Dual power supply audio power amplifier circuit using LM1875

As shown in the figure, this is the dual-power supply audio power amplifier circuit of LM1875. The input signal VIN is coupled to the 1st pin of LM1875 through C1, and the power is amplified and output from the 4th pin to the speaker. R5 and C5 are connected in series at the output end to suppress high-frequency noise. The positive power supply VCC and the negative power supply -VEE are connected to the 5th pin and the 3rd pin respectively, and a 100μF electrolytic capacitor and a 0.1μF small capacitor are connected in parallel as power supply decoupling filter, among which the 0.1μF small capacitor mainly filters out high-frequency noise.