The objective of the GoldPic 3 project is to detect coins and jewelry in shallow water and on the beach by optimizing the timing and circuitry for detecting small items. Using readily obtainable low ...

A metal detector used to be an entirely analogue instrument, an oscillator whose frequency changed with the inductance of its sense coil when a piece of metal approached. [Łukasz Podkalicki] shows us ...

If you think of a metal detector, you’re probably thinking of a fairly simple device with a big coil and a piercing whine coming from a tinny speaker. [mircemk] has built a more modern adaptation.