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Heat sinks
By Norm, Section Homebrewed Electricity Posted on Mon Aug 28, 2006 at 10:21:35 AM MST
An obvious source

Looking at a persons diary had a nice
heat sink...where have I seen something like
this ?
....of course the cylinder head of a lawnmower
upside down!
or has a lot of us been using these and
never gave it a second thought? So obvious?
( :>) Norm.

Heat sinks | 4 comments (4 topical)

Re: Heat sinks (3.00 / 0) (#1)
by disaray1 on Mon Aug 28, 2006 at 05:58:13 AM MST

Or the cyl head from older 2 stroke air cooled dirt bike...talk about surface area!...and a small adaptor, one could utilize the spark plug hole for the screw in type diodes or such...

disaray1

Re: Heat sinks (3.00 / 0) (#2)
by ghurd on Mon Aug 28, 2006 at 07:05:39 AM MST

Dime-a-dozen junk weed wacker block?

Add a low temp snap disk and computer fan for the times its needed?
G-
Ghurd.info

Re: Heat sinks (3.00 / 0) (#3)
by stephent on Mon Aug 28, 2006 at 04:44:53 PM MST

An old aluminum storm door/window molding can be used for a small heat sink.
There's a few smaller heat sinks in computer power supplies as well--(of course this is preaching to the choir).
Old commercial radio (business or police) radios have the whole backside made from a heat sink, usually, and even a few mounting and insulating (electric insulating) kits as well back there..
Turning an old hard drive main chassis part into a heat sink souldn't be very hard and some have a nice cover as well to make a "box" out of with the guts tore out and reassembled on some.
Old computer CPU heatsinks have a second purpose as well sometimes, as well as the fan straddling the heatsink.
Even an old coke (or your favorite beverage--??) can will make an imprompto heatsink for small diodes/FET's/etc. Wrap a narrow strip around a little diode and leave a inch or two of "wing" to it--dab a bit of epoxy between the wings and hold with a hemostat--or roach clip/alligator clip--did i just say that?
I forget who makes that heat conducting epoxy (stuff is listed as just that--heat conducting and works better then regular epoxy, but it is usually conductive electrically) --but it works well to "stick" a heat sink to a small part.
Even a large patch of copper on a circuit board will get rid of a bunch of heat.
But for those really large heat dissapating requirements--those old aluminum B&S or other engine previously stated make really good ones just for sheer thickness/mass.
But one I have used and don't recommend is a thick flat bottomed aluminum cooking pot--those when discovered being cut up can lead to a pump knot on your head!

Re: Heat sinks (3.00 / 0) (#4)
by wooferhound on Wed Aug 30, 2006 at 10:14:33 AM MST

Dinges posted about this in February

http://www.fieldlines.com/story/2006/2/1/11217/77097

W o o f -={(

Heat sinks | 4 comments (4 topical)

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