On Wed, 13 Jul 2011 16:22 -0400, "V G" wrote: > By input impedance, do you > mean > resistors in series with the signal line? Or a resistor shorting the > signal > line to ground? Signal to ground. Bob --=20 http://www.fastmail.fm - Does exactly what it says on the tin --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .