On Tue, May 6, 2008 at 9:05 PM, KPL wrote: > OK, in most cases I would want isolation, efficiency is not that > important and sertifications even less, I'm talking about devices for > my own usage only or for some friends sometimes; It's my hobby not > business. In that case, a cell phone charger may make the most sense. Or use some kind of battery pack. If you really want to design your own AC power adapter, you may want to look company like Power Integration (TinySwitch) or companies like Fairchild. Eg: http://www.powerint.com/appcircuits.htm Xiaofan -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist