Look at these heatsink diagrams for F2 please

mymindinside · 22nd December 2009, 03:44 PM

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

AndrewT · 22nd December 2009, 03:46 PM

how much power does the F2 dissipate?
These sinks all look too small for a ClassA amplifier.

mymindinside · 03:57 PM

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?

AndrewT · 22nd December 2009, 04:00 PM

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.

mymindinside · 22nd December 2009, 04:07 PM

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

jleaman · 22nd December 2009, 05:03 PM

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'

mymindinside · 22nd December 2009, 05:06 PM

i am still looking but i think the shipping to india will be prohibitively expensive.where is this seller located?

jleaman · 22nd December 2009, 05:09 PM

Quote:

Originally Posted by mymindinside

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!

tinitus · 09:53 PM

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

Bill Fuss · 23rd December 2009, 11:25 AM

Have you checked with Conrad in Australia? They have what you need.

22nd December 2009, 03:51 PM	#3
mymindinside diyAudio Member Join Date: Jun 2007 Location: Mumbai/Delhi - India	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.

22nd December 2009, 09:43 PM	#9
tinitus diyAudio Moderator Join Date: Nov 2005	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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22nd December 2009, 03:46 PM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	how much power does the F2 dissipate? These sinks all look too small for a ClassA amplifier.

22nd December 2009, 04:00 PM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	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.

22nd December 2009, 04:07 PM	#5
mymindinside diyAudio Member Join Date: Jun 2007 Location: Mumbai/Delhi - India	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

22nd December 2009, 05:03 PM	#6
jleaman Banned Join Date: Apr 2002	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'

22nd December 2009, 05:06 PM	#7
mymindinside diyAudio Member Join Date: Jun 2007 Location: Mumbai/Delhi - India	i am still looking but i think the shipping to india will be prohibitively expensive.where is this seller located?

23rd December 2009, 11:25 AM	#10
Bill Fuss RIP Join Date: Oct 2005 Location: Central Florida	Have you checked with Conrad in Australia? They have what you need.