This is a circuit for capacitive touch sensor that can be used for proximity detection and touch-controlled switching. Here’s the figure of the circuit;
This is a simple circuit diagram. This circuit is use for example, a finger comes close to the sensor, it creates a capacitance to Earth with a value of 30 to 100 pF. Component: Resistor, Capacitor, Diode, LM339D IC, pin header. [Circuit diagram source: extremecircuits.net]
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