This is a multi-part message in MIME format. ------=_NextPart_000_0015_01C50234.E3064100 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit > 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. With a switch ;-) This has been much discussed in the past. Here is one idea which allows a push button to wake up the processor and turn on the supply. There are a few short gaps in the traces in obvious places (yellow went missing when gif converted.) Ask if cct function unclear. 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