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The range of detection can mainly depend on the mobile phone because each mobile has their own signal generation capacity. The designing of this circuit is very simple and can be used to detect the cell phone from a distance of 10 to 20 meters away. The circuit diagram of LM324 IC based cell phone detector is shown below. LM324 IC based Cell phone Detector Circuit Diagram Pin14 (OUTPUT4): O/p of the 4th comparator.Pin13 (INPUT4-): Inverting i/p of the 4th comparator.Pin12 (INPUT4+): Non-inverting i/p of the 4th comparator.Pin11 (GND, VEE): Ground or negative supply voltage.

Pin10 (INPUT3+): Non-inverting i/p of the 3rd comparator.Pin9 (INPUT3-): Inverting i/p of the 3rd comparator.Pin8 (OUTPUT3): O/p of the 3rd comparator.Pin7 (OUTPUT2-): O/p of the 2nd comparator.Pin6 (INPUT2-): Inverting i/p of the 2nd comparator.Pin5 (INPUT2+): Non-inverting i/p of the 2nd comparator.