> In other words, it is true that it > conducts in both directions when fully on, but it will still conduct in one > direction when off. This is due to the inherent diode (body diode) created > by the PN junction between drain and body (substrate), and the fact that > the source is usually connected to the body. True, but Dave's circuit takes this into account. ******************************************************************** Olin Lathrop, embedded systems consultant in Littleton Massachusetts (978) 742-9014, olin@embedinc.com, 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