1.5 Volt AF Amplifier: A small single battery cell AF amplifier able to drive a low impedance 8W load up to15mW, built using discrete transistors |
10 Watt Power Amplifier: Simple Class A Amplifiers |
100 Watt RMS Amplifier: This is a100-Watt basic power amp that was designed to be (relatively) easy to build at a reasonable cost. It has better performance (read: musical quality) than the standard STK module amps that are used in practically every mass market stereo receiver manufactured today. When I originally built this thing, it was because I needed a100 WPC amp and didnt want to spend any money. So I designed around parts I had in the shop. |
120 Watt Power Amplifier #1: Text is not English |
2 Channel Power Amplifier: The2-Channel Power Amplifier based on NTE1606. The circuit is powered by a12V,10-Amp power supply. The power of the output channels is4 W connected to 8-ohm loudspeakers |
20 Watt Power Amplifier: Designed to be used as car amplifier |
22 Watt Audio Amplifier: Simple stereo amplifier based on TDA1554 |
220 Watt Power Amplifier: This is a building plan for an audio amplifier with2 x220-Watt output power. Text is in Finnish. |
25 Watt MOSFET Amplifier: High Quality simple unit. No need for a Preamplifier |
3 Transistor Audio Amp (50 Milliwatt ): Here is a little audio amplifier similar to what you might find in a small transistor radio. |
30 Watt Power Amplifier: Ultra-Low distortion30-Wattpower amp |
60 Watt Into 8 Ohms Power Amplifier: |
75 Watt Power Amplifier: AKSA is a highly refined push pull solid state stereo amplifier of 75-Wattper channel |
80 Watt Amplifier 2: Uses the LM12 chip |
ALL FET MC Phono Preamp: Phono preamp with54 and 64 dB gain and RIAA accuracy is better than0.2dB, from Borbely Audio |
Balanced Low Noise Microphone Preamp: very low noise, close to the theoretical minimum, high hum rejection and variable gain with a single rotary pot, similar to that used in many professional grade mixing desks |
Circuit combines power supply and audio amplifier: 12/20/01 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit |
Class D Audio Power Amplifiers: 01/04/01 EDN-Design Ideas / Class D amplifiers are much more efficient than other Classical amplifiers, but their high efficiency comes at the expense of increased noise and distortion. You can assess the frequency- and Time-domain characteristics of a Class D amplifier, including the output filter, using online simulations. |
Class T Digital Audio Amplifier Evaluation Board: This application note describes a digital amplifier, which operates from13.5-Volt power source and outputs up to20W poor channel power. The application note is in PDF format. Uses a Digital Power Processing Technology EB TA2020 from Tripath Technology. |
Computer Microphone: adapting electret microphone to soundcards with dynamic microphone inputs |
Crest Audio LT Series LT100, LT1500 & LT2000 Schematic Set: A commercial Class D Amplifier, complete schematics in PDF format. |
Hi Fi Class D Audio Power Amplifier: The purpose of this site is to share a pulse-width modulating Class D audio power amplifier design with the world, in order to involve people that have an interest in this kind of technology. This is in effect an "open source project", i.e. the design is open and free, and those that have the interest and ability, are encouraged to feed back back into the project. |
High Performance Audio Applications of the LM833: RIAA Phono preamplifier stages and active crossover ne2-rks |
HJ 4P Professional Headphone Distribution Box: drives up to4 headphones from a single amplifier, has volume control and mono switch, product datasheet with circuit diagram in PDF format |
HJ 6 Standard Headphone Distribution Box: drives up to 6 headphones from a single amplifier, product datasheet with circuit diagram in PDF format |
Hybrid Amplifier using a 5687 Tube & Magnatec Power MOSFETs: |
Kumisa Mk. II Headphone Amp: DIY headph1-amplifier project using AD844 and some special transistors |
Leach Amp 120 Watt Power Amplifier: Latest update of the "Low Tim Amplifier", Claimed to be a very good sounding design |
Leach SuperAmp: 270-Watt Double Barreled Amplifier published in Audio magazine |
Low Noise Balanced Microphone Preamp: very low noise, close to the theoretical minimum, high hum rejection and variable gain with a single rotary pot, similar to that used in many professional grade mixing desks |
Low Noise Version of High Level Output Stage in 1031: PDF file |
MOSFET Power Amp: DIY high power MOSFET amplifier200 Wrms 8 ohms -350 Wrms4 ohms |
Not Just Another Headphone Amp: battery-powered musicians practice and monitoring amplifier for guitar |
Pocket Headphone Amplifier: portable headph1-amplifier for testing purposes using Burr-Brown OPA132 Op-Amp in a non-inverting configuration, powered with 9V battery |
Portable Headphone Amplifier: 3V Battery powered High Performance unit |
Portable Microphone Preamplifier: High headroom input circuitry. 9V Battery powered. |
Power Follower: Less wasted power than true Class A but not as good sound |
Quadraphonic Amplifier: This is a four channel amplifier ideally suited for use with quadraphonic equipment such as a Sound Blaster Live card. |
Single Chip 50 Watt / 8 Ohm Power Amplifier: Uses LM3876 HiFi amplifier IC from National Semiconductor |
Small Amplifier Circuit: Uses many amplifier ICs, from feWatt-Watts to200-Watt |
Stereo Line Driver: Power Amp Stereo Line Driver |
Subwoofer Equalizer: 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. Should the enclosure size be too small and cause a lump in the response before roll off, this is also corrected. A conventional active crossover network is then used to divide the subwoofer signal from the main channel signals. Note that there is also a separate spreadsheet calculator available for calculating component values for different situations not handled by the original circuit. |
Subwoofer Filter: 12 dB/octave low pass filter for subwoofer, includes subsonic filter |
Three Transistor Audio Amp (50 Milliwatt ): Here is a little audio amplifier similar to what you might find in a small transistor radio. |
Two Channel Power Amplifier: The2-Channel Power Amplifier based on NTE1606. The circuit is powered by a12V,10-Amp power supply. The power of the output channels is4 W connected to 8-ohm loudspeakers |
Audio Circuits: Power Amplifiers
