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Old 15th May 2013, 07:05 PM   #1881
massimo is offline massimo  Italy
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Very nice Walter. I clearly recognize your Swiss half in this building
Where did you source the heatsinks? They aren't from hifi2000....
And what about the white pcbs?
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Old 15th May 2013, 07:06 PM   #1882
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WalterW, that is one heck of a beautiful build.
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Old 15th May 2013, 07:20 PM   #1883
WalterW is online now WalterW  Netherlands
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Thanks everybody!

@Massimo: white boards are from forum member Teabag.
Heatsinks: https://www.distrelec.nl/elfa3~nl_nl...5-641-31&hst=4
Please don't buy them all
I used 4 of those for this build.
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Old 15th May 2013, 07:21 PM   #1884
biju55 is online now biju55  India
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Walter W .. Nice!!!


That is some great work!
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Old 16th May 2013, 11:30 AM   #1885
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Nice built - no much unnecessary space in there . 1.25A @ 33.2V sounds pretty fearless to me . Whats the temperature of the Mosfet and whats the temperature of the diode heat sink?

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Old 16th May 2013, 12:26 PM   #1886
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Quote:
Originally Posted by WalterW View Post
The MOSFETs are biased at 1.25 A each at 33.2 volts. Max temp on the heatsinks of 52.3 degrees Celsius.
Funny thing, your heatsink in 200mm height, would go up ~34C for 166W dissipation. (according to the datasheet)
At 25C ambient, close to 6OC heatsink temperature.

And only provided that the C/W number need not be corrected for operating at dT above ambient.

Your numbers suggest that the overlapping way you attached the square framework bars to the heatsinks, draws some serious heat away from the primary coolers. (aka rather interesting)

Definitely the looks of a couple of hundred hours of sweating.
Only pancakes for you, the schmokes are already there.
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Old 16th May 2013, 04:10 PM   #1887
WalterW is online now WalterW  Netherlands
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Hi Jacco,

Your calculation is right, you just assumed my Tamb is 25C, but hey at this moment it is 18.7C in my shack.
Thanks to the fact we haven't seen the sun here in Utrecht since the beginning of 2013 The worst spring ever....
Even in my livingroom it's barely 20C.

But I must say the heatsinks really starts to dissipate above 50C, even when pulling 400 watt from the mains, they were still below 60C, don't know the exact numbers, I was too busy shutting the amp down
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Last edited by WalterW; 16th May 2013 at 04:11 PM. Reason: typo
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Old 16th May 2013, 09:58 PM   #1888
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Quote:
Originally Posted by WalterW View Post
but hey at this moment it is 18.7C in my shack.
Brrrr, your Swiss side, I suppose ?

(really good heatsinks, though. ~1 dm3/W/C )
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Last edited by jacco vermeulen; 16th May 2013 at 10:04 PM.
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Old 17th May 2013, 07:04 AM   #1889
WalterW is online now WalterW  Netherlands
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Quote:
Originally Posted by Abraxas336 View Post
Nice built - no much unnecessary space in there . 1.25A @ 33.2V sounds pretty fearless to me . Whats the temperature of the Mosfet and whats the temperature of the diode heat sink?

Regards
Sven
I've been measuring this and it concerns me... when the amp is around 53C the outputs are around 70C, I even measured 71,2C as max
On average I would say the housings of the MOSFET are around 15 degrees hotter than the heatsink... seems a lot...maybe my mica / silicone paste combi isn't that good.
Though I already splitted the mica insulators twice. So four times thinner than original.
The diodes under the transformers are around 45C, so that's OK.
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Last edited by WalterW; 17th May 2013 at 07:05 AM. Reason: extra info
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Old 17th May 2013, 08:09 AM   #1890
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WalterW - buy Keratherm pads from Zhoufang in vendor's bazaar... 0.07 degC/W
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