16 Watt Audio Bridge Amplifier Schematic Diagram
http://www.freeinfosociety.com/electronics/schemview.php?id=1067
High Quality very simple unit No need for a preamplifier
http://www.redcircuits.com//Page1.htm
2 Watt Audio Amplifier Schematic Diagram
http://www.freeinfosociety.com/electronics/schemview.php?id=1070
A 2 Watt audio amplifier made from discrete components.
http://www.zen22142.zen.co.uk/Circuits/Audio/2wamp.html
This amp uses the basic circuitry of the 60W power amp but modified for true Class-A operation
http://sound.westhost.com/project10.htm
LM1875 / TDA3050 Power Amplifier Circuit Diagram
http://sound.westhost.com/project72.htm
In the bridge configuration shown it will deliver 20 watts of power into a 2 ohm speaker operating at 14.4 volts.
http://home.maine.rr.com/randylinscott/may98.htm
Used for line, intercom or earphone application.
http://www.opamplabs.com/4f4x10.htm
Useful to listen in faint sounds 1.5V Battery operation
http://www.redcircuits.com//Page38.htm
A small class A power amplifier which delivers 20 watts into 8 ohms.
http://www.freeinfosociety.com/electronics/schematics/audio/20wamplifier.pdf