There are three major types of metal detectors, in ascending order of cost: Very low frequency (VLF), multi-frequency, and pulse induction (PI). Very low frequency detectors operate on one ...

A metal detector used to be an entirely analogue instrument ... In [Łukasz]’s design the ATtiny13 fires a pulse at his coil using a MOSFET, and the voltages at the coil are sensed by an ...

Scavenge for gold, coins, and other buried treasure with these metal detectors, including models from Garrett, Nokta, and Minelab.

Metal detecting is a fun pastime, even when all you can find is a little bit of peace and a whole lot of pop tabs. [Huygens Optics] has a VLF-based metal detector that offers much more feedback ...