this device is used to detect the presence of a metal, Metal Detector using Arduino Board. It can detect the RF Transmission from the Mobile Phone and triggers Buzzer to produce beep Sep 2, 2016 The basic principle behind this circuit is the idea of using a Schottky diode to detect the cell phone signal.
from Google Alert - metal detectorhttps://www.google.com/url?rct=j&sa=t&url=http://bmv-joehstadt-grumbach.com/fcuv/qlrim.php%3Fvuz%3Dmobile-detector-using-arduino&ct=ga&cd=CAIyGjBmN2Y1NDMwZGU1NzA5Mzc6Y29tOmVuOlVT&usg=AFQjCNEOMUTBODcJn6bQ9Mz27P00qRKflA
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