> Not if you use the FET in the source follower configuration. As has > already been pointed out in earlier messages, you need a gate supply that > goes above the positive rail. > > This can be generated with a variety of methods, or you can use a high-side > gate driver that has it built in, or it can be supplied from an existing > higher voltage supply if one is already available. You're right. I was trying to keep things simple for the original poster who clearly didn't have much electronics background. Sorry, I didn't mean to leave the impression that it couldn't be done at all. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.