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Old 14th January 2014, 05:51 PM   #1
wicked1 is offline wicked1  United States
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Default PMillett Landfall heatsink

I ordered a few heatsinks from Landfall systems which Pete Millett designed or helped design.
Pete's got a couple of pics on his website, but I'll attach a couple here w/ a quarter for size reference.
I really like the idea of them. All of the sand in my existing amps is attached to heatsinks inside a chassis w/ little airflow. This gets the heat out the top, along the same lines as having the tubes stick out the top.
They came w/ some useful prototype boards.
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File Type: jpg pmlfhsa.JPG (403.2 KB, 743 views)
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Old 15th January 2014, 05:30 PM   #2
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It works pretty well up to 10 or 15 watts, gets the heat out of the chassis. The proto board can accommodate up to 8 TO-220 packages which get clipped to the channel.

I have made PCBs for an A2 driver (MOSFET follower), a linear filament regulator, and a Maida-type HV regulator that fit this heatsink.

If anybody wants to design their own board to use this, let me know and I can get you the important dimensions.

Pete
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Old 15th January 2014, 06:05 PM   #3
tomchr is offline tomchr  United States
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Why the long skinny rods? Are they more efficient at radiating heat than fins?

Sorta looks like the control rods for a small nuclear reactor...

~Tom
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Old 15th January 2014, 06:17 PM   #4
wicked1 is offline wicked1  United States
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I think the idea is that these will generally be mounted vertically, and in that case the rods will be better at cooling than fins would. More opportunity for airflow from any direction.
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Old 15th January 2014, 06:28 PM   #5
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Quote:
Originally Posted by wicked1 View Post
I think the idea is that these will generally be mounted vertically, and in that case the rods will be better at cooling than fins would. More opportunity for airflow from any direction.
Exactly.

Plus, they look cool
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Old 15th January 2014, 07:03 PM   #6
Magz is offline Magz  United States
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Same idea as what they use for PC chip heat sinks. Pins are in, man.
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Old 15th January 2014, 07:22 PM   #7
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I would be interested to know if the Landfall heatsink "rod section" will fit through an existing octal socket chassis hole?
That would seem to be the most useful, as most of us have chassis punches/drills that size.

Sorry, but for most of us outside the US, a quarter coin means little in terms of size.

Gary
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Old 15th January 2014, 07:27 PM   #8
davefl is offline davefl  United States
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The heatsink is 40mm in diameter. A 1-5/8 inch hole makes for a great fit. I've also mounted one in a 1-3/4 inch hole and it looks fine. It's hard to tell the difference between the black heatsink and the black channel that it's mounted on when you're looking at it through the mounting hole.
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Old 16th January 2014, 02:21 AM   #9
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Default incorrect N chan mosfet schematic sysmbol

The A2 mosfet follower schematic symbol is incorrect (FQPF2N70).

Art
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Old 16th January 2014, 02:51 PM   #10
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Quote:
Originally Posted by audiohead View Post
The A2 mosfet follower schematic symbol is incorrect (FQPF2N70).

Art
Just imagine in your mind that the little arrow is pointing the other way. That will make it work correctly.

OK, I will fix it...

Pete
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