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Old 13th March 2009, 08:20 PM   #241
Magura is offline Magura  Denmark
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Quote:
Originally posted by Zen Mod



me wanna porn , ya kwayzee MetalBoy .....


Ok, some test-porn.


Just made it to see if it works, to not waste my PTFE board, and test how the compensation worked.

The real thing is soon to come.

Magura
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Old 13th March 2009, 08:24 PM   #242
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Quote:
Originally posted by Magura



Ok, some test-porn.


Just made it to see if it works, to not waste my PTFE board, and test how the compensation worked.

The real thing is soon to come.

Magura

wazzat ?

plexy ?

ya know that I'm blind as Bat ........

or ya are lousy with cam .....

hehe
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Old 13th March 2009, 08:26 PM   #243
Magura is offline Magura  Denmark
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Quote:
Originally posted by Zen Mod



wazzat ?

plexy ?

ya know that I'm blind as Bat ........

or ya are lousy with cam .....

hehe

Yes, I used a piece of polycarbonate sheet for the test, to spare the end mills.

1) yes, I know you're blind as a bat

2) Bad lighting, cell phone camera, me operating it, and that's what you get.


Magura
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Old 13th March 2009, 08:34 PM   #244
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Quote:
Originally posted by Zen Mod



thicker ......... but not too thick .....

dumb ........ but I'm always dumber ........



good ole L profile , also known as Winkel ,

40x40x4 mm always seems good enough

just look on pics of Papa's old Alephs , and some other hot amps ;

what you wanna see as "enough meat" , is certainly good for your amp too .
I was thinking for a 6" high heat sink, 4"x4"x0.5" .. too thick? combination heat spreader and L bracket.

I've never seen copper L profile either my Danske friend... I'm not sure if one can stick copper plate in a sheetmetal brake either...
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Old 13th March 2009, 08:35 PM   #245
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Quote:
Originally posted by Zen Mod wazzat ?

looks like he used the shower door to me...
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Old 13th March 2009, 08:49 PM   #246
Magura is offline Magura  Denmark
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Quote:
Originally posted by luvdunhill


I've never seen copper L profile either my Danske friend... I'm not sure if one can stick copper plate in a sheetmetal brake either...

I have


with a little skill, you can bend it in a sheetmetal brake, that's how I did it.

These are 10mm thick, machined on mounting surfaces.


Magura
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Old 13th March 2009, 08:50 PM   #247
Magura is offline Magura  Denmark
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Quote:
Originally posted by luvdunhill



looks like he used the shower door to me...

And?

What do you find most important, a shower door, or a fancy PCB?


Magura
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Old 14th March 2009, 01:37 AM   #248
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when it comes to doing new and strange things to metal, you can bet Magura has done it

As always, thicker is better for heat through metal. Surface area rules for metal to air transfer -- but if your fins are too long and the ends are cold, that surface area isn't helping you any.

JJ
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Old 14th March 2009, 11:59 AM   #249
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Quote:
Originally posted by luvdunhill
if I can cover the entire heat sink, that's good too
Are you sure ?

Suppose you go one step further and wrap the bracket around the entire heatsink surface, what happens to the heatsink's Rth ?

A bracket requires a reasonable flange thickness to prevent it from warping.
It's the cross-sectional area at the 90 degree angle crossing between both flanges that is of importance.
The prettier bracket will look like this =>
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Old 14th March 2009, 01:05 PM   #250
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Quote:
Originally posted by jacco vermeulen

...


whazzat ?

even dutchie whales have bear's winter snoring habit ?

winter over ?

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