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 ...
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