Detect EMF with an EMF Meter: How to Use, Effects & Errors

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alnywk
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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
 
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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