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Posts posted by gan87

  1. if ur inductor is solenoidal..
    inductance - L
    Number of turns - N
    Mo = (4*pi / 10000000)  ;  pi= 22/7
    ength of the inductor = x
    Area of circular cross section = A


    L  =  ( Mo*N*N*A ) / x

    * - multiplication

  2. hi,

    lost vikings
    i feel ur post is the exact theory behind metal detectors,a weak rf range oscillator serves as the input,and sensing coil forms parts of tuned oscillator..

    if u r interested in its working;
    here it is..
    when the coil is bought near a metallic object, magnetic energy is absorbed and oscillator fails to work. this can be detected by another circuit and alarm can be triggered

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