EMI FIlters; what are they, how do they work and when do you need them? This is discussed in this video part of the What, Why, When and How series.
Why Switch mode PSUs need them but no linear PSUs.
Also discussed: a home made EMI Probe.
EMI Filter: https://www.aliexpress.us/item/3256805630603279.html
Chapters:
0:00 Intro
1:02 Schematic
2:45 Differential vs. Common mode interference
6:43 Linear Power Supply
9:02 Lin. PSU Tear-down
12:04 Lin. PSU Ripple
14:28 Switch mode PSU
18:38 TV PSU Example
22:39 TV EMI Filter Schematic
28:08 EMI Probe
29:55 Investigating PSU wave-forms
33:13 Conclusion
