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Emf detector!~help

  1. Nov 17, 2006 #1
    http://www.electronics-lab.com/projects/science/006/emmeter.gif
    i want to ask
    1. is it used to detect emf ?
    is it an emf meter
    2. how to detect
    3. how does am-plifer work ?
    transistor used for??
    diode use for?
    4 if i change other value of capacitor?
    inductor?
    resistor?
    what will the effects of each??
    5. what is the error will be?
    is there any limitation???
    thankss
     
  2. jcsd
  3. Nov 17, 2006 #2

    berkeman

    User Avatar

    Staff: Mentor

    Well, if the 1mH coil at the left is an open slug, then this circuit will respond to changing magnetic fields. The current-to-voltage converter stage (the opamp) has a single pole 3dB lowpass at around 1kHz, so this circuit looks to be mainly for sensing powerline frequency B fields. Hey, maybe you should offer to visit Buisness Man and help him with his power problems!

    https://www.physicsforums.com/showthread.php?t=142685
     
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