[Coco] CoCo 3 Voltage Regulator heat sink

[Rick Taylor]

I think this may be my solution - I have plenty of spare fans, and I want to
keep the board as unmodified as possible. I'll just attach one to the heat
sink.

On Thu, Apr 9, 2009 at 2:09 AM, Robert Gault
<robert.gault at worldnet.att.net>wrote:

> Rick Taylor wrote:
>
>> I had found a heat sink in a box - it's something I pulled out of an old
>> switching power supply, I think, maybe 3.5 inches square aluminum with
>> fins.
>> I have it vertically mounted, seems to be adequate, but barely.
>> Incidentally, while putting the thing vertical, I applied a bit too much
>> torque and crunched the D880. I went to Jameco (with the mobo) and picked
>> up
>> these at their will call counter, with a little help from them figuring
>> out
>> what to use
>>
>> <
>>
>> http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=33048&
>>
>> I'm running it off a 200W AT style power supply. It's getting fairly
>> toasty
>> but it's been running for about an hour and nothing's caught on fire yet
>> :-)
>>
>> You can hold on to it for about three seconds before you go "wow! that's
>> hot!" and let go. I'm not particularly good with electronics. What would
>> be
>> a better replacement that might run cooler?
>>
>>
> Picking an appropriate heat sink is not a trivial problem. I'd say if you
> can't hold onto the fins for more than three seconds, you are not
> dissipating heat fast enough.
>
> Here is a url that explains in technical terms what is involved in picking
> heat sinks.
> http://sound.westhost.com/heatsinks.htm
>
> In short, the bigger the block and the more fins, the better the heat sink.
> However, if the transistor is dissipating to much power, a passive heat sink
> may not be feasible and a fan will be required.
>
>
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>



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