On Tue, 06 Oct 2009 20:13:14 +0200, "Wouter van Ooijen" said: > > C'mon guys, how hard can this be!? A little oscillator driving a > > transformer with the feedback killing the oscillations would do. > > Maybe, but the $0.25 BOM sounds interesting. You left out the "Mrs. Lincoln" bit, which could also be referred to as the "elephant in the room" - the transformer. Cheerful regards, Bob -- http://www.fastmail.fm - A fast, anti-spam email service. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist