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Old 12-11-2010, 06:15 PM #1
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Default Big regret after paying $30 for a heatsink

Well, these days i bought a heatsink a man made for me on a lathe, payed around $30, i tought i was doing a good deal...

Yesterday i was on a electronic components store and my friend saw some aluminum heatsinks, they were a little small for aixiz modules but i bought 20 to test, each one for $0,3 !!!

I have to open them a little bit but they fit perfectly! Check the pics, is it worth $0,3?

Can i heatsink a 1W module using 3 heatsinks of these?



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Old 12-11-2010, 06:21 PM #2
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Default Re: Big regret after paying $30 for a heatsink

Heat sinks work two ways.

First, they "absorb" heat. This is simply transferring the heat form the diode into the material of the heat sink. This usually requires significantly more mass than the heat source. Your little heat sinks do not qualify as "massive."

Second, they transfer the absorbed heat to another medium (air, water, oil, etc.) Your little heat sinks are designed to transfer heat to the air. That's what the fins are for. In order for this process to work, you have to have sufficient surface area AND the air (or other medium) has to be constantly moving away from the heat sink in order to "remove" the heat. Are you gong to have a significant amount of air moving over the heat sink via something like a fan with some directional control?

Peace,
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Old 12-11-2010, 06:26 PM #3
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Default Re: Big regret after paying $30 for a heatsink

Check this, i'll use a cooler over it:
http://laserpointerforums.com/f67/ne...317-58804.html

I'd also appreciate if you can find out why it doesn't works
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Old 12-11-2010, 06:40 PM #4
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Default Re: Big regret after paying $30 for a heatsink

Quote:
Originally Posted by luccax View Post
Check this, i'll use a cooler over it:
http://laserpointerforums.com/f67/ne...317-58804.html

I'd also appreciate if you can find out why it doesn't works
Sorry. I am most definitely NOT the electronics guy

Someone else will have to help with the electronics. Someone will be along soon.

You might take the time, in the mean time, to draw up a schematic of how you have all of the components wired together and write up how you are testing it

Peace,
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Old 12-13-2010, 11:14 AM #5
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Default Re: Big regret after paying $30 for a heatsink

What heatsink did you buy for $30?
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Old 12-14-2010, 02:20 AM #6
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Default Re: Big regret after paying $30 for a heatsink

Those look like strandar heatsinks for TO-9 transtors.

With a bit of bending they could be used for laer module cooling, but that is often more work then its worth...
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Old 12-15-2010, 12:02 AM #7
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Default Re: Big regret after paying $30 for a heatsink

if you just want a simple sink, get Aixiz's lab heat sink for $3....
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Old 12-15-2010, 03:44 PM #8
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Default Re: Big regret after paying $30 for a heatsink

oh, heres the link. can't beat the $3.50 price tag.......
http://aixiz.com/store/product_info....122721fb004ae9
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Old 01-08-2011, 06:56 PM #9
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Default Re: Big regret after paying $30 for a heatsink

Quote:
Originally Posted by Mohrenberg View Post
oh, heres the link. can't beat the $3.50 price tag.......
http://aixiz.com/store/product_info....122721fb004ae9
These are nice but were made a little too big I D-I needed to add some coper shims (from radio antenna)to get a tight fit and of course some thermal grease- I will talk with AixiZ about making tighter tolerances in thier next batch. and one for 11.9 mm green modules too.

hope I have been helpful

hak
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Old 01-08-2011, 07:12 PM #10
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Default Re: Big regret after paying $30 for a heatsink

looks like a crappy machining job to me. maybe chuck should find a little better machine shop to make his parts. the holes arent even deburred.. just looks sloppy. also uses a screw to hold the module in.. not very good looking to me.. you can tell from the pic the HS is too big for a module. should have used a drill bit and reamer to get a better fit.

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Old 01-08-2011, 07:17 PM #11
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Default Re: Big regret after paying $30 for a heatsink

That looks like such a sloppy fit (=no thermal transfer), it can hardly even classify as a proper heatsink IMO.
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Old 01-14-2011, 08:36 PM #12
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Default Re: Big regret after paying $30 for a heatsink

Aixiz's "heatsink" is useless. If you want a mountable one that will actually make contact with your module, buy the Odicforce 12mm mounts.
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