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Subject: metal detector coils

Date: 02/21/02 at 7:29 PM
Posted by: M Hunt
E-mail: dave@guartel.com
Message Posted:

I am trying to build a metal detector, however I can
find plenty of info regarding the circuitry, but nothing
on the coils. Any pointers to info? Many thanks.
I do have some specific questions if anyone can enlighten...
Why is the coil often shielded with something conductive and
then this shield connected to ground?
What defines the maximum turns for a passive recieve coil?
Why are some coils soaked in petrolium jelly?
What defines the minimum inside diameter of a coil,
especially one that connects to a resonant circuit?
When winding the coil, the wire can be wound or stacked
in a variety of arrangements, what effect does this have
on the coil and the EM field it produces?

Thanks for any help

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