emi suppression ferrite

http://claytongbof654.jigsy.com/entries/general/how-to-create-an-awesome-instagram-video-about-ferrite-core-for-power-cord

A ferrite Main is really a kind of transformer that's used in smaller transformers. It may be named a hollow Main or semi-rigid Main. It contains a core or envelope with attached plates which can be hinged.