Fred,

Could you specify the amount of shielding needed?  Although 
coated cases can sometimes help, they do have a tendency to leak 
around the joints.  You may want to look at doing a shield can on 
the most sensitive parts of your circuit, and then decouple the 
rest of the circuitry as appropriate.  We really need more 
information, specifically what signals are going in/out of the 
box, and how much shielding is required.

Ken

----- Original Message ----- 
From: "fred jones" <boattow@hotmail.com>
To: <piclist@mit.edu>
Sent: Sunday, April 22, 2007 4:11 PM
Subject: [EE] Enclosure shielding question


> Hi all,
> I am building a project that has some high gain, low noise 
> amplifiers and
> will need to be in a shielded housing.  My first choice was to 
> buy a metal
> enclosure but I could not find one that fit other requirements. 
> I ended up
> building it around a Hammond mfg 1598J plasic enclosure.  Can 
> anyone suggest
> a way to shield the inside of the box?  Is there some type of 
> spray that I
> could spray inside to do this?  The only requirement of the 
> shielding
> material is that it has to be non-ferrous.  I will be 
> discarding the plastic
> end panels and having some aluminum ones machined.  Thanks so 
> much for any
> suggestions.
> FJ
>
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