Auxiliary audio power amplifier circuit using LM4732

As shown in the figure, this is the auxiliary audio power amplifier circuit of LM4732. The audio input signal is added to the in-phase input terminal of LM4732 after passing through potentiometers Rv, CIN, and RB, and is sent to the speaker after amplification through L and R. Rv is a volume potentiometer, which is used to adjust the volume; RIN can set the DC bias operating point of the amplifier, and at the same time, it forms an input high-pass filter with CIN; RSn and CSN are used to reduce the instability of the high-end frequency of the amplifier; L and R provide high resistance to high frequencies, and provide low resistance channels for audio to prevent high-frequency self-excitation. Switch S1 is used to set the squelch mode. When S1 is disconnected, it is the squelch mode and the audio signal is prohibited; when S1 is closed (connected to -VEE), it is the normal working mode and the audio signal is amplified normally.