I'm using an LT3461A in a small flyback converter running at 3MHz. The high frequency was chosen to stay away from an RF receiver frequency (lower frequency switchers have harmonics that land on or close to the frequency I'm trying to receive). Does anyone know of a transformer similar to the Coiltronics VP2-0216R that operates well at 3MHz? This part is rated as "above 1MHz," but I don't think they had 3 in mind. It has 6 windings, each around 10uH. Thanks! Harold -- FCC Rules Updated Daily at http://www.hallikainen.com - Advertising opportunities available! -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist