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Last Updated on:  06/19/2009 02:07:10 PM

1.5V Touch Activated Switch Circuit
 designed by David A. Johnson, P.E.

A single 1.5v silver oxide button cell powers this complete touch activated switch circuit for 5 years.  It features both a normally open and a normally closed set of solid state switch thermals.  It also has an adjustable sensitivity, which can be set for a touch capacitance change as small as 1 picofarad.

Click on Schematic below to view PDF version of this Circuit
Circuit Touch Activated Switch designed by Dave Johnson, P.E. ( January 18, 2002)
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