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Filtering: capacitors used in filter circuits are called filter capacitors, which are used in power supply filtering and various filter circuits. The filter capacitors remove signals in a certain frequency band from the total signal [2]. Decoupling: capacitors used in decoupling circuits are called decoupling capacitors, which are used in DC voltage supply circuits of multistage amplifiers. Decoupling capacitors eliminate harmful low-frequency intersecti*** between each amplifier [2]. High frequency damping: the capacitance used in the high frequency damping circuit is called the high frequency damping capacitor. In the audio negative feedback amplifier, in order to suppress the possible high frequency self excitation, this kind of capacitor circuit is used. To eliminate the high frequency screams that may occur in the amplifier [2].