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.
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
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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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.
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.
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?
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.
Now who has such a large Milling machine.
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
.
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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look at post320.
SMD are available from some suppliers in single quantities.
They are generally very much cheaper if you buy in 10s, 100s or better still in 1000s.
Group Buying if there are lot's of different value components could potentially save a lot of money. Postage costs to local destinations will be cheap since SMD are inherently small and light.
I bought a small stock when retailers were clearing out their non ROHS. Some others I bought 100 off (at full retail) even though the project only required 4 or 8 pieces of each value.
SMD are available from some suppliers in single quantities.
They are generally very much cheaper if you buy in 10s, 100s or better still in 1000s.
Group Buying if there are lot's of different value components could potentially save a lot of money. Postage costs to local destinations will be cheap since SMD are inherently small and light.
I bought a small stock when retailers were clearing out their non ROHS. Some others I bought 100 off (at full retail) even though the project only required 4 or 8 pieces of each value.
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Thanks, John..... and I spent two of those years in Woomera, Andamooka, and "the Alice". I actually learned to love the outback...! 😀
I got asked again about MOSFETs and JFETs.
Please see :
http://www.diyaudio.com/forums/pass-labs/183362-f5x-euvl-approach-5.html#post2578161
For MOSFETs you want all 4 Toshiba devices (2SK1530 / 2SJ201) in one channel to have the same Vgs (and of possible Yfs) at 2A.
Patrick
Please see :
http://www.diyaudio.com/forums/pass-labs/183362-f5x-euvl-approach-5.html#post2578161
For MOSFETs you want all 4 Toshiba devices (2SK1530 / 2SJ201) in one channel to have the same Vgs (and of possible Yfs) at 2A.
Patrick
The testing team is doing a limited group buy for the components for the PCB protection and control board. There are 3 kits of components available, each one enough for one PCB. they will cost USD40 plus shipping which is better than 1/2 the price you would have to pay to buy these components outside a GB. First in best dressed. There will be a larger GB later. Parts have to come from 3 suppliers.
And done. Please contact me via PM and I will send you payment details, it will take about two weeks to get the components, and then postage time. I do however need payment up front.
While I understand getting SMD stuff for 10 sets is more economical, it is perhaps wise not to make a big GB out of this, till everything has been thoroughly tested, even though I have built the same circuit over 10 times.
Patrick
Patrick
I am not. There are 6 boards being made internally, and frankly even if there are changes they will be a few small resistors/caps or layout, not the bulk of this. I do not see the reason not to buy 10 sets. There is little risk for these people, and frankly I will send out any pieces that change on the BOM to these people for free.