Hi all, A belated thanks to all who responded to my question about an encoder losing counts. I tried replacing the encoder and I got the same asymmetrical rise/fall times. However, the problem seems to have gone away. I am going to use logic with hysteresis as suggested and if I get more time, I will try to track down the original cause. Thanks, Sean -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu