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I had a thought last night about shielding coils. Would probably be too expensive. how about gold leaf for the shielding would it work and would there be any benefit. Just a thought.
Ray
Ray
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Re: Faraday shielding
When I went to a local NJ convenience store (WaWa), I received my sandwich wrapped in a thin alumium foil backed paper. It is almost like a large piece (16" X 13.75") piece of gum wrapper. The foil is very thin, much thinner than household foil on a roll.
I immediately thought that this would make a good Faraday Shield for a PI coil. My reasoning is that it is conductive enough to function as a capacitive shield, yet be thin enough to minimize current flows on it's surface. I tried to secure a wire to it by using conductive adhesive copper foil tape to create a small solder tab. My multi-meter seems to indicate good conductivity between the copper tab and all places on the alumium surface.
The size of this alumium wrapper is large enough to cut out a large doughnut shaped piece and the carefully enclose the coil, minimize the overlap on the coil cross section dimension, then adding a final spiral wrap of electrical tape over the surface to secure.
If I understood Eric Foster's discussion on this topic, I believe this foil wrapper has many desireable characteristics while also being very inexpensive.
The next time you order a sandwich, jusk ask them to double wap it.
bbsailor -
Re: Faraday shielding
I brought up the same suggestion several months ago on the PI forum. Eric shot it down for several reasons including the cost. If I remember correctly there were also some conductivity issues. However there are fake gold leafs available in craft stores around here. It is very thin aluminum colored to look like gold as well as other colors. I have not tried it. It might be worth experimenting with.
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