In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Beau Schwabe wrote:

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">Here is a link to a [url=http://forums.parallax.com/forums/default.aspx?m=88548&amp;f=15&amp;p=1#m88695][u][color=#800080>Low][/u][/url] technique using a BS2 consuming less than 3nA in standby mode.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana"> <o:p></o:p>

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">I designed this and used it for a "doorbell" in my daughter's playhouse.  A rechargeable 9V battery (7.2V)<o:p></o:p>

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">would last about 8 months.<o:p></o:p>

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana"> <o:p></o:p>

<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">You could cleverly implement this in a keypad instead of just the single switch setup I have.<o:p></o:p>

<o:p><FONT face="Times New Roman" size=3> [/color]</o:p>

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