are my aleph 2 heatsinks big enough ? - diyAudio
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Old 7th December 2004, 01:15 PM   #1
dhole is offline dhole  United Kingdom
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Default are my aleph 2 heatsinks big enough ?

I have started my next quest. And it shall be the Aleph 2.

I have blagged some heatsinks fro old radio transmitters approx 4 if need be but I would like to use 2 . They measure 40.5cm x 9.5cm x 12 cm the are bigger in places . I have included a link to some pictures. They are pretty big and chunky . I hink there is enough surface area to fit 12 mosfets on but I will have to custom build the boards they go on. I would be interested knowing peoples opinion as wether they are fit for an aleph 2 .
regards
dave

http://www.geocities.com/dhole23/heatsink001.jpg
http://www.geocities.com/dhole23/heatsink002.jpg
http://www.geocities.com/dhole23/heatsink003.jpg
http://www.geocities.com/dhole23/heatsink004.jpg
http://www.geocities.com/dhole23/heatsink005.jpg
http://www.geocities.com/dhole23/heatsink006.jpg
http://www.geocities.com/dhole23/heatsink007.jpg
http://www.geocities.com/dhole23/heatsink008.jpg
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Old 7th December 2004, 06:31 PM   #2
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Thermal Resistance = SQRT(50 / A) Where A is the total surface area in cm.
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Old 7th December 2004, 06:46 PM   #3
MikeW is offline MikeW  United States
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Default Not big enough

Maybe Aleph 5's
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Old 7th December 2004, 07:24 PM   #4
dhole is offline dhole  United Kingdom
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thanks for the.............. short replies. I guess I could have done some measurements before asking. I have now got the heatsink xls file that was posted and will atempt to use this to calculate something. If I post htese results perhaps people could advise some more.
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dave
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Old 7th December 2004, 08:48 PM   #5
dhole is offline dhole  United Kingdom
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I have the following information from the heatsink xls. Can anyone advise as to how this translates into usefull information on determining how many of these heatsinks I would need to use per monoblock of 100w aleph 2 ....pls


Thermal Ratings
Per Fin 6.1824 deg C / Watt
H/S Body 14.4668 deg C / W
Total 0.3027 deg C / Watt
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Old 7th December 2004, 08:57 PM   #6
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Multiply the heat in watts the Aleph 2 produces by 0.3, then add something like 24 for the room temerature and you will have the temperature of the heatsink.
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Old 7th December 2004, 09:20 PM   #7
dhole is offline dhole  United Kingdom
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cheers
I am busy now searching for the "aleph 2 temperature" Anyone know ? I ambusy searching a million posts as we speak.
dave
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Old 7th December 2004, 09:34 PM   #8
dhole is offline dhole  United Kingdom
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doh as in 300 watt idling ?....
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Old 7th December 2004, 11:36 PM   #9
Stabist is offline Stabist  Slovenia
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If I understand correctly - you would like to use 2 heatsinks/channel - so you have 150W dissipation on each HS - so 150W * 0,3K/W = 45K -- and after adding average room temp of 25C - you get 70C on heatsinks ...
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Old 8th December 2004, 12:54 AM   #10
moe29 is offline moe29  United States
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at first glance they look a little small to me...

but pictures make everything look small.

at the least you would want to use two per channel.
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