker.   This circuit is used for the simple monitor and so on __ Designed by Seiichi Inoue

Amplifier based on LM4780 including a thermal shutdown feature -  Audio power amplifier circuit diagrams / circuit schematics __ Designed by Mark Hennessy

Audio Amp -  The audio amplifier shown below provides 14 watts of power, but can provide much more simply by increasing the power supply voltage.  This amp was built in 1975 and has worked reliably ever since.  The power amp portion was published in Popular Electronics in the mid-1975s.  I added a preamp and bass and treble controls.  This amp has extremely low distortion and is relatively insensitive to the choice of components. __ Designed by Michael Ellis

Audio Amp Based on LM383 8 Watts -  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

Audio Amp Output Power Limiter -  If you hire out audio equipment, or just don't want the kids to blow up your speakers when you are not home, this is the project for you.  It is a very simple little project, but will protect the speakers from being overdriven.  Any attempt at overdrive will simply cut the amp gain backthe more overdrive, the more the input signal is reduced. __ Designed by Rod Elliott  ESP

Audio Amplifier Output Relay Delay -  This is a simple circuit which I built to one of my audio amplifier projects to control  speaker output relay.  The purpose of this circuit is to control  relay which turns on  speaker output relay in  audio amplifier.  The idea of  circuit is wait around 5 seconds after  power up until  speakers are switched to  amplifiers __ Designed by Tomi Engdahl

Audio Amplifier using BC109C -  As can be seen from the circuit diagram we are really using five transistors as the BD679 and BD680 are "Darlington" pairs of transistors.  The led must be a green led for correct operation.  (The voltage across a green led is higher than the voltage across a red led.) When using a 12v supply the voltage at T1 collector should be (about) 5v and at T2 base (about) 7v.  This amplifier will be unstable (it will oscillate) without the 4k7 variable resistor connected to the input. __ Designed by © David Hoult

Audio Amplifier-22 Watt -  The 22 watt amp  uses a TDA1554 two channel Audio Amp chip and is easy to build, and very inexpensive.  The circuit can be used as a booster in a car audio system, an amp for satellite speakers in a surround sound or home theater system, or as an amp for computer speakers __ Designed by Aaron Cake

Audio Booster with 1 Transistor -  Circuit only, no description is included. __ Designed by Tony van Roon  VA3AVR

Audio Line Driver -  A stereo line driver for feeding long cables or buffering an audio source. __ Designed by Andy Collison

Audio Power Amplifier Power Rating Mysteries Explained -  I receive quite a number of questions via e-mail regarding power ratings on amplifiers as well as many questions on what clipping is and why it can be bad for speakers.  Other questions include things like "What is instantaneous power, peak power, RMS power?" "What is a crest factor and how does it relate to headroom?" I also sense that there is a fair amount of mis-information circulating within the consumer   (and sometimes the pro audio) audio community.  When I was a teen just learning all of this stuff, there was no one I knew that really knew this materia __ Designed by © 2000-2007 Joe Roberts

Audio Preamplifiers -  A very convenient way of making an intercom is to use a loudspeaker as a microphone.  This is a preamp with a low input impedance suitable for this purpose __ Designed by Richard Torrens

Audio/Video Sender -  This circuit provides you with wireless audio and visual transmission to a TV.  The TV acts as a receiver, eliminating the need to buy a separate monitor.  You can also hook it up to a VCR or CCD Camera, and even set up a remote CCTV security system!Circuit design __ Contact: info @ wzmicro.com

Automatic Loudness Control -  Simple add-on module Switchable "Control-flat" option __ Contact: Flavio Dellepiane, fladello @ tin.it

Automotive 12V to +-20V converter (for Audio Amplifier) -  The limitation of car supply voltage   (12V) forces to convert the voltages to higher in order to power audio amplifiers.  In fact the max audio power x speaker   (with 4 ohm impedance) using 12V is   (Vsupply+__ Designed by Jonathan Filippi

Automotive Voltage Indicator -  Monitors battery voltage; Three-LED Display __ Contact: Flavio Dellepiane, fladello @ tin.it

AV Audio/Video Wireless Transmitter -  This circuit provides you with wireless audio and visual transmission to a TV.  The TV acts as a receiver, eliminating the need to buy a separate monitor.  You can also hook it up to a VCR or CCD Camera, and even set up a remote CCTV security system!Circuit design __ Contact: info @ wzmicro.com

Avago Tech Note: Smart gate-drive optocoupler with integrated flyback controller -  EDN-Design Ideas 03/13/2015   A smart gate-drive optocoupler for FETs & IGBTs is ideal for distributed power supplies, power inverters, motor drives, and more__ Circuit Design by Avago Tech Note

Awfully Antique Audio Amplifier  -  A funny retro project, and a new standard for schematic symbols! __ Designed by Manfred Mornhinweg

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Audio Power Amplifiers:   #'s - A       B - E      F - L      M - R      S - Z


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