Circuit Project Electronic

This circuit uses a stereo amplifier IC in a 14-pin DIL package that requires very few external components to make a complete 2 Watt per channel power amplifier. The LM1877N-9 is suitable for use with 8ohm or 16ohm speakers.[...]
Source:http://www.next.gr/inside-circuits/
2-Watt-stereo-amplifier-with-LM1877N-9-l5871.html

This very high quality audio amp is based on the TDA1514A, a 9-pin flat package IC. The heatsink must be insulated from ground. The amplifier will deliver 40 watt into an 8ohm load with a 27.5 volt power rail or 40 watt into 4ohm load with a 21 volt power rail. The IC is designed [...]

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. The circuit features low harmonic and crossover distortion [...]