On Tue, May 6, 2008 at 7:42 PM, KPL wrote: > Hi, > > Is there any simple, cheap, popular PSU circuit for small devices that > contain just a few parts around PIC? > I mean, mains powered (230V/50Hz here), 5 V output, 0.5 A maybe. Do you need isolation or not? What is the efficiency you are after at 5V/0.5A? Do you need to pass CE and UL? All these can changed the circuit quite significantly. How big can the power supply be? Xiaofan -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist