With Mr Lathrop's comments in mind, I have reworked the schematic as best I know how, and the image and web page along with it. If you would like to look at it, it's available at http://cowshed.8m.com/trigger/schematic.html without frames... Any commentary is appreciated, I am trying to educate myself in this art. Anthony -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads