Electronics Forum | Tue Jun 03 16:42:33 EDT 2003 | RF Lurker
Does anyone have a method to calculate the thermal resistance of a given copper area?
Electronics Forum | Fri Jun 06 16:11:25 EDT 2003 | RF Lurker
I understand that there may not be a lot of material on this, as most threads I've seen discourage doing it. It goes against DFM to do it. But I wish to use a large copper area instead of heat sink and thermal epoxy to cool a regulator. But I can'
Electronics Forum | Fri Jun 06 18:44:26 EDT 2003 | davef
No, no. It's koscher to have thermal planes. You just need to: * Work with your fabricator to keep the layup balanced. * Relieve the plane so that it doesn't cause assembly problems. While probably not directly for your part, it gives a starting p
Electronics Forum | Tue Jun 03 20:54:29 EDT 2003 | davef
It's always good to have the lurkers out in the open. Welcome. Being uncertain about what you seek, lets take a couple of tacts: * For resistivity, look here: http://www.smtnet.com/Forums/Index.cfm?CFApp=1&Message_ID=24595 * For resistance to dama
Electronics Forum | Tue May 14 08:04:58 EDT 2002 | robbied
Hi. Does anyone out there know of a way to calculate the surface area of populated PCB's? We build many different types, and until now have been using a water displacement method, which I believe to be fundamentally flawed. Our technique is to drop a
Electronics Forum | Tue May 14 11:52:04 EDT 2002 | Claude_Couture
Excuse me, but if I remember my physics lessons well, volume is what the water displacement measures, not mass. therefore, if you take the volume of water displaced by your populated PCB, divide it by the thickness of the PCB (which is easy to measur
Electronics Forum | Tue May 14 13:18:33 EDT 2002 | Scott B
I think what David was getting at was, as an example. Take a cubic inch of gold. Surface area = 6 sq/in. Volume = 1 cu/in. Water displacement = X. Mass = Y Roll that cube of gold out to a micron thick. Surface area = football pitch. Volume = 1 cu/i
Electronics Forum | Fri May 17 14:46:29 EDT 2002 | Claude_Couture
in both samples the water displacement is 1 cubic inch of water since the volume is the same. the first has a thickness of 1 inch, the second has a thickness of a few microns. if you know the volume and one of the lengh, width or thickness, you can c
Electronics Forum | Tue May 14 13:19:23 EDT 2002 | stefwitt
Claude is right, however, this may work: Dip the empty board in paint and let the access paint drip off. Measure the volume of the paint before and after. Dip a populated board and measure how much more paint was required in percent. Measure the surf
Electronics Forum | Tue May 14 20:43:55 EDT 2002 | davef
I feel as though I�ve just walked in to a bar, where everyone I was supposed to meet has been drinking for 3 hours. First, the volume of water displacement thing doesn�t make sense, as others have commented. Second, I believe Dave Robbie wants meas
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