Hi to all engineers, I am working on portable application where I need to use 9 volt battery with pic and on/off keypad. my question is if I use 5 volt regulator in off condition it will drain the battery if I completely turn it off how can I turn it back on there is no standby voltage any idea? will highly appreciate. Andre -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist