Look at these heatsink diagrams for F2 please - diyAudio
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Old 22nd December 2009, 03:44 PM   #1
diyAudio Member
 
Join Date: Jun 2007
Location: Mumbai/Delhi - India
Default Look at these heatsink diagrams for F2 please

Hi all,
i have been posting various questions in these forums about an F2 build i am starting. when i actually begin i will start a build thread for all my questions but for now i am buying parts and have a question regardin heatsink choices.
the extrusions available here (in Bombay, India) all have horizontal fins. i can turn these on their side and make the fins vertical but then my heatsink length is limited to the width of the extrusion.
How much of a difference does it make if the fins are horizontal?
i am thinking of a length of about 14 inches. the heatsinks will make up the sides of my enclosure. can you please look at the images i have attached and advise.

thanks
mymindinside
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File Type: jpg hs_Mosfets_TO220_TOP3_Si-09.jpg (11.7 KB, 274 views)
File Type: jpg hs_Mosfets_TO220_TOP3_Si-10.jpg (11.1 KB, 257 views)
File Type: jpg hs_Mosfets_TO220_TOP3_Si-11.jpg (11.2 KB, 259 views)
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Old 22nd December 2009, 03:46 PM   #2
AndrewT is offline AndrewT  Scotland
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how much power does the F2 dissipate?
These sinks all look too small for a ClassA amplifier.
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Old 22nd December 2009, 03:51 PM   #3
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this is the width of the sink, i can get it any length i want, i was just wondering about the horizontal fins
for eg: if i choose the spi-063 then the width of the heatsink is 7.7 inches and the length is 14in (or any length i want) with the fins running horizontally.

the F2's rated power consumption is 75w/ch. is it correct to assume that most of this is dumped as heat through the sinks?

Maybe i should articulate my question better: should i look for longer thinner fins that are closely packed together, or thicker fins that are farther apart? is it better to have a thicker base?

Last edited by mymindinside; 22nd December 2009 at 03:57 PM.
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Old 22nd December 2009, 04:00 PM   #4
AndrewT is offline AndrewT  Scotland
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one device dissipating 37W on a 14inch length of 063 might just run cool enough.
If that did work, then you would need four 14inch lengths for a stereo amp.

The basic problem is that all the sinks are too thin, the 063 is only 7.5mm thick and that restricts good conduction out to a 75mm radius from the device. The sink beyond 75mm gets colder the further it is from the device.
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Old 22nd December 2009, 04:07 PM   #5
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uh oh. that means trouble i think. maybe i will make the top out of two sinks and the sides out of two, and mount one device on each sink.
will not look very nice though
any ideas?

mymindinside
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Old 22nd December 2009, 05:03 PM   #6
jleaman is offline jleaman  Belgium
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Are you still looking for heat sinks ? There is a person on ebay that sells very nice heat sink's and will cut them for you too.

J'
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Old 22nd December 2009, 05:06 PM   #7
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i am still looking but i think the shipping to india will be prohibitively expensive.where is this seller located?
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Old 22nd December 2009, 05:09 PM   #8
jleaman is offline jleaman  Belgium
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Quote:
Originally Posted by mymindinside View Post
i am still looking but i think the shipping to india will be prohibitively expensive.where is this seller located?
Here you go, Aluminum Extrusion HeatSink DIY Amp Kit IGBT Cooling - eBay (item 250509769380 end time Jan-04-10 08:41:32 PST)

And here is more searches for you


Extrusion HeatSink, great deals on Business Industrial on eBay!
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Old 22nd December 2009, 09:43 PM   #9
tinitus is offline tinitus  Europe
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SPI-063 looks close to whats suggested in F5 manual, one fore each device

But the bay thing looks nice, and cut to make fore cheapest possible shipping
4 of those would fine too

Tho, 4 of this would be my choise http://cgi.ebay.com/HEATSINK-ALUMINU...item2a0381cc2c

Due to shipping I bought from Germany, but had to realise shipping was just as costly from there
Crazy world

Last edited by tinitus; 22nd December 2009 at 09:53 PM.
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Old 23rd December 2009, 11:25 AM   #10
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Have you checked with Conrad in Australia? They have what you need.
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