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Old 23rd August 2002, 09:42 PM   #1
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Default WANTED! P3A Amp heatsinks!

This may be a long shot but is anyone out there blessed with two heatsinks that are the right size (and preferably pre-tapped) for 2 P3A boards? [Around 1Deg C per Watt 170mm*80mm]

I would be greatful for any replies - I'm from the UK so preferably no replies from too far away (unless you know some way to post heavy items gravity free!)

Thanks for looking

 
Old 24th September 2002, 09:18 PM   #2
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<center>Anyone???



Please???
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Old 25th September 2002, 11:43 AM   #3
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Default heatsinks

Hi,

If you can't find anything more exactly suitable, I have some heatsinks available. Here's a description I gave to someone else:

"My calculations and comparisons with other heatsinks seem to indicate they'd be more like 1C/W, though. That is conservative actually, as they look pretty identical to the one that is rated at 0.9 or 0.58C/W in the (1997!) RS catalogue I have. They are 150 x 200 mm (the 0.9C/W in RS was/is 125x200, and the 0.58 C/W was/is larger than these). There are 29 fins which run parallel with the short dimension which are 25mm long (actually 21mm ignoring the base thickness). I'd guess at 0.8 C/W or there abouts... They have a threaded hole near each corner (so can easily be turned into square enclosures with a little aluminium angle), and are drilled and tapped (twice) for transistors either side of the midpoint of a line running down the middle. Ideal for flatpacks, but TO-3s would require more drilling or a bracket. My only reservation with them is that they are powder coated (black) rather than anodised, and if they are dropped the coating on the edges of the fins can chip."

A tenner each, I'm in London.

Cheers, Jake
 
Old 25th September 2002, 07:58 PM   #4
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Cheers for the reply - I've been looking for a while now, is there any chance you could post or email me a pic?

...so far they sound interesting for the price, especially considering RS want's something like 25-45 for this sort of Deg C/Watt



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Old 26th September 2002, 05:57 PM   #5
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Sorry, no pics and no way to take any.

Rarkov did a render from the description which I've tried to attach. Pretty damn acccurate, if you can imagine them black!
Attached Images
File Type: jpg heatsinks.jpg (24.0 KB, 1005 views)
 
Old 26th September 2002, 08:47 PM   #6
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Cheers for the post - I'm awaiting a pricing from KAU, but I'm expecting it to be huge so I'll probably end up buying them.

I'll post again soon.

Cheers for the render

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Old 27th September 2002, 11:09 AM   #7
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Default They're black?!

Hi,
Sorry - missed the bit about them being black. If anyone is interested - I will redo the render accordingly! Just drop me a mail or post a request here.

Gaz
 
Old 28th September 2002, 12:18 AM   #8
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Yea, for best heat dissipation they should look like this......

Mark
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File Type: jpg heatsinksblack.jpg (26.8 KB, 929 views)
 
Old 29th September 2002, 12:10 PM   #9
Rarkov is offline Rarkov  England
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Hi,
Yep...or you could just reverse the colours! Quicker than how I was going to do it...(Change materials, Environment and re-render! )

Thanks,
Gaz
 
Old 3rd October 2002, 06:52 PM   #10
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I highly recommend dealing from this guy - I bought two of these heatsinks and paid via PayPal and they were at my house before 9 the next morning!

May I say a pleasure to deal with you - also if you ever have anything else laying around be sure to post on the forum and email me first .

If anyone has any queries buying goods over this forum I would happily reply emails with regards to the good service I received.

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