Sunday, July 31, 2011

20W Power Amplifier Circuit based TDA2040

The following diagram is the circuit diagram of power amplifier based power IC TDA2040. The circuit capable to deliver power audio output up to 20W with single power supply. The TDA2040 is intended for use as a class AB audio amplifier.

20W Power Amplifier Circuit based TDA2040

The TDA2040 delivers great output current and has quite low harmonic and cross-over distortion. Further the device incorporates a patented short circuit protection program comprising an arrangement for automatically limiting the dissipated power so as to keep the working point on the output transistors within their secure operating area. A thermal shut-down method is also included.

You can download the TDA2040 datasheet here

20W Power Amplifier Circuit based TDA2040

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:

No comments: