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Harbor Freight 9 functions metal detector

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  • Harbor Freight 9 functions metal detector

    Has anyone worked out the schematic for this thing?
    I know of several mods for it, and got one for giggles and grins. What I am hoping to find, is where to hook a VDI into this circuit.
    This is such a cheap, easily obtained, and reasonably sensitive detector, that it seems to me to be a fine platform to play with.
    The key is the schematic.

    I have been considering buying another one to de-populate and trace the circuit board that way.

    I know Carl has reverse engineered at least one detector and traced the schematic so I assume it can be done, but has it been done?

    There was a series of mods done by someone, and mentioned in another thread. The link to the mods is gone, but the wayback time machine has it.

    https://web.archive.org/web/20140319...-function.html

    Still, I'd like to find out where to wire the X and Y leads for a true VDI into this board.
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