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Monday, August 16, 2010

22 Watt Audio Amplifier

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

This is the schematic of the 22 Watt Amp

Parts

Part
Total Qty.
Description
Substitutions
R1139K 1/4 Watt Resistor
C1,C2210uf 25V Electrolytic Capacitor
C31100uf 25V Electrolytic Capacitor
C4147uf 25V Electrolytic Capacitor
C510.1uf 25V Ceramic Capacitor
C612200uf 25V Electrolytic Capacitor
U11TDA1554 Two Channel Audio Amp Chip
MISC1Heatsink 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.

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