brief introduction： Introduction:An audio power amplifier (or power amp) is an electronic amplifier that amplifies or strengthens very low-power electronic audio signals, such as the signal from radio receiver (signals composed primarily of frequencies between 20 - 20,000 Hz, the human range of hearing) to a level that is strong enough for driving (or powering) loudspeakers. Audio amplifiers are devices or circuits that amplify and buffer audio signals to drive a low impedance, inductive speaker load. They are used

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