Ryan Etwell wrote: > Tb > would be its operation temperature (units don't really matter here > since the equation just uses the difference of two temps), So I'm free to subtract 100degF from 40degC and just plug the resulting 60 into the equation!!!? Think again. ***************************************************************** 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