30 Watt Amplifier HiFi using TDA2050
This circuit uses a high quality audio amplifier IC in a 5-pin TO220 package that does not require insulating washers between the metal tab and heatsink in single rail supply applications. The amp can provide 32 watt rms into 4ohm load and 25 watt rms into 8ohm.
Other Link
Bipolar Amplifier HIFI OCL 100W by BD317-BD318
40 Watt Hi-Fi amplifier using TDA1514
Easy Amplifier HiFi OCL 150W rms by Transistor
300W Mosfet power amp OCL HIFI Class AB with K1530+J201
