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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: December 25, 2017 01:42 PM

Circuits Designed by Dave Johnson, P.E. :

3Khz Filter + Audio Amplifier -  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 . . . Hobby Circuit designed by David Johnson P.E.-June, 2000

3Khz Low Pass Filter Plus 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. . . Circuit by David A. Johnson P.E.-June, 2000


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

6 watt Audio Amplifier using TDA1010 -  Schematic only __ Designed by Guy Roels ON6MU

600W AUDIO AMPLIFIER -  Circuit Diagram Only

600W Audio Amplifier -  The circuit is based around {LM4702}manufactured by NATIONAL semiconductors&{MJ11029-MJ11028} by ON semiconductors It is a high fidelity audio power amplifier.  Designed for demanding consumer and pro-audio applications. __ Designed by YMYA electronics-IZHAR FAREED

60-100W Hi-Fi Power Amp -  This new amp (like the original) is based on an amp I originally designed many years ago, of which hundreds were built.  Most were operated as small PA or instrument amps, but many also found their way into home hi-fi systems.  The amp is perfectly capable of driving 4 Ohms, provided the supply voltage is maintained at no more than ±35V. __ Designed by Rod Elliott  ESP

60W Bass Amplifier -  Low-cut and Bass controls; Output power: 40W into 8 Ohm and 60W into 4 Ohm loads __ Contact: Flavio Dellepiane, fladello @ tin.it

60W Class-A Power Amp -  This circuit is on last page.    There is one amplifier configuration that is universally accepted as the ideal for audio use: Class A operation.  Many early amplifiers operated in Class A, but.  

60W Guitar Amplifier -  This design adopts a well established circuit topology for the power amplifier, using a single-rail supply of about 60V and capacitor-coupling for the speaker  (s).  The advantages for a guitar amplifier are the very simple circuitry, even for comparatively high power outputs, and a certain built-in degree of loudspeaker protection, due to capacitor C8, preventing the voltage supply to be conveyed into loudspeakers in case of output transistors' failure __ Contact: Flavio Dellepiane, fladello @ tin.it

60W MOSFET Amplifier -  To celebrate the hundredth design posted to this website, and to fulfil the requests of many correspondents wanting an amplifier more powerful than the 25W MOSFET, a 60, 90W High Quality power amplifier design is presented here.  Circuit topology __ Contact: Flavio Dellepiane, fladello @ tin.it

60W Power Amplifier -  This is a simple and low cost 60W power amplifier.  The optimal supply voltage is around 50V, but this amp can work from 30 to 60V.  The maximum input voltage is around 0.8, 1V.  As you can see, in this design the components have a big tolerance, so you can build it with almost any components that you can find at home.  The output power transistors can be any NPN types, but do not use Darlington types. __ Designed by Jacint Chapo

60W Power Amplifier -  This paper gives a practical example of the design of an off-line switching power supply.  Factors governing the choice of a discontinuous flyback topology are discussed.  The design uses a pulsed-width modulation   (PWM) control scheme implemented with a Unitrode UC3840 IC __ Designed by Jacint Chapo

65W HEXFET Power Amplifier  -  A medium power amplifier that is characterized by a lot of good sound quality, but simultaneously is very simple in the construction.  Him uses, enough time in my active loudspeakers.  In his output stage exist the very good FET transistors, technology HEXFET, 

6B4G Integrated Mono -  The amp is based on Ralph Power's simple IT-coupled PP amp.  However, being a Fixed Bias Believer, I converted both stages to fixed bias.  Output stage uses a conventional power supply for biasing; first stage, 6C45P into LL1160 (Alt-U wiring), is biased with an inline lithium button cell to 220 250V, 25 30mA.  This is probably unsafe.6C45P usually requires a low resistance grid-to-ground path (150K or less by the book) for stability.  Here, it's up to 300K plus battery.  As if it's not enough, Ua is 100V above rated maximum and PA is close to maximum.  So far, it's stable. __ Contact: (c) klausmobile

6BM8 Amplifier -  A simple but good quality audio amplifier using the 6BM8/ECL82 valve.  Capable of a couple of watts.  Information on using 100V PA line transformers as valve output transformers __ Contact: blehack @ yahoo dot com

6W Amplifier using TA7222AP -  Here is the circuit diagram of a 6W amplifier using the TA7222AP from Toshiba.  TA7222AP is an excellent integrated audio amplifier which can deliver 5.8W to a 4 Ohms load at 12V supply voltage.  The IC has very good features like, muting function, low distortion, high ripple rejection, short circuit protection, thermal shut down etc.  This amplifier can be operated from 8 to 12V and this makes it ideal for car radio applications

6W Mono car Amplifier using BA521 or BA532 Amplifier Module -  Schematic only, no circuit description __ Designed by Petr Prause

7 band graphic eqalizer -  Audio graphic equalizers are very common as commercial products (for Hi-fi, car audio and stage use) but circuits for them are very rarely published.  I didn't design this one but it's really very simple.  The details shown are for a 7 band but the principle can be extended to almost any number of bandsif you can find accurate enough components. __ Designed by Richard Torrens

7 Watt Class-A Audio Amplifier -  Behaves like a one-valve operated amplifier.  Improved version of the 3-5W Class-A amp __ Contact: Flavio Dellepiane, fladello @ tin.it

70 Watt Guitar Amplifier -  Easy to buildNo setup requiredStacked tone controls; High performance: 70W into 4 Ohm45W into 8 Ohm loads __ Contact: Flavio Dellepiane, fladello @ tin.it

70W Class AB Hi-Fi Amplifier -  This project considers the development of a 70W Hi-Fi Power Amplifier for use as part of a Hi-Fi separates music system.  The design is a fairly simple circuit topology, which is easy to understand and the author believes that the finished result sounds very nice indeed.  The web posting is developed from an original design document available in pdf below.  The detailed design issues are discussed in the pdf, while this posting discusses the more practical issues involved in producing the amp.  

78 RPM & RIAA Phono Equaliser -  Multi Standard 78 RPM and RIAA Phono Equaliser handles all "standards" __ Designed by Rod Elliott  ESP

7W Amplifier with TDA2003 audio -  Here the schematic diagram of 7W audio amplifier based on IC TDA2003.  

8 Channel Passive Summing Busses -  balanced and unbalanced input designs __ Contact: info @ forsselltech . com

8 Channel Summing Buss -  with Level, Pan, and Master controls __ Designed by Forssell Technologies/Fred Forssell or the original Designer??? shown on the schematic pages

8 Note Tune Player -  This neat little circuit can play 8 note tunes at any speed you want.  You select the notes with 8 trim pots.  The speed in selected through a ninth pot.  The circuit draws very little power and can be powered by a 9 volt battery, with the addition of a 7805 regulator to power the TTL logic used. __ Designed by Aaron Cake

8 Watt Amplifier -  an eight watt amplifier based on the LM383 power audio amplifier ic.  it's advised that you use this IC with a suitable heatsink. __ Designed by Andy Wilson

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

8 x 8 Audio Video Switch -  This is an 8-input x-output audio/video switch module to be controlled from a computer, for example fromparallel port.  Each audio/video output can be switched to any of8 inputs, separately.1-module drives1-audio/video output and has a34-pin connector to plug intosystem interface.  You can use video OPA-s on 4051 output instead.  Note that you can get full integrated video multiplexers from Maxim __ Designed by Peter Jakab

8-watt Amplifier -  Simple 8-watt audio amplifier   (LM383)

9-Volt Battery Eliminator -  for guitar pedals, radios etc __ Designed by G. Forrest Cook

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

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