How about a bipolar transistor (collector to +5V, emitter to 0V) with a 4V7 zener connected base-collector. Should start to conduct in the 5.2 - 5.3V area. But it is 2 components. RP On 01/04/2008, Forrest W Christian wrote: > Wouter van Ooijen wrote: > > Maybe use a bi-directional transzorb or similar instead of the two clam > > diodes. > > Hmm.. that's an idea.. I could definately replace the lower clamp diode > with something like that.. Or perhaps a unidirectional one (aka 4.7V > Zener-ish device) instead so that it still will clamp to zero. > > -forrest > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist