>Always start off with Excel and a graph - makes it a whole >lot easier to try and fit formulae to linearise the curve. >Also try using a series resistor to "move" the curve in a >range where it appears more linear over the required range. Do not forget that when you do the graph, to try log axis on it. sometimes the line becomes "magically straight" :)) -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body