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Metal Detector

Discussion in 'Electronic Design' started by Genome, Jan 8, 2006.

  1. Genome

    Genome Guest

    Who was that bloke who posted details of his metal detector project and does
    someone still have a link to it?

    Cheers

    DNA
     
  2. This post?

    ------------
    I am currently designing "A pulse Induction metal detector" that
    runs of a "Single 12 volt sealed lead acid battery" or equivalent
    (with no less than 11.2 volts) The unit is already built and I'm
    now testing it and drafting the schematic. All IC's and transistors
    are readily available, with one possible exception. An TI part
    REG1117a which is a "SOP" Pkg Low Dropout Regulator! (Surface Mount
    Device) Other IC's are TL081, MC555, LT1054, 79L05, 78L05. Circuit
    board is 2 1/2 in. * 4 5/8 in., single sided and has 265 holes. It
    has capability of "one" or "two" search coils. When using two
    coils, one is used to reject unwanted interference.

    If their is reasonable interest from people on here, I will post it
    on my Web Page as soon as it is complete.

    So if interested, e-mail me or reply on here!

    Also, Any Questions, Just Ask!

    Gary........ http://www3.telus.net/chemelec
     
  3. Genome

    Genome Guest

    Thanks

    Could be... I should do my own research! It doesn't seem to be what I
    remember but.... maybe it is.

    Having seen what he's got I don't think I'd go further with it. A 'next
    door' neighbour is thinking about splashing 500 notes on something from
    E-Bay.

    Being stupid I've suggested the DIHS route.

    DNA
     
  4. Fred Bloggs

    Fred Bloggs Guest

    Is that concertina wire I see in the background of that trampoline picture?
     
  5. Tony Williams wrote...
    REG1117? NSC makes the LM1117, LTC the LT1117, ST the LD1117,
    Fairchild the RC1117, ON Semi the NCP1117, and IR the IRU1117.
     
  6. Rick

    Rick Guest

    Could be... I should do my own research! It doesn't seem to be what I
    Metal detectors sure are expensive. (Thinking about the White's Eagle
    series). I always assumed you were paying for the knobs, coil and time
    invested in calibration....certainly the circuit could not be worth
    $500-800.

    I had an Eagle II for awhile....fun digging up the odd Mercury dime...I
    think I made like $0.33 an hour...actually that is not bad for a hobby, most
    of mine *cost* me money per hour.

    Makes you wonder though why there has never been a SERIOUS article on
    building a microprocessor controlled sophisticated metal detector...
     
  7. Genome

    Genome Guest

    This one is a MineLab Explorer XS and looks like a bit of plastic shit built
    on an A&E walking thing.

    However, neighbour has whippits what he takes out to chase rabbits so he has
    time on his hands to listen to something that goes beep.

    I'm feeling envious (coz I can spell that) already.

    DNA
     
  8. Sjouke Burry

    Sjouke Burry Guest

    What do you need a microprocessor for? Just 2 oscillators, one at a
    fixed frequency,the other uses a coil on the detection board.
    Mix them an listen to the zero beat frequency. Anything conducting
    or magnetic near that,you hear a changing tone.
    Besides,experimenting to get something useful out of that, is half
    the fun.
     
  9. Rick

    Rick Guest

    Because the Eagle II with it's microprocessor would tell me (before digging)
    I had found a 1949 quarter, 8 inches deep, with a piece of bubble gum stuck
    to it on the heads side.

    Ok, it wasn't *quite* that good, but damn close.
     
  10. Rick

    Rick Guest


    And the Minelab will tell you what flavor the gum was!
     
  11. Ken Smith

    Ken Smith Guest

    Did you ever read the Bruce Candy patent? It is an interesting way to
    reject a background of magnetic rocks. It will find gold in the midst of
    iron.
     
  12. cbm5

    cbm5 Guest

    Looks like blackberry brambles to me...so, yes.
     
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