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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 24, 2017 02:54 PM

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

Subwoofer Equaliser -  The Linkwitz transform circuit is a hugely flexible way to equalize the bottom end of a sealed loudspeaker enclosure.  A speaker that is corrected using this method is flat from below resonance to the upper limit of the selected driver.  The low frequency roll off point is determined by the parameters of the transform circuit __ Designed by Rod Elliott  ESP

Synchronous Oscillator Converts Audio, Video to FM  -  07/22/99 EDN-Design Ideas The synchronous oscillator(SO) and the coherent phase-locked synchronous oscillator(CPSO) are universal multifunctional networks that track, synchronize, and amplify as much as 80 dB; improve SNR by as much as 70 dB; and modulate AM, FM, and FSK signals__ Circuit Design by Vasil Uzunoglu, Synchtrack, Gaithersburg, MD

TDA2030 8 Watt Amplifier -  Although the TDA2030 can deliver 20 watts of output power, I deliberately reduced the output power to about 8 watts to supply 10 watt speakers.    Input sensitivity is 200mV.  Higher input levels naturally will give greater output, __ Designed by Andy Collison

Telephone Line Audio Interface -  This device connects the telephone line to a home theater system or PA system (receiver only).  It is phone line powered and features automatic volume control (AVC).  It also mutest itself when a phone is picked up to prevent feedback. __ Designed by Andrew R. Morris

The Beast-100 to 300W Push-Pull 3CX300A1 Amp! -  This project was inspired by a visit with Eric Barbour, Applications Engineer for Svetlana , in his Portola Valley, CA office.  I was in Silicon Valley on other business and decided to pop in to meet face to face.  Eric had, in the past year or so, been very supportive of my efforts with my Single Ended SV811-10 Amplifier.  During our conversation I mentioned that I tend to keep out of the mainstream when it comes to audio design.  This is what originally lead me to try the SV811 and SV572 types over the currently popular tube choices.  With that he handed me a pair of 3CX300A1 and said "Whadaya think you can do with these?!" __ Designed by Bob Danielak

The PortaPAL Public Address System-Part 1 -  It's packed with features, is easy to build and rivals commercial systems costing much more __ SiliconChip

Thermofan to Keep Your Amp Cool -  Use a 12V computer fan to cool your amp.    Uses diode temperature sensor f __ Designed by Rod Elliott  ESP

Thermostat for 1KW Space Heater SCR controlled -  Below is a thermostat circuit I recently built to control a 1300 watt space heater.  The heater element (not shown) is connected in series with two back to back 16 amp SCRs (not shown) which are controlled with a small pulse transformer.  The pulse transformer has 3 identical windings, two of which are used to supply trigger pulses to the SCRs, and the third winding is connected to a PNP transistor pair that alternately supply pulses to the transformer at the beginning of each AC half cycle.  The trigger pulses are applied to both SCRs near the beginning of each AC half cycle but only one conducts depending on the AC polarity. __ Designed by Bill Bowden

Three Transistor Audio Amp 50 Milliwatt -  Here is a little audio Amplifier similar to what you might find in a small transistor radio __ Designed by Bill Bowden

Touch Switch using 4011 CMOS NAND Gate IC -  A touch switch is a switch that is turned on and off by touching a wire contact, instead of flicking a lever like a regular switch.  Touch switches have no mechanical parts to wear out, so they last a lot longer than regular switches.  Touch switches can be used in places where regular switches would not last, such as wet or very dusty areas __ Designed by Aaron Cake

TPA3001d1EVM Evaluation Module -  The TPA3001D1 is a 20-W mono Class-D audio power amplifier designed for 12V to 18V applications with a 4to 8-Ohm minimum speaker impedance.  The efficient Class-D operation reduces solution size and cost by eliminating the need for heat sinks

TPA3007d1 Evaluation Module -  The TPA3001D1 is a 20-W mono Class-D audio power amplifier designed for 12V to 18V applications with a 4to 8-Ohm minimum speaker impedance.  The efficient Class-D operation reduces solution size and cost by eliminating the need for heat sinks

