Power amplifiers ( 44 ) :

• Low power (<30W)

• 1.5V AF Amplifier - A small single battery cell AF amplifier able to drive a low impedance 8W load up to 15mW, built using descrete transistors   
• 22 Watt Audio Amplifier - simple stereo amplifier based on TDA1554   
• 2 Watt Amplifier - low distortion amplifier using discrete components   
• 3 Transistor Audio Amp (50 milliwatt) - Here is a little audio amplifier similar to what you might find in a small transistor radio.   
• 8 Watt Audio Amp - based on LM383   
• A HIFI 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.   
• Amplification audiophile et DIY - A French site about several (Lateral)mosfet designs for 10-30W amplifiers. You can also try   
• Build a Class-A Amplifier - This is an amplifier design made by Nelson Pass publishes at 1977. This amplifier gives out 20 watts per channel into 8 ohms, 24 watts into 6 ohms, and 28 watts into 4 ohms. The amplifier is powered from 120V AC power.   
• Cheap thingies to help you make some racket - small amplifier circuits using many amplifier ICs, from few watts to 200W   
• DIY Class-A Audio Amp - 15W Class-A design   
• Emitter-follower-power-amplifier - very low power (110 mW) expereimental simple design   
• Hiraga Le Classe A 20W   
• Lidström Improved ZEN i - class A FET amplifier   
• Low distortion audio amplifier - ultra-low distortion 30W power amp   
• Low Power Audio Amplifier - based on LM386   
• Power amplifier has transient rail-to-rail swing - special common-drain MOSFET-based power op amp circuit   
• "Quick and Dirty" Audio Amplifiers - For those of you who like to experiment with audio circuits and would like a "quick and dirty" amplifier that frees you from having to figure out the biasing resistors, this article has two for you (and they run off 9 Volts too!). One uses an opamp and the other used a transistor.   
• Sanken Hybrid Audio Power Amplifier Data - technical data and application circuits for 10-50W amplifiers   
• Simple Class A Amplifiers - a 10W design by J. L. Linsley Hood   
• The 2-Channel Power Amplifier: Design and Testing - 4W amplifier based on NTE 1606
• The Pass Zen Amplifier - 10 Watts of Single-Stage Single-Ended Class A   
   

• High power (>30W)

• 100W RMS Amplifier   
• 120 Watt Vertärker - 120W power amplifier   
• 50 Watt Amplifier - easy to build general purpose 50 watt amp   
• 60 Watt Into 8 Ohms Power Amplifier - a simple amp to build, uses commonly available parts and is stable and reliable   
• 75W Power Amplifier - AKSA is a highly refined push pull solid state stereo amplifier of 75W per channel   
• Ampli MOSFET - DIY high power MOSFET amplifier 200 Wrms 8 ohms - 350 Wrms 4 ohms   
• Ampli MOSFET 360W - This is a circuit for 360 W rms 8 ohms or 550 Wrms 4 ohms powerful amplifier. The plans are available in English and French.   
• Bridge/Parallel Amplifier (BPA-200) Documentation - This document provides a 200W audio amplifier solution using multiple LM336s and and design concept to reach even higher output power levels.   
• Cheap thingies to help you make some racket - small amplifier circuits using many amplifier ICs, from few watts to 200W   
• El-Cheapo - A Really Simple 60W Power Amplifier   
• Korkeallatuinen stereovahvistin 2 x 220W - This is a builging plan for an audio amplifier with 2 x 220W output power. Text is in Finnish.   
• M250: A 250W stereo power amplifier   
• P400 hi-fi high end audio power amplifier - amplifier with 382W to 8 ohms power rating, can drive speakers at 2-16 ohms range   
• Pass Laboratories DIY Projects - many amplifier projects   
• SDS Labs Schematics - solid state class A amplifiers   
• Simple 200W amplifier   
• Single Chip 50 Watt / 8 Ohm Power Amplifier - uses LM3876 hifi amplifier IC from National Semiconductor   
• The Leach Amp - 120W power amplifier, latest update of the "Low TIM Amplifier", claimed to be a very good sounding design   
• The Leach SuperAmp - 270 watt Double Barreled Amplifier published in Audio magazine   
• The LM12 - chip which can be uased ot make simple 80W amplifier   
• Vahvistin National Semiconductorin LM3886 piirillä - Amplifier circuit which uses LM3886 IC. Text of this document is in Finnish. The article includes circuit diagram and circuit board design. The LM3886 is a high-performance audio power amplifier capable of delivering 68W of continuous average power to a 4Ohm load and 38W into 8Ohm with 0.1% THD+N from 20Hz-20kHz.   
• Gainclone - A LM3886 based Gainclone amplifier with input buffer and phase inverter for bridge connection. The LM3886 delivers around 68 watts and peak power of 120 watts.
• TDA7294 - The TDA7294 is a monolithic integrated circuit in Multiwatt15 package, intended for use as audio class AB amplifier in Hi-Fi field applications (Home Stereo, self powered loudspeakers,Topclass TV). This IC datasheet gives example circuit for up to 100W amplifier using this IC.   

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