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Concentric PCB Induction Balanced Coil for Metal Detectors

Discussion in 'Electronic Basics' started by Aziz, Mar 10, 2005.

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  1. Aziz

    Aziz Guest

    Concentric PCB Induction Balanced Coil for Metal Detectors


    I am using a concentric printed circuit induction balanced coil (ca.
    20 cm diameter) for a metal detector and had phantastic measuring
    - very low temperature dependency (size invariant design)
    - very thin dimension (ca. 3 mm)
    - very easy to build (just making a pcb-board)
    - no balancing needed (computer designed geometry - thus automatically
    - most of the area is for the rx-coil
    - combined small rx and big rx-coil (due to the geometry, the rx-coil
    is a spiral from the inner side to the outher side)
    - bigger transforming effect (nummer of turns for rx-coil is much more
    then for the tx-coils), to reduce the gain of the amplifier, thus
    reducing also noises of the amplifier.

    Therefore, it is very sensitive even to small metal objects (nuggets).

    By disclosuring of such an induction balance PCB coil now, it is not
    any more possible to patent such pcb ib-coils. Especially, this kind
    of pcb-ib-coils containing four coils, big receiver coil area, 1
    winding ground balancing/fine balancing coil, transmitting coil and
    canceling coil.
    Disclosure Date and Time:
    First Disclosure: 4. March 2005, 10:08 MEZ
    Updated: 10. March 2005, 15:01 MEZ

    If you want to the the sensor (search coil), just follow the link

    original image:

    Some details:
    20 cm diameter
    600 DPI Resolution

    from the inner coils numerated
    - rx-coil
    - canceling-coil
    - one winding coil for special use (ground balancing coil / fine
    - tx-coil


    PS: May be your browser cannot show such a big image. Just download
    the image and use an image-viewer.
  2. JeffM

    JeffM Guest

    You need to test links before posting them.
    You can't deep-link to anything on Tripod.
  3. Rich Grise

    Rich Grise Guest

    It works for me.

  4. Me too.

    Best regards,
    Spehro Pefhany
  5. Boris Mohar

    Boris Mohar Guest

    This works for me:

    But view full- size image
    does not


    Boris Mohar

    Got Knock? - see:
    Viatrack Printed Circuit Designs (among other things)
  6. Mark Jones

    Mark Jones Guest

    So where's the schematic? Or the complete article? There are only pictures and
    as Jeff put it, blather. Very confusing. Concentric rings on a PCB... sounds an
    awful lot like a Flux Capacitor... careful, it might warp right off your desk!
  7. Ken Smith

    Ken Smith Guest

    The performance statements are a little light on numbers too. How far can
    it see a 10 penny nail? How far can it see a soda can?

    BTW: Metal detects see modest sized objects to depths of about 2 times
    the diameter of the head at best. Very large objects such as burried
    solid copper box car can be seen a little deeper.
  8. If you look closely there are no concentric rings. They are spirals,
    which are used as inductance coils.

    That pcb board with etched coils is what sits inside the circular search
    head you move over the ground to hear what metals are in the ground.
    That circuit board is big, something like 20cm in diameter.

    (At first I thought is was a hypnotic joke picture. But as I zoomed out I
    saw the coils.)
  9. I read in that Ken Smith
    about 'Concentric PCB Induction Balanced Coil for Metal Detectors', on
    Fri, 11 Mar 2005:
    I suppose they are very common in USA.
  10. A little like the central portion of the first Black Sabbath LP perhaps.
  11. Ken Smith

    Ken Smith Guest

    Yes they often show up in such discussions on this side of the Pond.
  12. Ted Edwards

    Ted Edwards Guest

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