Good introduction to potentiometers http://www.geofex.com/Article_Folders/potsecrets/potscret.htm Maxim. Creating non linear transfer functions with linear pots http://www.maxim-ic.com/appnotes.cfm/appnote_number/838/ln/en -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body