Edward Cooper wrote: > I was under the understanding you could use nearly any voltage as a > reference for the PICs A2D and then measure readings relative to that? > Perhaps not Perhaps you should read the data sheet. The absolute maximum ratings are there for a reason. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body