Auxiliary audio power amplifier circuit design based on LM4730

Circuit principle: The picture shows the auxiliary audio power amplifier circuit of LM4730. The audio input signal passes through the potentiometers Rv, CIN and RB and then is added to the input terminal 8 of the LM4730. After amplification, it is output by pin 3 and sent to the speaker through L and R (the number in parentheses is the B pin number of the internal amplifier). Rv is the volume potentiometer, used to adjust the volume; RIN is to set the DC bias working point of the amplifier, and 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, R It provides high impedance for high frequencies and low impedance channel for audio to prevent high frequency self-excitation.