When using the SA series of AC-DC power supply modules, if you encounter high requirements on the output ripple noise of the module or strict EMC requirements, the module should be filtered to meet the special requirements of different environments. The following recommendations A filter circuit for reference:

Explanation of each element in the figure:

1. Rv: Varistor

2. L1, L2 are differential mode inductance, about 1mH

3. L3 is common mode inductance, about 3-5mH

4. L4 is the second-level common mode inductance, which is 15mH;

5. C1 and C4 are X capacitors, which can be 2.2uF, which are safety capacitors

6. C2, C3, C5, C6 are Y capacitors, which can be taken around 100nF, which are high voltage ceramic capacitors

7. C7 is an ordinary electrolytic capacitor, about 100uF/1A;

8. C8 is a high-frequency ceramic capacitor, about 1uF

The above circuit is for reference only, please adjust it according to the actual situation!