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Old 29th December 2004, 01:09 PM   #1
murat is offline murat  United States
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Default Shielding with aluminum foil;)

Can we shield a non-metal box with aluminum foil for amplifier enclosure? - maybe folded 4-5 times? Anyone tried?

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Old 29th December 2004, 01:29 PM   #2
SY is offline SY  United States
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Works fine (ask John Curl). The major issue is making a good, reliable electrical connection to it.
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Old 29th December 2004, 01:59 PM   #3
murat is offline murat  United States
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If multi-folded, heavy-duty foil look pretty strong. I am thinking squuezing it between two washers of bolt-nut assembly. I get pretty good contact resistance even when I touch it with multimeter leads. Thanks,

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Old 29th December 2004, 02:03 PM   #4
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Default Re: Shielding with aluminum foil;)

Quote:
Originally posted by murat
Can we shield a non-metal box with aluminum foil for amplifier enclosure? - maybe folded 4-5 times? Anyone tried?

Murat

The foil may work. But www.lessemf.com has some really nice mu-metal that works much better. A single thickness will shield more than a bunch or aluminum foil.
The stuff is fairly inexpensive. A 16" wide sheet is 18.95 per linear foot. It is surprisingly heavy and stiff for the thickness.

George
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Old 29th December 2004, 02:04 PM   #5
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Keep an eye on that contact resistance- it's likely to go up significantly over time. You've got a mechanical contact between two metals with very different work functions and reduction potentials, one of which has a high creep... That's the problem with aluminum foil for anything other than a lab lash-up.

Copper or brass foil, now those are solderable and now you're talkin' good shielding.
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Old 29th December 2004, 02:16 PM   #6
Cortez is offline Cortez  Hungary
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Sorry for off-ing: what is the best metal material to use for shielding,
to protect electonical ccts and components against disturbs from "outside" ?
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Old 29th December 2004, 02:28 PM   #7
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Default Re: Re: Shielding with aluminum foil;)

Quote:
Originally posted by Panelhead
It is surprisingly heavy and stiff for the thickness.
Not surprising, MU metal is mainly Nickel.
Specific weight of Nickel is 10% higher than that of steel.
Nickel is one of the main additives for hardened and high tensile steels.
As a kid i was often allowed to "help out" in my dads plant.
Some parts for production tools had to be made of nickel, for hardness and durability.
Machining the stuff was pretty difficult, an eight year old was very good at pressing the red button when one the tool sides was precision grinded.
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Old 29th December 2004, 02:31 PM   #8
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Aluminium is also solderable, if you know how to do it !!

Regards

Charles
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Old 29th December 2004, 02:36 PM   #9
murat is offline murat  United States
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Charles, no, I don't know how to solder aluminum. Are you planning to tell us?

Cortez, I don't know.

Murat
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Old 29th December 2004, 03:00 PM   #10
Cortez is offline Cortez  Hungary
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Aluminum to solder ? Hmm... How ?
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