Thanks Russel, This paper says that 1.2 watts is the practical limit, and=
=20
that above 0.8 watts PCB cooling area starts going up rapidly.  Anything=20
over a watt (as someone else said) makes one get nervous.  This explains =
why=20
my attempt at cooling a 2 watt resistor one time, by adding some PCB copp=
er=20
area under it, wasn't very effective.  I tried it just for grins, but no=20
calculations.


--Lawrence Lile
Electronic Solutions
www.projsolco.com

>From: Russell McMahon <apptech@paradise.net.nz>
>Reply-To: "Microcontroller discussion list - Public." <piclist@mit.edu>
>To: "Microcontroller discussion list - Public." <piclist@mit.edu>
>Subject: Re: [EE] Copper Heat Sink
>Date: Tue, 18 Jan 2005 15:38:01 +1300
>
>>>Once upon a time, I had a nice DOC on using copper clad boards as heat
>>>sinks.  Alas, I can't locate it anymore.
>
>In case you missed it, you really want to read this
>
>        http://www.frigprim.com/articels/thermterr_1.html
>
>Links from and is related to the page that Steve referred to.
>
>
>
>        RM
>
>--
>http://www.piclist.com PIC/SX FAQ & list archive
>View/change your membership options at
>http://mailman.mit.edu/mailman/listinfo/piclist

_________________________________________________________________
Don=92t just search. Find. Check out the new MSN Search!=20
http://search.msn.click-url.com/go/onm00200636ave/direct/01/

--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist