Touch switch or proximity detector

  
This circuit is actuated by an increase in capacitance between a sensing electrode and the ground side of the line. The sensitivity can be adjusted to switch when a human body is within inches of the insulated plate used as the sensing electrode. Thus, sensitivity is adjusted with the 1 megohm potentiometer which determines the anode voltage level prior to clamping
Touch switch or proximity detector - schematic

This sensitivity will be proportional to the area of the surface opposing each other.




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