The above list of EMI filters can be built as widespread-mode filters by bringing in an extra reference conductor. As is very well-recognised, popular-manner currents are induced by using parasitic capacitance to an outside reference, for example metallic while in the chassis or some exterior conductor (i. Here's a list https://jaredulbqf.shoutmyblog.com/30649354/not-known-facts-about-emi-filter-vs-emc-filter