Sunday, December 18, 2011

22W Audio Amplifier with TDA1554

Here the 22W audio amplifier which is low cost and very easy to build. You can use this circuit as a booster in a car audio system, an amplifier for satellite speakers in a surround sound or home theater system, or as an amplifier for computer speakers

22W Audio Amplifier with TDA1554

Circuit Notes

  1. Use 4 ohm speakers for best performance, but 8 ohm units can be used too.
  2. The circuit dissipates roughly 28 watts of heat, so a good heatsink is necessary. The TDA1554 chip should keep cool enough to touch with the proper heatsink installed.
  3. The circuit works at 12 Volts at about 5 Amps at full volume. Lower volumes use less current, and therefore produce less heat on the TDA1554 chip.
  4. Construction on Printed circuit board (PCB) is preferred, but universal solder or perf board will do since the design is very simple. Keep lead length short.

Parts List:
R1 = 39K
C1,C2 = 10uf/25V
C3 = 100uf/25V
C4 = 47uf/25V
C5 = 100nF
C6 = 2200uf/25V
U1 = TDA1554

About Audio Amplifier
An audio amplifier is an electronic amplifier that amplifies low-power audio signals (signals composed primarily of frequencies between 20 - 20 000 Hz, the human range of hearing) to a level suitable for driving loudspeakers and is the final stage in a typical audio playback chain.

The preceding stages in such a chain are low power audio amplifiers which perform tasks like pre-amplification, equalization, tone control, mixing/effects, or audio sources like record players, CD players, and cassette players. Most audio amplifiers require these low-level inputs to adhere to line levels.

While the input signal to an audio amplifier may measure only a few hundred microwatts, its output may be tens, hundreds, or thousands of watts. More explanation about power audio amplifier can be found at

This is a video tutorial about how to a very simple audio amplifier based on the LM386 amplifier chip. It can be built for less than $20 (or might be less than $8 in some countries) and used to amplify any low level audio signal including a guitar, bass or mp3 player.

Watch the video:

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