On 11/1/07, PicDude wrote: > 3-4 years ago, I had seen PCB-based inductors (and resistors) at a > PCB-manufacturers trade show. At that point though, they were quite > expensive, but wondering how they would fare today. Also, I should > look into creating my own inductors on the PCB with bare traces. > > Anyone have links to how the math is done for this, and recommendations for > layouts, etc? > This is normally called planar inductor/transformer. My current design uses two planar transformer but it is not designed by me. I will tell you this is not easy and you might want to leave it for experts. But this might be related to the fact magnetics design is the weakest link for my understanding of DC/DC converters. Xiaofan -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist