Low-noise switching power supply schematic circuit diagram

Circuit shown in Figure, the circuit can achieve greater power output, just change the part of the device. FIG circuit R1 to the left, L1, D1, C1 to C7 are conventional common

mode filtering and rectifying circuit to obtain a DC voltage of about 30V DC-DC converter circuit for use; rightmost circuit L5, C11 and other ordinary LC filter circuit; IC2, D8, R9, R10 voltage feedback circuit composition, form a closed loop structure, stable power supply output voltage; the middle part of the DC-DC converter, the key to reducing noise in this circuit is a part of proper disposal.

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