... EFD,EER,DR,EC,PQ EE CORE Applications:Transformers and chokes for switching power supplies, filter, inductor ... . TOROIDAL CORE Applications:Pulse and wide-band transformers, various types of filters, inductors and chokes. U CORE Applications: ... Mainly used for flyback transformers in B/W and color TV set. EI CORE Applications:Various kinds of transformers and ...