In a metal like copper, however, the outer electrons swim around freely and are shared by all the atoms. That’s why ...

Click to view We’ll admit it: we’ll lack the ambition to perform most of the hacks you read about on Giz. But taping a calculator to an AM radio to make a metal detector? That’s right up our alley.

This homemade metal detector circuit will help you find objects composed of materials with relatively high magnetic permeability. It is not suitable for buried coins discovery that is not sensitive ...