F5X -- the EUVL Approach - Page 37 - diyAudio
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Old 27th July 2011, 11:29 AM   #361
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Quote:
Originally Posted by CanAm Man View Post
I know what you mean, Patrick. My eyes turned 64 today--along with (groan) the rest of my body.

I just completed design and prototyping on a 35-gHz GaAs FET and SiC semiconductor pulsed-chirp radar using all SMT/SMD components....about 300 of them. Worst part was designing the eight-layer microstrip pcb (i.e., pcb traces as inductors, bi-directional couplers, filters, dispersive delay lines, etc) for that monster.....

So, I'm ready for the F5X challenge! I'm looking forward to it.....

My continued thanks to you and the gang.......
That's what I'd call a really extended top end
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Old 27th July 2011, 11:38 AM   #362
ashaw is offline ashaw  Australia
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EUVL, would it be possible to do some simulations for the thermal benefits (if any) of covering the heatsink with a copper heat spreader? what thickness would be most beneficial to the devices do you think. I am considering trying it when I get my case.
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Old 27th July 2011, 12:00 PM   #363
AndrewT is offline AndrewT  Scotland
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Introducing an extra thermal interface that is counter-productive to improved Thermal Conductivity.
You will find that thickness of copper and thickness of backplate and area of copper and area of backplate all interact with each other to leave a very complex 3d mapping of well performing ratios and atrociously performing ratios.

I'd suggest you would need to develop a mathematical model equally as complex to be sure you would actually improve the Dissipation Capability.
I would further take a guess that the assumptions taken to release that improved thermal Performance would make the "improved" heatsink almost impossible to manufacture
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Last edited by AndrewT; 27th July 2011 at 12:02 PM.
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Old 27th July 2011, 12:01 PM   #364
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If you mean, bolting down the FETS with a metal bar rather than just screws through the hole in the tab, yes it has been demonstrated to provide the highest heat transfer, between the two methods.

If you meant useing metal to bridge two heatsinks together, I believe it will be less efficient and more expensive then just getting the right sink from the start.
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Old 27th July 2011, 12:04 PM   #365
ashaw is offline ashaw  Australia
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I am getting a conrad sink in the EUVL case GB. I do not know of any copper heat sink that is available of this size, is there one?
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Old 27th July 2011, 12:12 PM   #366
AndrewT is offline AndrewT  Scotland
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You could get a quote to get a copper ingot machined to a very good heatsink !
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Old 27th July 2011, 12:22 PM   #367
ashaw is offline ashaw  Australia
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Probably could be done, that is however about $500 in copper ingots, and that is before the milling fees. I would however get about half of that back when I sell the scrap copper to a metal reclaimer... perhaps.
Now who has such a large Milling machine.
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Old 27th July 2011, 12:38 PM   #368
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You could even use Liquid Metal thermal paste on a copper sink
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Old 27th July 2011, 12:38 PM   #369
EUVL is offline EUVL  Europe
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If that is what you want seriously, we can give you a quote.
My gut feeing says you might gain 2~3 reduction in peak temperature, at 10x the price.

You can also braze one together from plates.

http://sound.westhost.com/articles/diy-heatsink.htm


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Last edited by EUVL; 27th July 2011 at 12:43 PM.
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Old 27th July 2011, 12:41 PM   #370
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Quote:
Originally Posted by AndrewT View Post
I see lots of SMD on the reg PCB.
Do we have SMD on the amp PCB?
Do we have a list of these SMD components?
Should we organise a Group Buy of the SMD?

I am about to place an order with Rapid online, which I could hold back for a week or two if I am going to add in UK & European requests for SMD components.
What are 'SMD' components and Is there a group buy soon?
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