Circuit principle: As shown in the figure, the auxiliary audio power amplifier circuit of LM4730. The audio input signal is applied to the input terminal 8 of the LM4730 through the potentiometers Rv, CIN, and RB. After amplification, it is output by the 3 pin and sent to the speaker through L and R (the internal amplifier B pin number is indicated in parentheses). Rv is the volume potentiometer for adjusting the volume; RIN is the set amplifier's DC bias operating point, and CIN is the input high-pass filter; RSN, CSN is used to reduce the high-end instability of the amplifier frequency; L, R Provides high impedance for high frequencies and low resistance for audio to prevent high frequency self-excitation.
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