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More  Capacitance Touch Switches   FET Circuits

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)



More  Capacitance Touch Switches  
FET Circuits

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