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Old 28th November 2007, 12:03 AM   #1
gychang is offline gychang  United States
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Default simple heat sink, how to make?

Apologize if this is wrong forum.

I put together an amp6 and need to make a heat sink about 1x3" for the tripath chip/voltage regulator/rectifier.

Click the image to open in full size.

I have some thin aluminum plates and thinking about making my own?, what can I use to "glue" the 90degree fins?, is there a conductive silicon glue that may work?

anyone have experience?

thanks,

gychang
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Old 28th November 2007, 01:04 AM   #2
Aengus is offline Aengus  Canada
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"Arctic Silver Thermal Adhesive" is said to do this - I have no personal experience with it.

Manufacturer's instructions here.

One source here (don't know anything about them, just googled it).

Please let us know how it works if you try it.

Regards.

Aengus
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Old 28th November 2007, 01:32 AM   #3
gychang is offline gychang  United States
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Quote:
Originally posted by Aengus
"Arctic Silver Thermal Adhesive" is said to do this - I have no personal experience with it.

Manufacturer's instructions here.

One source here (don't know anything about them, just googled it).

Please let us know how it works if you try it.

Regards.

Aengus
thanks, that may work, newegg has it. I was wondering how I can make fins (glue to aluminum to aluminum), not sure if this will do it.

I seem to remember seeing "heatsink DIY" somewhere.

gychang
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Old 28th November 2007, 01:53 AM   #4
Magura is offline Magura  Denmark
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Quote:
Originally posted by gychang


thanks, that may work, newegg has it. I was wondering how I can make fins (glue to aluminum to aluminum), not sure if this will do it.

I seem to remember seeing "heatsink DIY" somewhere.

gychang

Regular epoxy will do just fine, and at a fraction of the cost.


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Old 28th November 2007, 02:34 AM   #5
amt is offline amt  United States
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Thats quite alot of work for an appropriate heatsink. And the fins wont dissipate must of the heat since the epoxy will insulate them from the plate. A big piece of AL should be enough. I cut slices with a bandsaw around the perimeter or just on 3 sides depending on the clearance needed. They can be carefully bent 90 degrees but I ususally dont bother.

amt
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Old 28th November 2007, 02:43 AM   #6
amt is offline amt  United States
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This is the easiest way though. Use a piece of "L" channel and attach the chip etc to one leg and mount the PCB to the other. It provides a large sink that also makes mounting the board a snap. Heres a Charlize using this method.

amt
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Old 28th November 2007, 10:10 AM   #7
gychang is offline gychang  United States
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Quote:
Originally posted by amt
Thats quite alot of work for an appropriate heatsink. And the fins wont dissipate must of the heat since the epoxy will insulate them from the plate. A big piece of AL should be enough. I cut slices with a bandsaw around the perimeter or just on 3 sides depending on the clearance needed. They can be carefully bent 90 degrees but I ususally dont bother.

amt

thanks so much amt. what thermal adhesive work for you?

gychang
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Old 28th November 2007, 01:21 PM   #8
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I use J-B KWIK Weld for all my heatsinking needs. It's good to 300 degrees Fahrenheit and seems to have good thermal transfer properties. A whole lot cheaper than the Arctic stuff too.

http://jbweld.net/products/jbkwik.php
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Old 28th November 2007, 03:19 PM   #9
gychang is offline gychang  United States
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Originally posted by theAnonymous1
I use J-B KWIK Weld for all my heatsinking needs. It's good to 300 degrees Fahrenheit and seems to have good thermal transfer properties. A whole lot cheaper than the Arctic stuff too.

http://jbweld.net/products/jbkwik.php

that's very helpful, I see this stuff in the auto parts store all the time.

gychang
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Old 28th November 2007, 04:03 PM   #10
amt is offline amt  United States
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gychang,

I use standard zinc oxide/silicon thermal paste - GC brand which is available everywhere. This is more that adequate for the minimal heat generated by these tiny amps/regs. Just make sure the mating surfaces are as flat and smooth as possible. If the heatsink material is not, use a sanding block with #1000 wet/dry and level it out.

If you havent read this yet, do so. Good information and explainations regarding heatsinking.

http://sound.westhost.com/heatsinks.htm#9


amt
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