I am planning on building a decent metal detector out of a variety of existing components but although I understand the basic concept of most metal detectors involves the induction of current in a metal object by a coil on the detector, I am slightly confused on what type of power supply a metal detector needs. From what I have read, it sounds like it runs AC through the coils, but I haven't actually seen any sources say anywhere that it is explicitly alternating current, but describes something that sounds like alternating current but is called something else (Pulsed or something like that). Is it alternating current or is it something else that I'm not familiar with? I am not asking what AC or DC is, just what is used in a metal detector. Or does a metal detector typically use a combination of DC and AC, converting DC to AC and back again?
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