![]() 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.Pin3 (INPUT1+): Non-inverting i/p of the 1st comparator.Pin2 (INPUT1-): Inverting i/p of the 1st comparator. ![]()
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