Single power supply audio power amplifier circuit composed of LM3875

As shown in the figure, this is the single-power-supply audio power amplifier circuit of LM3875. The basic working principle of LM3875 single-power supply is the same as that of dual-power supply, except that: when single-power supply is used, two 100kΩ resistors are used to divide the voltage to get 0.5V as the bias voltage, which is added to the 7th pin of the LM3875 input terminal through a 75kΩ resistor, so that the output voltage varies up and down with 0.5V as the reference, so that the maximum dynamic range can be obtained. *Components are optional components according to actual conditions, mainly used to suppress the high-frequency self-oscillation of the amplifier; if there is no high-frequency self-oscillation and the amplifier works stably, it is not necessary.