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I need to choose an audio amplifier for a circuit I'm building. I hear there are several different types.. classA, class AB, class D, etc... However I'm not able to find information on these online. Can somebody tell me the difference between all these classes, as far as function, pros, cons...

We need to create a Smart Audio Amplifier for Home HiFi system. What we want is an equalized volume output with power of 50W. The input will come from a CD player, and the output will enter goto a pair of speakers. In order to do this we plan on at least two stages.. 1. automatic gain...