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"Induction Balance" coil tuning

Discussion in 'Electronic Basics' started by Thomas M, Jan 17, 2005.

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  1. Thomas M

    Thomas M Guest

    We have a circuit that is a 50kHz 'induction balance' metal detector. Two
    transmit coils that canel each other out and a receiver coil that picks up
    any disturbance in the canceled field. Winding the coils is difficult to
    get them exactly tuned and canceled. Is there an electrical
    component/circuit that can be added that will let us 'dial in' the fine
  2. John Larkin

    John Larkin Guest

    Yes. An RC network that has adjustable amplitude and phase shift would
    take a bit of the transmit signal and inject it into the receiver; you
    could then adjust for null.

  3. Jamie

    Jamie Guest

    well yes.
    a simple Pot between the 2 of them supplying the single to the coils.
    use the center tap as the feed from the OSC supply.
    the outer will connect to the coils.!
    1 to each 1 leg of each coil.
    the remaining legs are tied together to the common.

    i don't know the amount of current you are using but
    wire wound pots come in a variety of sizes.
    just use a low R Value...
    depending on how far off your coils are going to be will
    determine how wide of a range you need.
    you could also have 2 AMps driving the coils with a balance control.
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