![]() LM324 IC based Cell phone Detector Circuit Diagram This circuit can be used for multipurpose like searching for a lost phone, finding a cell phone in prohibited areas. ![]() The encoded signals can be received when the cell phone receives a call or do calls while sending and receiving the SMS. This circuit only detects the encoded signal, not the voice contents. 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.
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