On Dec 17, 2005, at 1:06 PM, David Van Horn wrote: >>> I think there are some "words of art" to use in describing such a >>> circuit, but don't remember (if I ever knew) what they are. >>> "Schmitt trigger" (for suitably small ranges of input voltage)? BillW -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist