are my aleph 2 heatsinks big enough ?

dhole · 7th December 2004, 01:15 PM

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

TheJudge · 7th December 2004, 06:31 PM

Thermal Resistance = SQRT(50 / A) Where A is the total surface area in cm².

MikeW · 7th December 2004, 06:46 PM

Maybe Aleph 5's

dhole · 7th December 2004, 07:24 PM

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.
regards
dave

dhole · 7th December 2004, 08:48 PM

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

TheJudge · 7th December 2004, 08:57 PM

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.

dhole · 7th December 2004, 09:20 PM

cheers
I am busy now searching for the "aleph 2 temperature" Anyone know ? I ambusy searching a million posts as we speak.
dave

dhole · 7th December 2004, 09:34 PM

doh as in 300 watt idling ?....

Stabist · 7th December 2004, 11:36 PM

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 25°C - you get 70°C on heatsinks ...

moe29 · 8th December 2004, 12:54 AM

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.

7th December 2004, 01:15 PM	#1
dhole diyAudio Member Join Date: Jul 2004 Location: Brighton	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

7th December 2004, 06:46 PM	#3
MikeW diyAudio Member Join Date: Sep 2002 Location: North of Boston	Not big enough Maybe Aleph 5's __________________ MikeW

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7th December 2004, 06:31 PM	#2
TheJudge diyAudio Member Join Date: Jan 2004 Location: Netherlands	Thermal Resistance = SQRT(50 / A) Where A is the total surface area in cm².

7th December 2004, 07:24 PM	#4
dhole diyAudio Member Join Date: Jul 2004 Location: Brighton	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. regards dave

7th December 2004, 08:48 PM	#5
dhole diyAudio Member Join Date: Jul 2004 Location: Brighton	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

7th December 2004, 08:57 PM	#6
TheJudge diyAudio Member Join Date: Jan 2004 Location: Netherlands	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.

7th December 2004, 09:20 PM	#7
dhole diyAudio Member Join Date: Jul 2004 Location: Brighton	cheers I am busy now searching for the "aleph 2 temperature" Anyone know ? I ambusy searching a million posts as we speak. dave

7th December 2004, 09:34 PM	#8
dhole diyAudio Member Join Date: Jul 2004 Location: Brighton	doh as in 300 watt idling ?....

7th December 2004, 11:36 PM	#9
Stabist diyAudio Member Join Date: Sep 2002 Location: Slovenia	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 25°C - you get 70°C on heatsinks ...

8th December 2004, 12:54 AM	#10
moe29 diyAudio Member Join Date: Dec 2002 Location: Florida	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.