Low-voltage rectifier filter circuit with light touch switch: the pulsating voltage after the high-frequency transformer is stepped down should also be rectified and filtered using diodes and capacitors, and the capacitors used in the rectifier part must not have too much AC impedance, otherwise Filter out the high-frequency AC components, so the selected capacitor should not only have a large capacity, but also have a low AC resistance. In addition, you can also see 1, 2 large inductance coils with magnetic cores and filter capacitors Filter high-frequency AC components together to ensure the output of pure DC power. Press the dome to connect the printed circuit.