AN-1080 GreenPAK4 Pulse Induction metal detector-security wand

Metal detection is finding increasing importance for proximity detection, security, industrial automation, locators, and treasure finders. The design presented is a pulse induction (PI), single coil design implemented with a single GreenPAK4 IC. PI designs have the advantage of tolerance to ground effects, and work even when submerged in water. It also performs well on non-ferrous metals. Presented is a new circuit design example which uses an analog comparator, digital timing vernier, and digital averaging to provide an LED bar display and audio indication.

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