The 22 watt amp is easy to build, and very inexpensive. The circuit can be used as a booster in a car audio system, an amp for satellite speakers in a surround sound or home theater system, or as an amp for computer speakers. The circuit is quite compact and uses only about 60 watts. The circuit is not mine, it came from Popular Electronics.
Schematic
Parts
| Part | Total Qty. | Description |
| R1 | 1 | 39K 1/4 Watt Resistor |
| C1,C2 | 2 | 10uf 25V Electrolytic Capacitor |
| C3 | 1 | 100uf 25V Electrolytic Capacitor |
| C4 | 1 | 47uf 25V Electrolytic Capacitor |
| C5 | 1 | 0.1uf 25V Ceramic Capacitor |
| C6 | 1 | 2200uf 25V Electrolytic Capacitor |
| U1 | 1 | TDA1554 Two Channel Audio Amp Chip |
| MISC | 1 | Heatsink For U1, Binding Posts (For Output), RCA Jacks (For Input), Wire, Board |
Notes
1. The circuit works best with 4 ohm speakers, but 8 ohm units will do.
2. The circuit dissipates roughly 28 watts of heat, so a good heatsink is necessary. The chip should run cool enough to touch with the proper heatsink installed.
3. The circuit operates at 12 Volts at about 5 Amps at full volume. Lower volumes use less current, and therefore produce less heat.
4. Printed circuit board is preferred, but universal solder or perf board will do. Keep lead length short.
from :: http://www.electronics-lab.com/projects/audio/006/index.html
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