Here, we are going to build small circuit named metal detector circuit which is used to check the persons in shopping malls, cinema halls, etc. to ensure that person is not carrying any explosive ...

Why would you want to detect metal? Oh, I don't know … maybe you want to find some gold in the ground. You could dig up ALL the dirt, or you could find the location that has the gold before you dig.

Between every modern prospector and that little pocket of bullion, there’s a great metal detector that can strike gold at the boardwalk or even just find jewelry you lost in the backyard. By John ...