Touch switch or proximity detector

Posted on Jan 21, 2013

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
Click here to download the full size of the above Circuit.

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

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