hi mark , sounds great !! i 'll try to get one myself. is there any specific info i need. cd number etc. as i would assume that they have more than one cd in their range tfyt mark glen ************ Mark Newland wrote: > Tells you how far I am in reading my E-mail if I'm just getting around to > reading this. I got this free data book library CD from Siemens Matsushita > Components and on it was a magnetic-design-tool program. I've never used > it but the help file looked like it was informative (and over my head). > > Kelly Schauf wrote: > > > Question: > > > > Does anyone know of any good sites out there for hobbyists wanting to > > roll their own flyback transformers or similar inductors for use in > > homemade switching power supplies? Specifically, info on cores to use, > > winding technique, types of wire, how to test a homemade inductor to > > measure its value, etc.? > > > > Thanks in advance, > > > > Kelly Schauf