... ,EI,EF,EFD,EER,DR,EC,PQ EE CORE Applications:Transformers and chokes for switching power supplies, filter, inductor etc. UF ... 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 chokes.Antenna ferrite cores,soft ferrite cores,magnetic cores ...