In need of a lrage heatsink for my chip amp, any ideas where to get one? - diyAudio
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Old 12th July 2010, 07:57 PM   #1
Boscoe is offline Boscoe  United Kingdom
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Default In need of a lrage heatsink for my chip amp, any ideas where to get one?

For my design of an enclosure which will be custom the heatsinks will make up the sides and then the top, bottom, front and back panels will be attached to them. The problem is I haven't been able to find any heatsinks the right size in the UK for a reasonable price. I need it in the style of the image below but need it 260mm long, 75mm high and 30mm thick, I don't want the extra ridges on the fins though and would prefer it in black. I also need it from the UK or europe at least.

Click the image to open in full size.


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Boscoe
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Old 12th July 2010, 09:34 PM   #2
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Boscoe -Oh you absolutly have to have it in UK or europe? Ill bet shipping won't be that bad. There is a guy who advertises in the manufacturers section of this froum HeatsinkUSA, llc . Now I haven't had any dealings with him, but it's a place to start. How much from vendors out your way, what does a thing like that cost? Do you have an idea what the weight would be?
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Old 13th July 2010, 11:01 AM   #3
AndrewT is offline AndrewT  Scotland
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That pic looks similar to a 200*100*50 heatsink I have. It is about 0.55C/W

That is very big for a chipamp.

Your 260*75*30 proposal is also very big for a chipamp.

What size does National say you should use for your implementation?

I recommend doubling National's guide figure.
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Old 13th July 2010, 11:12 AM   #4
Boscoe is offline Boscoe  United Kingdom
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It will be for 6 LM3886's and I meant 40mm depth, sorry typo.

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Old 13th July 2010, 11:14 AM   #5
AndrewT is offline AndrewT  Scotland
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what does National's guide say?
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Old 13th July 2010, 11:19 AM   #6
Boscoe is offline Boscoe  United Kingdom
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In the absoulute maximum ratings...........

Thermal Resistance:

θJC 1C/W
θJA 43C/W

Not quite sure waht this means though.
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Old 13th July 2010, 11:21 AM   #7
AndrewT is offline AndrewT  Scotland
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page 14.
Maximum Heatsink Thermal Resistance

Have you read and/or implemented that?
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Old 13th July 2010, 11:24 AM   #8
Mooly is offline Mooly  United Kingdom
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This is for Vellemans 200 watt amp,
VELLEMAN KIT|HSVM100|HEAT SINK FOR K8060 | CPC
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Old 13th July 2010, 11:34 AM   #9
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rather go for this one:

AAVID THERMALLOY | Semiconductors | Sockets and Heatsinks | Heat Sinks | Thermal Resistance - up to 1.3C/W |EM/B/75

MUCH more metal and biger than velleman for more or less the same price. I used two of them in my current build ( see picture thread)
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Old 13th July 2010, 12:54 PM   #10
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Qty2
250x150x30 1.3kg 8mm back panel.

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