<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">Take a look at the REF102, claimed drift is 10 ppm per year. Also look at the AD707 op-amp, very DC stable.<DIV><BR class="khtml-block-placeholder"><DIV><DIV><DIV>On Mar 9, 2006, at 9:47 AM, Steve Maietta wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"><DIV><BR>There is a guy selling voltage reference PCB's on ebay for $6. They need a particular DIP vref IC, that Im not sure are available widely, but this seems like an easy way to go to build yourself a ref source with just a few parts (also needs a PS)</DIV> <DIV> </DIV> <DIV>~Steve</DIV><DIV> <BR class="khtml-block-placeholder"></DIV><HR size="1">Relax. Yahoo! Mail <A href="http://us.rd.yahoo.com/mail_us/taglines/virusall/*http://communications.yahoo.com/features.php?page=221">virus scanning</A> helps detect nasty viruses!</BLOCKQUOTE></DIV><BR></DIV></DIV></BODY></HTML>