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Faraday's Law

Discussion in 'Electronic Design' started by Brent, Apr 4, 2004.

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  1. Brent

    Brent Guest

    I am trying to design AC magnetic field detector, to detect a signal of
    75KHz from a wire loop. For a maximum efficiency I need to know how to
    design the coil for its resonance. I have the formula (Faraday's Law on
    Induction?),
    fo=29.85(h/d)1/5 divided by nd. My question is how to associate the
    variables of the formula. How many turns wire do I make, what diameter &
    what height. Also do I need a ferrite core, or a nonmagnetic core. Should
    I incorporate a capacitor into my circuit, but what size?

    Any help would be appreciated,
    Brent
     
  2. ddwyer

    ddwyer Guest

    If a single frequency then resonate the coil with a capacitor.
    If broad band then terminate the coil in an a voltage amplifier..
    I didithis latter years ago to measure magnetic fields from power lines
    and electric cooker etc.
     
  3. Brent

    Brent Guest

    How do I calculate the size of capacitor that I need?


    Thanks,
    Brent
     
  4. the resonance frequency is omega=1/sqrt(L*C)
    A few tries are usually much simpler, as
    calculating the selfinductance of your coil is
    not trivial.

    Rene
     
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