On Mon, 12 Aug 2002, Herbert Graf wrote: > Look up triacs and opto-couplers, they are perfect for this sort of > application. TTYL For the low voltage stuff, I'd go with the MOSFETs instead. I have found it to be a perfect solution. Very little power wasted, parts are pretty cheap, you can use logic level MOSFETs to avoid needing driver transistors and such. Here's the old thread: http://www.piclist.com/techref/postbot.asp?by=thread&id=Switching+low%2Dvoltage+AC&tgt=_top&key=%22Switching+low+voltage+AC+%22&from= My original post: http://www.piclist.com/techref/postbot.asp?by=time&id=piclist\2002\02\18\114448a&tgt=_top First mention of using MOSFETs: http://www.piclist.com/techref/postbot.asp?by=time&id=piclist\2002\02\18\180632a&tgt=_top Dale -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.