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Amplifier Circuits:  Power Circuits
Power Amplifiers: #'s - C        D - K        L - P         Q - S        T - Z

Amplifier -- Main Page

Last Updated: November 30, 2017 10:27 AM

Circuits Designed by Dave Johnson, P.E. :

50/60Hz Sync Generator-Fully Isolated -  This circuit will produce a single pulse at the zero voltage cross points of the power line voltage.  An opto-coupler provides a very safe 5KV isolation. . . Circuit by David A. Johnson P.E.-December, 2004

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

60 Watt into 8 Ohms Power Amplifier -  A simple amp to build, uses commonly available parts and is stable and reliable __ Designed by Rod Elliott  ESP

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

6-12Vin to 5V AT 50mA Split Supply -  An easy-to-implement split-voltage power supply using the LTC3388 yields a low quiescent current, high efficiency solution for powering low current analog circuits that need a virtual ground output.  The output voltage of each device is digitally programmable to four output voltages from 1.2V to 5.0V and will support a load __ Linear Technology/Analog Devices App Note, Jan 30th 2012

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,

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

700kHz, 1MΩ Single Supply Photodiode Amplifier -  The measured output noise for this circuit was 153uVrms measured on a 1MHz bandwidth.  Supply current was a low 2.2mA. __ Linear Technology/Analog Devices App Note, Mar 22, 2010

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 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

80m hexfet power Amplifier -  Schematic only, no circuit description __ Designed by W7ZOI

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

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Power Amplifiers:  #'s - C        D - K        L - P         Q - S        T - Z

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