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Metal detector schematics

Simple BFO metal detector schematic diagram

Heathkit Cointrack Gd-1190 Metal Locator

Heathkit Groundtrack GR-1290 VLF metal detector

White's Classic I metal detector schematic

White's Surfmaster PI schematic diagram

White's Surfmaster PI metal detector

See also:

Metal detectors theory and practice - How metal detectors work - short theory and links to simple VLF, PI and BFO designs.

Metal detecting as a hobby

Cheap metal detectors from Amazon.