This is a simple proximity switches with IC 4049th The IC4049 is a bipolar monolithic integrated circuit for use in metal-detection system / proximity sensing applications IC4049 includes an oscillator constituted by an external parallel resonant tank circuit and a feedback resistor connected 2-5 The internal oscillator operates near the resonant frequency of the tank is brought circuit.As a metal object near the coil begins to decrease the amplitude of the voltage across the tank gradually.
If the envelope of the oscillation a certain level, the greater the resistance the greater the travel distance.Detection-point range with a high Q coil.Maximum possible range can be achieved with a well extended to 1-inch drive circuit. Only So this circuit, the tuning circuit to a certain range.
For making it easy to a metal coil at the desired distance (1 inch) square and adjust the resistance, C1 and C2 (make Pin2 or 5) one of the outputs in the state change.
how to test it...??
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