Has anyone here had experience designing battery voltage to 5V power supplies for use in PIC microcontroller applications, within the harsh heavy trucking industry? =20 Specifically, conditioning and filtering for spikes and dropouts, etc. Can you direct me to any Application Notes? Thanks -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist