> I've seen a number of designs where a high value pullup was used with a > zener, expecting to get the voltage across the zener at the nameplate > rating. It was significantly higher, of course. You meant to way "lower", I presume. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads