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.

Leave Comment

characters left:

New Circuits



Popular Circuits

Oscillation issue on THS4271
Quadrature Oscillator with TLV2474
laser communication
programming propeller ic
Audio Level Meter Circuit LM3915
Long-Interval Pulse Generator
Strain Gage Load Cell for Thrust Measurement