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Circuits designed by David Johnson, P.E.
Last Updated on: Friday, March 12, 2010 12:07 PM

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 Capacitance Touch Switches   FET Circuits

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FINGER TOUCH ACTIVATED SWITCH
It does not get any easier if you want a solid state switch that is activated by the touch of a finger. Two small metal pins route voltage through the finger skin to a MOSFET switch. The circuit is great for situations where a membrane type mechanical switch is not desired.
 

Click on Drawing Below to view PDF version of Schematic

Circuit Finger Activated Switch Circuit designed by Dave Johnson, P.E. (June 3, 2000)

Master Schematic Category List  -  David A. Johnson, P.E.
Capacitance Touch Switches   FET Circuits
 
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