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Re: Building a Faraday's cage ?

Subject: Re: Building a Faraday's cage ?
From: Rich Grise
Date: Wed, 28 Jun 2006 22:50:42 GMT
Newsgroups: sci.electronics.basics, sci.electronics.design
On Tue, 27 Jun 2006 13:57:20 +0000, GregS wrote:
> In article <12a2dbvn70s947e@xxxxxxxxxxxxxxxxxx>, "Meindert Sprang" 
> <ms@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>>"Bob Masta" <NoSpam@xxxxxxxxxxx> wrote in message
>>> As others have noted, this problem may not be helped by
>>> a Faraday cage, which only provides electrostatic shielding.
>>> But it should be easy enough to test this for yourself, by
>>> wrapping your guitar in aluminum foil.  (You should first
>>> wrap it in plastic so the foil doesn't contact the strings.)
>>> Then ground the foil... presto!  A mini-Faraday cage!
>>
>>Two corrections:
>>
>>1) a faraday cage shields agaist electrostatic and magnetic fields, in case
>>of an AC field.
>>
>>2) a faraday cage does not need to be grounded.
> 
> Thanks for the definition. In this real world situation, you
> have an imperfect cage, and you have things inside coupled
> to the outside.
>

Well, the only thing is, he's wrong[1]. A "Faraday" cage does _not_ shield
you from magnetic fields - electrostatic, yes, if it's properly grounded,
and _electromagnetic_ (not magnetic), more commonly known as RF radiation.

And if you use window screen, it's transparent above the wavelengths on 
the order of the screen mesh size or so. 

Cheers!
Rich

1. Although it could have been a translation error.


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