To solve this problem, you must first understand the mechanism of noise generation. If your speakers are not very large, simply adding filter capacitor
s and increasing capacitors will not have much effect on denoising. Replacing the filter capacitor with a low-ESR capacitor dedicated to speakers will have a good effect. As long as the output power of the speaker is not large, the advantage of simply increasing the capacitance is that it can improve the transient response of the audio, regardless of the noise level. There are many factors for the generation of noise, and it cannot be analyzed from the filter capacitor alone. Teach you a way: connect 4 small 0.1uF capacitors in parallel with the rectifier diode (that is, in the power circuit before the 4 large capacitors), the noise will be reduced to 50% of the original. The noise cannot be solved by parallel filter capacitors. The rectifier components, the zero point potential of the power amplifier should be checked for any drift, and the grounding point should be changed one by one.
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