>> A micro does not need a current-limiting resistor in its power rail > > HV PICs? Well, if you want to be picky, maybe The resistor is for the shunt regulator, not the micro. No resistor would be necessary for Vext below 5V -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist