Hi. (Not sure if this is [PIC] or [EE]...) I know how to use a MAX232 (or an equivalent chip) together with a PIC at 5V. But what about if you'd like to run your PIC at 3V ? Is there RS232 chips that also runs at 3V ? Or do I have to put some 3v <-> 5v buffer in between ? Jan-Erik. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.