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Subscribe for more videos (every Wednesday and surprise specials): http://goo.gl/QjZqko I don't know much about EMI filters, only that they have capacitors and chokes to avoid electromagnetic interference. Since I was having problems with a power supply, I started testing how the interference was modified when I added different filters. Did you like it? Thumbs up! Did you not like it? Comment so we can improve! Do you want to see more? Subscribe, it's free :) Do you think it can be useful to someone else? Share the video. Regards.