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20W Amplifier Circuit based LM1875



Below diagram is the the schematic diagram of 20W power audio amplifier based power IC LM1875.
20W Amplifier Circuit based LM1875


This is a simple amplifier circuit. A LM1875 will deliver up to 20W single power audio output. You need to build 2 similar circuit for stereo 2x20 audio amplifier. Of course you will need at least 3A current supply 25V voltage supply for stereo amplifier.

Download LM1875 datasheet for project reference

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 wikipedia.org


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