Audio power amplifier circuit powered by a single power supply using LM1875

As shown in the figure, this is the audio power amplifier circuit powered by LM1875 single power supply. The basic working principle of LM1875 single power supply is the same as that of dual power supply, except that: when powered by single power supply, R1 and R2 are used to divide the voltage, 1/2VCC is taken as the bias voltage and added to pin 1 through R3, so that the output voltage varies up and down based on 1/2VCC, thus obtaining the maximum dynamic range.