The P3A amplifier has proven extremely popular, and the DoZ continues to provide enthusiasts with a simple, reliable and easy to build Class-A amplifier.
http://sound.westhost.com/project3b.htm
There are many instances where a simple and reliable power amplifier is needed - rear and centre channel speakers for surround-sound, beefing up the PC speakers, etc. This project is based almost directly on the typical application circuit in the LM3876 National Semiconductor specification sheet.
http://sound.westhost.com/project19.htm
It can provide much more simply by increasing the power supply voltage. The available output power is limited by the power supply. Up to 70 watts output has been achieved with this topology.
http://members.tripod.com/michaelgellis/audioamp.html
A single-ended Class-A amplifier is essentially one where there is only one active driven output device. The passive load may be a resistor, an inductor (or transformer) or - as in this amplifier - a current sink. The current sink offers the highest linearity for the lowest cost, so is the ideal choice.
http://www.sound.au.com/project10.htm
This amplifier uses LM1875 chip from National and handful of other components. Only one channel is shown, you can build two similar for a stereo version.
http://margo.student.utwente.nl/el/audio/pwramp02.gif
AN-211 Analog Devices Application Notes.
http://www.analog.com/UploadedFiles/Application_Notes/492001115525484056221917334AN211.pdf
This application note quantifies each of these important parameters and provides supporting empirical data acquired using the TC4864 in the Bridge Tied Load (BTL) topology and the Single-Ended Capacitively Coupled Load (SECCL) topology.
http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en011941
Notes: Can be directly connected to CD players, tuners and tape recorders. Simply add a 10K Log.
http://www.electronics.50g.com/c25wa.htm
The circuit functions in a big range of benefits of catering, from 20V as 60V, and it attributes 30WRMS.
http://www.electronics-lab.com/projects/audio/014
The circuit is quite compact and uses only about 60 watts. Can be used as a booster in a car audio system.
http://www.electronics-lab.com/projects/audio/006/