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Old 10th June 2009, 03:42 AM   #1
jwb is offline jwb  United States
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Default Paper clips as TO-220 heat sinks

These are definitely my people

http://tangentsoft.net/elec/diy-hs.html

Click the image to open in full size.

Bottom line: the paper clip beats the coins.
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Old 10th June 2009, 07:11 AM   #2
Nrik is offline Nrik  Denmark
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Amazing
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Old 10th June 2009, 06:24 PM   #3
cbdb is offline cbdb  Canada
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Ever try pieces of aluminum beer cans? You can cut (with siccors) and bend them to custom sizes and shapes.
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Old 10th June 2009, 06:35 PM   #4
jwb is offline jwb  United States
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Usually I use cut-off bits of right-angle aluminum extrusions like these

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Old 10th June 2009, 06:51 PM   #5
HighTec is offline HighTec  Croatia
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Hmm..

are you sure that those are aluminium extrusions? They look a bit ...rusty. Steel perhaps?
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Old 10th June 2009, 07:02 PM   #6
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Gee, i never knew aluminum angles were hot rolled.
Nice round edges, they even have a corroded hot roll skin.

The academic dime article is fun though.
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Old 10th June 2009, 08:11 PM   #7
jwb is offline jwb  United States
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No those are obviously steel, but when you search Google for "angle iron" that's what you're likely to get.
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Old 10th June 2009, 11:30 PM   #8
wwenze is offline wwenze  Singapore
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The paper clip idea is effective though, because it is "self adhering".

Read this before but forgot totally about it. It just solved my resister cooling problem. Thanks.
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Old 11th June 2009, 02:50 AM   #9
taj is offline taj
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Yes, the beauty of the paperclip idea is that you can use a choice of clip sizes and bend the "fins" in whatever direction is convenient. I love it. Just make sure you have great thermal contact with the device.

I've used "fast-on" connectors wrapped around TO-92 transistors as heatsinks (to reduce thermal variation). Add a [solid] copper wire link between 2 of them for differential pairs, to keep them them [somewhat] thermally 'synchronized'.

I wonder what other household commodities we can use for DIY Audio applications that perform nicely as compared to commercial products.

..Todd
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Old 11th June 2009, 04:03 AM   #10
tinitus is offline tinitus  Europe
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Default Re: Paper clips as TO-220 heat sinks

Quote:
Originally posted by jwb


Bottom line: the paper clip beats the coins.
How do you tell

Its hard to imagine with that little contact surface of the paper clips

The copper coins seems nice, but have to be grinded smooth to work

With the coins tho Im thinking that the insufficient cooling surface might just make heating issues worse, as its just holding back the heat, and dont remove it
Might be why paper clips seem to work better, as they still allow the heat to get away


It says, "naked transistor not yet tested", which to me makes conclusion pointless

Very easy to do a nice effective finger heatsink with any kind of metal sheet, be it alu, copper or what ever
As long as its stable enough to make proper contact
A proper heatsink still seems far more effective, so I really dont see the point, other than its fun

Seems to me he made the same conclusion, or maybe I dont understand it right ?
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