PI Metal Detector

Discussion in 'General Electronics Chat' started by zahidkjatoi, Apr 15, 2011.

  1. zahidkjatoi

    Thread Starter New Member

    Apr 19, 2009
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    Can anybody please explain this pulse induction metal detector.plz
     
  2. Ron H

    AAC Fanatic!

    Apr 14, 2005
    7,050
    657
    There seem to be some schematic errors around Q3. Even if you get those corrected, I don't think it's a pulse induction circuit. I think it's a Colpitts oscillator.
    The coil inductance is also wrong. 500kH? 500uH, maybe.
    Where did you get this schematic?
     
    zahidkjatoi likes this.
  3. zahidkjatoi

    Thread Starter New Member

    Apr 19, 2009
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    Respected Sir!

    Thanks for your reply.

    The inductance is put wrongly (Actually it is 45turns, 22 gauge and 3" diameter). I got this schematic from one of my friend, he also does not know anything :(

    Please let me know what does these op-amp (741) do, and whats the logic behind this metal detector.
    Thanks alot.
     
  4. Batma

    New Member

    Jun 27, 2011
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