Amplifiers are used to amplify weak electrical signals into acoustic devices with a certain electrical power. It can amplify audio signals from microphones, record players, laser (CD) players, recorders and radios to push the speakers out. Among them, the audio signal output by the microphone is the weakest. First, preamplification is performed, and then mixed with other signals in the mixing stage, and then amplified by the boost stage, and finally the power amplification stage outputs a signal of sufficient power.
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