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shielding - copper lined plastic/wood case vs. full metal case
Old 2nd January 2011
  #1
Gear Head
 
Meko's Avatar
 

shielding - copper lined plastic/wood case vs. full metal case

hello geekslutz,

I have to find a cheap and easy-to-build case for a preamp module (it's the pga2500 evaluation module from TI, https://estore.ti.com/PGA2500EVM-PGA...dule-P487.aspx)

the psu is going inside a seperate metal case so that is not an issue. I just want to shield this specific module alone against interference.

since I do not like drilling and cutting metal so much, I was thinking about putting the unit inside a cheap plastic case that I would line with rather thick copper foil / sheet with a thickness of approx. 0,5mm (0.0197 inch).

my question: would this case equal the shielding performance of a steel or aluminum case made from approx. 3mm (0.1181 inch) sheet metal?

do I really need to have a full metal case?

thanks so much for your help,


regards
meko
Old 2nd January 2011
  #2
Lives for gear
 
Radardoug's Avatar
 

If you used a plastic case you would still have to drill it. And lining it is more work. There are diecast boxes available that are very easy to drill. Use one of those. For rack cases, an aluminium one is pretty easy to drill.
As far as sheilding, a steel case will give some magnetic and electric sheilding, an aluminium case will give electric sheilding only, a copper lined case will give very good rf sheilding if done well but no magnetic sheilding.
Old 2nd January 2011
  #3
Gear Head
 
Meko's Avatar
 

thanks for your reply!

yeah, I was thinking about the magnetic aspects too since copper is not magnetically active...

am I right assuming that steel seems to be the "standard" material for (not just audio equipment) cases? If so, I would probably just go for steel if I have to drill metal anyways. I have access to good bench drills in my school, but I still like drilling plastic and wood better

thanks again
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