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这个自动增益控制电路(AGC)由±5伏电源供电。在输入音频信号变化范围达40分贝时仍能维持输出信号幅度不变,而且保真性能极好。这个电路由运算放大器IC_1提供放大作用;结型场效应晶体管Q_1用作可变电阻器,与R_1构成可调变的分压器。Q_1的阻值取决于峰值检波放大器(由IC_3和IC_4组成)的输出电压。为了尽量减小失真,
This automatic gain control circuit (AGC) is powered by ± 5 volts. In the input audio signal range of 40 dB still can maintain the same output signal amplitude, and fidelity performance is excellent. This circuit is provided by the operational amplifier IC_1 amplification; junction field effect transistor Q_1 as a variable resistor, and R_1 constitute a variable voltage divider. The value of Q_1 depends on the output voltage of the peaking detector amplifier (consisting of IC_3 and IC_4). In order to minimize distortion,