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Simple Proximity Detector Sensor Circuit Diagram


A proximity sensor is a sensor able to detect the presence of nearby objects without any physical contact. This simple 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 meg ohm potentiometer which determines the anode voltage level prior to clamping This sensitivity will be proportional to the area of the surface opposing each other.


Simple Proximity Detector Sensor Circuit Diagram

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