Hi! An uncle of mine is building a meter counter (yes, for the 4x4! 8) ). It's only a simple four stages decade counter. He knows very little of digital electronics and this is sort of an exercise. Anyway. A diesel car is a rather nice environment with little interferences. Nevertheless, they exist (in this case, the wiper). Can someone please tell some guidelines on electronics design to minimize this interferences? Or, send some www adress where to find info on the subject? I'll need them later, anyway, for the car-computer based on the 16x84... Thanx for your help, Nuno Pedrosa! -- .^. _/^\_ __ ___( | )________oOOo__O-O__oOOo_____________________/oo\________/\___ /*\\|//*\ Nuno Filipe Freitas Pedrosa \__/..\ /\/ / \(\\V//)/ mailto:Nuno.Pedrosa@oen.siemens.de _/-\__/ \ \/\ ` -=- ' Tel. :0049-89-72222342 /`\__/ CNE \/\ \ __B//|\\P__________________________________________\__/@@\____/ /\/__ `-' \__/ \/