Tube Amplifier -  We'll start our discussion on the "Li'l 4x4" by first having a look at the classic push-pull 35C5 design used in the Lafayette KT-92 amplifier.  The schematic is repeated below for easy reference.  If you wish, you can right-click on the image then select "open link in new window" if you wish to have it available as you read through the text portion of the article. __ Designed by Fred Nachbaur

Tube Amplifier Kit -  The amplifier kit uses two 11MS8 tubes per channel.  The two DC blocking capacitors and the four coupling capacitors are metallized polyester, while Samsung aluminum electrolytic capacitors are used to filter the solid-state power supply. 

Tube Amplifiers -  This project is finalized, that means it is no longer experimental.  This amplifier, altough limited in output power   (20W) , has been designed to give the best listening pleasure.  No compromise has been made during components choice: the 845 output triode is one of the best tube available today in that range of power for single-ended applications, the driver stage uses a 300B, a long revered audio tube   (note that you must use a WE 300B or a Sovtek 300B).  This technical choice has been made in some commercial   (like Marantz T1) or amateur __ Designed by puechmor @ mygale.org

Tube Car Stereo Amp -  YES, a tube amp in a CAR!!! __ Designed by Bob Danielak

Two 9v battery-powered Amps based on the LM386. Schematic & PCB/perfboard layouts. -  For better compatibility with effects driving the Little Gem, a FET buffer can be added.  Both the Little Gem Mk II   (seen below) and Ruby schematics include a simple buffer design.  No further circuit modifications are necessary, however the input capacitor value of the amp may need to be adjusted to taste. __ Contact: holler @ runoffgroove.Com

Two Transistor Amplifier -  A 2 Watt audio amplifier made from discrete components.  This was one of the earliest circuits that I ever designed and built, in Spring 1982.  At that time I had only an analogue meter and a calculator to work with.  Although not perfect, this amplifier does have a wide frequency response, low harmonic distortion about 3%, __ Designed by Andy Collinson

Two Watt Amplifier -  An audio amplifier made from discrete components with 2 Watts audio power into an 8 ohm load.  Carlos has used this amplifier on his AM radio for many years. __ Designed by Carlos Feldman

Ultra-Low Distortion Audio Power Amplifier -  This is an unusual circuit for an ultra-low distortion power amp.  According to my original notes the circuit is dated January 1977 so the circuit is not exactly modern but it is still sufficiently different to be interesting.  The circuit was designed and sold as a card by a purveyor of surplus components but, even using mostly manufacturer's rejected transistors, we managed to get about 0.02% total harmonic distortion at 30 watts with a ±25v power supply into 8 ohms.  : no bad figure even in these days of MOSFET and ICs.  In 1977 anything below 0.1% was considered excellent.  And this figure was pretty repeatable without doing much selection. __ Designed by Richard Torrens

Ultra-Low-Noise S-Band Amplifier -  06/04/12  EDN-Design Ideas Use capacitive reactance to save energy while holding a solenoid in the energized position.   Solenoid loads generally exhibit large hysteresis.  Application of the rated voltage actuates these loads.  Once they are in position, however, you can use a significantly lower voltage to thereafter reliably hold them on.  A lower sustaining voltage results in less heat production and higher efficiency.__ Circuit Design by Jessica MacNeil

Voice Amplifier -  This is a very simple and low cost audio amplifier.  Small modification in this circuit can be done to use along with walkman and intercom etc.

Voltage Controlled Amplifier -  In truth this, like many (most) VCAs is really a current controlled amplifier but there is really not too much difference since if you want to turn a CCA into a VCA you simply feed the current input from a voltage via a voltage to current converter (a.  k.  a.  'resistor') __ Designed by Richard Torrens

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

Wireless PA for Classrooms -  In large classrooms, many a times the teacher’s voice is not audible to students in the back rows.  So the teacher have to literally shout to be heard by every student. __ Electronics Projects for You

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