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#272128 10-Jun-2020 15:37
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I'm looking for a large heat-sink to go on a speed controller for a belt grinder I'm making. The size is about 175mm x 110mm x 25mm.

 

 

I know there is always equipment being thrown out that have large heat-sinks so I would rather reclaim one from discarded equipment reducing waste than just buying a new one.

 

 

I'm based in Tauranga and get to Hamilton/Auckland every now and again.

 

 

Thanks.

 

Steve

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  #2502389 10-Jun-2020 16:39
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Older audio amplifiers have them. I'm sure there's lots of 80s amps hitting the landfill right now.

 

When all about recycling is said and done, there's also Jaycar.


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  #2502393 10-Jun-2020 16:52
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If these guys still exist they used to dismantle old electrical/IT equipment and had all sorts of heatsinks.

 

 

 

https://www.casa.co.nz/

 

 

 

Disclaimer, haven't been there since the 90's, and their website seems dated, but they used to deal in exactly what you describe :)


 
 
 
 




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  #2502403 10-Jun-2020 17:03
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Perfect thank you, just what I was looking for, they have a link to an online shop https://casamodularsystems.com/.

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  #2502463 10-Jun-2020 18:47
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There's nothing particularly magical about heatsinks. They're just lumps of metal (typically aluminium, copper is better) with a smooth face to maximize conduction from the IC, and vanes to maximize surface area to maximize heat transfer to the air. Worst case, make your own. You could even connect it to, or make it part of, the (I assume, metal) structure, so that the structure becomes part of the heatsink.

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  #2502817 11-Jun-2020 11:24
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Jaycar, Surplustronics used to sell largish heatsinks
https://www.jaycar.co.nz/black-heatsink-diecast/p/HH8555

 

There will be plenty on Trademe .

 


In the distant past Ive bought from a local Company selling extruded Alu, they just cut off what length I wanted .


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  #2502828 11-Jun-2020 11:55
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Can you buy from old computer recyclers?





Speedtest 2019-10-14


neb

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  #2502876 11-Jun-2020 13:16
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If you don't mind waiting, you can get them from the usual suspects in China quite cheaply. I got a bunch of them years ago for embedded systems use so unfortunately not useful for you, but cheap enough that I just got a whole batch to stockpile and use as required.

 
 
 
 


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  #2503347 12-Jun-2020 08:53
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I have a bunch of heatsinks you may use.

 

I have 1 each of the smaller, and 4 of the longer gold coloured one.

 

Click to see full size

 

Have hoarded for at least 20 years ... 😵





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  #2503572 12-Jun-2020 11:53
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Impressive! 2N3055's?



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  #2503762 12-Jun-2020 16:47
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SepticSceptic:

I have a bunch of heatsinks you may use.

 

I have 1 each of the smaller, and 4 of the longer gold coloured one.

 

 

 

Have sent you a PM.

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  #2503994 13-Jun-2020 11:22
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neb: Impressive! 2N3055's?

 

Nothing as mundane as the 2n3055's

 

Motorola / Signetics 7-4503, datecode 6920, 6922, 6933 - probably older than half of the Geekzoners :-)

 

Haven't been too successful in finding a datasheet, but haven't done too deep a dive.

 

These look like hitop TO-3's - none of this low profile TO-3 rubbish ...

 

Each Emitter pin connected to a 0.3R 1% 10W wirewound

 

AFAIR, these came from a 4v 75A linear regulator chassis, weighed near on 70Kg, and powered a DTL (diode transistor logic) minicomputer. I disassembled it years ago and kept the heatsinks. Things like electro's (8x 40,000uF, 15v - the size of a tall beercan) were ditched, and the transformer and chassis sent to the recyclers.





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  #2510184 23-Jun-2020 08:17
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Click to see full size

If anyone around Wellington wants this collection pm me. Standard AMD heatsink top right for scale.

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