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
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.

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