Signals on the coil L2, then The output of the proximity sensor will be of 1mA when there is no metal detected and it will be around 10mA when coil is near to the metal When the output pin is high the resistor R3 will provide positive voltage to transistor Q1. Explore Circuit Diagram, Metal Detector and ...
from Google Alert - metal detectorhttps://www.google.com/url?rct=j&sa=t&url=http://www.umbrialand.org/e303/blhkriw.php%3Fvas%3Dmetal-detector-circuit-diagram-using-transistor&ct=ga&cd=CAIyGjBmN2Y1NDMwZGU1NzA5Mzc6Y29tOmVuOlVT&usg=AFQjCNHZ_TrcU1kScJz-gG_7pLxeFbwFUg
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