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Old 3rd August 2003, 04:09 PM   #1
dorkus is offline dorkus  United States
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Default copper sheeting for shielding applications

hi all,

late last night i was tinkering with my SACD player and was thinking of some tweaks, e.g. some copper foil tape on the ICs to reduce stray lead inductance and copper sheilding here and there. i had originally thought of using materials like Ti-shield and 3M copper foil tape, but they are fairly expensive and i would have to order them from Percy Audio/Digikey respectively. so, i thought about using household aluminum foil, but it is not as conductive as copper and the lack of solderability is a problem. so i did a search on google for copper sheeting, and through some very helpful home gardening forums (they like to use metals for decorative trinkets) i came across a couple sources for copper sheeting:

http://www.misterart.com/store/view....3&group_id=794
http://www.wildwooddesigns.com/store...p?number=96947
http://www.rjleahy.com/Store/coil/index.html

apparently this stuff is fairly common in art supply stores, so i'm going to head over to my local store to see if they have it today. i'm not sure if it's pure copper or if the conductivity/solderability is good but it should be decent at least. the last link is most useful as you can get the sheeting in various gauges, as thick as 18ga.... would be very useful for any DIY project (copper-shielded chassis/circuit modules anyone?). i will try the stuff out and let you guys know how it is.

cheers,
dorkus
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Old 3rd August 2003, 04:26 PM   #2
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good idea....I went to a local scrap metal guy and got some 1"x.375" copper flat bar for 10 bucks.....I ended up with about 4 feet of it in several peices


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Old 3rd August 2003, 05:02 PM   #3
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here is a pic
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File Type: jpg cap bank1.jpg (45.9 KB, 346 views)
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Old 3rd August 2003, 05:10 PM   #4
dorkus is offline dorkus  United States
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looks good, did you use some sort of cleaner for the contact area before connecting? i need to get me some of that acid-based copper cleaner stuff...
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Old 3rd August 2003, 05:31 PM   #5
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I will disassemble those bars and clean them with scotch brite and spray them with a clear urethane when I have all the connections on them....I have a 3 inch long peice tapped out for my central ground close by hooked up with 8 ga wire

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Old 3rd August 2003, 05:37 PM   #6
dorkus is offline dorkus  United States
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good thinking, i was using some of the TechSpray stuff myself to prevent tarnishing. u may still want to use a chemical-based cleaner in addition to scotchbrite, i also highly recommend a contact enhancer such as Caig Pro-Gold. applying a little squirt to the contact area before connection can go a long way to improving long-term conductivity... i find it works very well.
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Old 3rd August 2003, 05:45 PM   #7
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yes you are correct!!...use it for comp gear and electronic connectors....I use a dielectric grease for high current applications
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Old 4th August 2003, 03:09 AM   #8
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I thought of using .25" aluminum scraps from my chassis. The terminal bosses on computer type caps all seem to be aluminum, so using an aluminum bus bar would reduce the possibility of corrosion in that junction. I know it would move the problem to the terminals connected to it, but those are more visible and serviceable. What are your thoughts guys?
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Old 4th August 2003, 03:13 AM   #9
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I've use 1/4" aluminum buss bars on
the caps, works too.

Then the screwdriver fell and shorted
the busses -- kaboom...

hehe

a chuck of aluminum melted off...

it was a 200kuf bank..

sparks = fun stuff
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Old 4th August 2003, 11:57 AM   #10
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Default aluminum connections

just a side bar to the conversation:

at one time, when the construction industry was feeling "economical" houses were wired with Aluminum power cable -- seems however that Aluminum and Copper have different thermal expansion coefficients and the joints -- at switch boxes and outlets -- would come loose after only a few years. This lead to a number of fires! They now sell outlets and switches labeled "AL-CO" for this application.

Aluminum is OK for making that 8 element log-periodic array, but leave it out of the wiring.
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