> If I use a zener/resistor, what happens if the input threshold is > exceeded? Would the diode "open up" and direct the input > signal to ground? Or would it only direct the excess to ground, > so that the comparator still receives a workable signal? The zener will clip the signal, not completely attenuate it. michael brown -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu