An effective way to reduce the sound of AC power supply of small speaker power amplifier

    The filter capacitance of many power amplifiers is too small, and four of them are only 10000 μ F and 0.22 at both ends μ The CBB capacitance of F can not only reduce the AC sound of the power amplifier in static state, but also improve the transient strength and high-frequency resolution of the power amplifier in large dynamic state. Some power amplifiers still have AC buzzing even after the above treatment, which may be due to improper grounding point. Generally, the grounding point should be selected near the filter capacitor and the "one-point grounding method" should be adopted.