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Old 25th November 2012, 06:09 PM   #2451
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More work today... Took me more than I expected... that damn thermal paste is all over the place

The chassis is glued together and finished with 120 grit sandpaper (It feels way smoother than it sounds...). I also put a layer of oil/wax and the wood got a nice dark color. The damn photo again is not doing it justice. I plan to do an additional layer tomorrow and after it dries I will put everything together.

Click the image to open in full size.

You can also see the side vents and the spikes. I intent to make some smaller plates for them.

Click the image to open in full size.

The heatsinks were properly screwed in place along with the Caddocks that are now below the pcb screwed to the plate themselves.

I also removed all wiring to replace it with pure silver and I added a white led which will show on the front panel.
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Old 25th November 2012, 06:19 PM   #2452
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that chassis looks nice!
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Salas Boards 2014 #2 On order |F5TC board and power supplies available PM | Hot-Rod DCB1 boards and kits available PM |Mesmerize kits available (no boards)
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Old 25th November 2012, 10:08 PM   #2453
Salas is offline Salas  Greece
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@dimkasta

Lets see how it turns out for new parts subjective synergy and closed lid temp then.
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Old 25th November 2012, 11:18 PM   #2454
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Quote:
Originally Posted by Tea-Bag View Post
that chassis looks nice!
Depends on the eyes !
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Old 26th November 2012, 01:35 AM   #2455
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Quote:
Originally Posted by Erlend Sæterdal View Post
Depends on the eyes !
Sorry I didn t build one more aluminum faceplate with heatsink sides
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Old 26th November 2012, 08:46 AM   #2456
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Originally Posted by dtses View Post
I've read that kapton & mica are the best insulation between device and heatsink. Tried to find the link, but was unlucky.
found some info in the net. It's 0.71 1 W/(m.K) for Mica and 0.6 for Kapton or even 0.12, though not sure if these are the right values for my tape...

Quote:
Originally Posted by Salas View Post
...Or two inputs and a switch to dcb1 in. One input going through the attenuator, another directly to dcb1.
thanks!

I have few pics of mine as well. I've run it for half of an hour with 3R css resistors. What could I say, it was about 60c on this tiny toroid (just confirmed what Andrew said dozen of pages ago), 80c on CSS Rs, 75c on mosfets, 60c on MUR860s, 55c on the sinks. I'll get some M2 bolts to attach mosfets properly on this week and continue with preliminary burnings tests

Last pic shows the layout, please let me know if it's decent enough?! toroid will be replaced with something <80mm width & <55mm height (probably should be some custom narrow 80VA or 65VA r-core transformer).

Yet another thing to clarify As my goal is >=1A (I need >65VA transformer), would it be good to add additional solid 10mm aluminum plates to the heatsinks (as on pic 2) or perhaps to add a solid 10x160x250mm plate to the bottom? What I want is to win some several hundreds mA more to burn it even harder

dimkasta
very nice chassis!
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Last edited by dtses; 26th November 2012 at 08:59 AM.
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Old 26th November 2012, 09:07 AM   #2457
Salas is offline Salas  Greece
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After you will have the Mosfets properly bolted on sinks and final CCS current of choice, we will know the temperatures on sinks and Mosfet cases you will measure. From there we will be able to judge if they will be safe conditions in the long run or you will need to upgrade thermals either for pads or for extra metal.
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Old 26th November 2012, 09:13 AM   #2458
Salas is offline Salas  Greece
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*See to give the MUR diodes some contact to the metal floor if not bothering to bolt and insulate individually which can be PITA. An insulating strip running their tabs and a bracket pressing them all together on their plastic cases maybe. Matters at the current level you aim at.
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Old 26th November 2012, 09:24 AM   #2459
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How much voltage you got now across the current setting resistors on average?
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Old 26th November 2012, 10:30 AM   #2460
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Originally Posted by Salas View Post
*See to give the MUR diodes some contact to the metal floor if not bothering to bolt and insulate individually which can be PITA.
thanks! is it safe to keep them above 60c? Anyway I was planning to attach them to the chassis.

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How much voltage you got now across the current setting resistors on average?
it's 2.02 &1.85vdc with 2 x 6R per rail. So it's >600mA now. Not sure how much more could I get from the trafo as it's already on the edge to my understanding

I'll assemble the bottom lid and heatsinks and make the proper measurements. Will see then how far could I go.
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