Here the circuit diagram of 22W stereo power amplifier. Powered with main power IC TDA1554Q, this circuit works up to 22W for each channel. For stereo channel, the power output should be up to 2 x 22W . A few externel components required to support the main component. Heatsink on the power IC is a must to prevent the chip from over heat and maximize its performance.
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 : TDA1554Q Two Channel Audio Amp Chip MISC : Heatsink For U1, Binding Posts (For Output), RCA Jacks (For Input)
The works best with 4 ohm speakers, but 8 ohm units will do. This 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.
Operated at 12 Volts and at about 5 Amps at full volume. Lower volumes use less current, and therefore produce less heat. Printed circuit board is preferred, but universal solder or perf board will do. Keep lead length short.
The TDA1554Q is an integrated class-B output amplifier in a 17-lead single-in-line (SIL) plastic power package. The circuit contains 4 x 11 W single-ended or 2 x 22 W bridge amplifiers. The device is primarily developed for car radio applications.
Download TDA1554Q Datasheet Document: