Sunday, August 22, 2010

TDA7240A, 20W Car Amplifier Circuit

This is TDA7240A based bridge amplifier circuit for car audio system. You may use this circuit for home audio system. The output power will be up to 20W.

Schematic Diagram:
TDA7240A, 20W  Car Amplifier  Circuit circuit diagram

PCB Layout:
TDA7240A, 20W  Car Amplifier  Circuit PCB layout using TDA7240A

Note: The schematic and PCB layout have taken from datasheet. Please download the datasheet HERE

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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