John Ferrell wrote: > I fought this problem pretty hard dealing with a 500 ohm pot (voltage > divider) at the end of a 100 foot cable. The A/D looked good on the scope > without the cable and the cable looked good without the A/D. This sounds like it could be a transmission line effect to me, my guess is that the spikes from the ADC were getting reflected off the far end of the cable becoming effectively noise on future readins. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist