cellular phone calling detector circuit schematic


Posted on Feb 5, 2014

This circuit was designed to detect when a call is incoming in a cellular phone (even when the calling tone of the device is switched-off) by means of a flashing LED. The device must be placed a few centimeters from the cellular phone, so its sensor coil L1 can detect the field emitted by the phone receiver during an incoming call..


cellular phone calling detector circuit schematic
Click here to download the full size of the above Circuit.




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