The 22 watt audio amplifier is an easy to build project, very inexpensive. The circuit can be used to boost the signal from a car audio system, home speaker system or as an amplifier for computer speakers. These are just a few practical applications, but it can be adapted to your personal needs. The circuit is compact and uses only about 55 watts; it dissipates roughly 28 watts of heat, so a heatsink is necessary. It operates at 12 Volts at about 5 Amps at full volume. Lower volumes use less current, and therefore produce less heat. The chip should run cool enough to touch with the proper heatsink installed. The parts can be found at any electronics store, making it a great DIY project for beginners.

22 Watt Audio Amplifier schematics

Parts List:

  • R1: 39K 1/4 Watt Resistor
  • C1,C2: 10uf 25V Electrolytic Capacitor
  • C3: 100uf 25V Electrolytic Capacitor
  • C4: 47uf 25V Electrolytic Capacitor
  • C5: 0.1uf 25V Ceramic Capacitor
  • C6: 2200uf 25V Electrolytic Capacitor
  • U1: TDA1554 Two Channel Audio Amp Chip
  • MISC: Heatsink for U1, Binding Posts (For Output), RCA Jacks (For Input), Wire.