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日常生活的很多电器的工作都离不开扩音设备,例如音响,耳机,话筒,电视等。扩音设备将话筒等设备中接收的微弱信号放大成可以推动扬声器发声的大功率信号。在放大电路中采用反馈机制能够改善电路的放大性能,本文主要介绍了反馈在电路中的接入形式和作用,介绍了扩音机放大电路的设计,并分析了扩音机电路中对反馈的应用。
Much of the electrical work in daily life can not be separated from the sound amplification equipment, such as audio, headphones, microphones, TV and so on. The amplifying device amplifies the weak signal received in the microphone and the like into a high-power signal that can drive the speaker to sound. In the amplifying circuit, the feedback mechanism can improve the amplifying performance of the circuit. This paper mainly introduces the feedback form and function of the feedback in the circuit, introduces the design of amplifier amplifying circuit, and analyzes the application of the feedback in the amplifier circuit.