Large Heatsinks anyone - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 21st April 2004, 03:11 PM   #1
Rixsta is offline Rixsta  United Kingdom
diyAudio Member
 
Join Date: Feb 2004
Location: Barrow-In-Furness, Cumbria
Send a message via Skype™ to Rixsta
Default Large Heatsinks anyone

just thought id let everone know theres a good deal for heatsinks on ebay

her you go

http://cgi.ebay.com/ws/eBayISAPI.dll...tem=3811135662

They dont ship outside the united states
  Reply With Quote
Old 21st April 2004, 05:34 PM   #2
Rixsta is offline Rixsta  United Kingdom
diyAudio Member
 
Join Date: Feb 2004
Location: Barrow-In-Furness, Cumbria
Send a message via Skype™ to Rixsta
oop's wrong link

http://search.ebay.com/ws/search/Sal...804&catref=C12

hows that
  Reply With Quote
Old 21st April 2004, 11:03 PM   #3
Gofer is offline Gofer  Netherlands
diyAudio Member
 
Join Date: Oct 2002
Location: Amsterdam
I think the base of the heatsink is to thin in this case.
  Reply With Quote
Old 21st April 2004, 11:10 PM   #4
Magura is offline Magura  Denmark
diyAudio Member
 
Magura's Avatar
 
Join Date: Oct 2003
Location: Denmark, Viborg
Default Too thin??

I guess those heatsinks can, just like 99% of the rest of the heatsinks on the market, benefit from a copper heat spreader. A nice 50 * 12 or 15mm busbar would do wonders for the component working temp.

This is though the usual (pretty trivial) post thats gonna be followed by somebody saying "ooohh yes, what a great idea"

To be followed by a post from somebody who have checked how much such a busbar is, saying "the benefit dosnt justify the cost, I will live with the less than optimal construction of a mosfet in the middle of the heatsink"

This is not to sound grumpy, just to save you guys some time and effort


Magura
__________________
Everything is possible....to do the impossible just takes a little while longer.
www.class-a-labs.com
  Reply With Quote
Old 21st April 2004, 11:21 PM   #5
Rixsta is offline Rixsta  United Kingdom
diyAudio Member
 
Join Date: Feb 2004
Location: Barrow-In-Furness, Cumbria
Send a message via Skype™ to Rixsta
Ok Cheers I wil bear this in mind if i become rich one day.. he he
But it's still a great idea and funily enogth someone who isn't a amp builder has basic understanding of electronics and who is in the field of computers surprised me today when he said put a copper strip on the heatsink.. lol
__________________
www.Rixsta.co.uk Free music recorded by me/DIY pics Currently Selling, amps=Zen V4, Zen-lightenment‎, Jean Hiraga 20w, F5, F5T
  Reply With Quote
Old 21st April 2004, 11:24 PM   #6
Rixsta is offline Rixsta  United Kingdom
diyAudio Member
 
Join Date: Feb 2004
Location: Barrow-In-Furness, Cumbria
Send a message via Skype™ to Rixsta
Quote:
Originally posted by Gofer
I think the base of the heatsink is to thin in this case.
it looks ok to me but then agan iv'e not much experiance in all things electrical.. although iv'e mucked around with it scince the age of 8.

the picture isn't very bright
Did you check the side veiw picture of the sink ?
__________________
www.Rixsta.co.uk Free music recorded by me/DIY pics Currently Selling, amps=Zen V4, Zen-lightenment‎, Jean Hiraga 20w, F5, F5T
  Reply With Quote
Old 21st April 2004, 11:27 PM   #7
Magura is offline Magura  Denmark
diyAudio Member
 
Magura's Avatar
 
Join Date: Oct 2003
Location: Denmark, Viborg
Its used in many other applications, he may have seen is among the overclockers or the like.

The idea is great... nothing less, but usually it turns out that you will only use such an approach for smaller applications because of the cost. The heaatspreader approach is too expensive for anything as big as an amp. Ive made a few tests with this approach for very big heatsinks like the ones in question, and the performance is second to none with the adequate amount of copper attached. But to really make it kick ***, you need to cover most of the base with a copper plate at least 15% the thickness of the lenght of the heatsink....a pricy game

Magura
__________________
Everything is possible....to do the impossible just takes a little while longer.
www.class-a-labs.com
  Reply With Quote
Old 21st April 2004, 11:33 PM   #8
Rixsta is offline Rixsta  United Kingdom
diyAudio Member
 
Join Date: Feb 2004
Location: Barrow-In-Furness, Cumbria
Send a message via Skype™ to Rixsta
Oooooo Cool Stuff

My freind likes to overclock so you got it right there.


Quote:
Originally posted by Magura

The heaatspreader approach is too expensive for anything as big as an amp.

Magura
Let alone a class a amp with massively massive sinks.......lol
__________________
www.Rixsta.co.uk Free music recorded by me/DIY pics Currently Selling, amps=Zen V4, Zen-lightenment‎, Jean Hiraga 20w, F5, F5T
  Reply With Quote
Old 21st April 2004, 11:52 PM   #9
Magura is offline Magura  Denmark
diyAudio Member
 
Magura's Avatar
 
Join Date: Oct 2003
Location: Denmark, Viborg
Quote:
Originally posted by Rixsta

Let alone a class a amp with massively massive sinks.......lol

The reason for making those tests was to determine the relation between thickness of copper bar and how far the heat would travel quick enough to make any difference in the end....so that I can implement it in my amp project.

Gonna mount mosfets on 80*120*12mm bus bars.

Magura
__________________
Everything is possible....to do the impossible just takes a little while longer.
www.class-a-labs.com
  Reply With Quote
Old 27th April 2004, 02:40 PM   #10
diyAudio Member
 
Matttcattt's Avatar
 
Join Date: Feb 2003
Location: Bristol
How good to these heatsinks look?

I am sortof looking for some with these dimentions, and 20 for a two foot length looks cool.

I dont know how this price compares to other stuff i would be able to get in the UK, but looking at most companies they have a minimum order of like 50 and I only need 2 or 4.

[edit]: He wont ship to the UK. damn.
__________________
If it aint broke, don't fix it. If it is broke, fix it.
If you can't fix it, take it apart and see how it "worked".
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
FS: 4 large heatsinks Killjoy99 Swap Meet 6 3rd April 2008 01:24 AM
How to cut large heatsinks? bobgroger Solid State 7 31st January 2008 08:54 PM
FS: Large Heatsinks Bakmeel Swap Meet 3 17th October 2006 05:58 PM
FS:4 large heatsinks 0.3K/W Thomas Swap Meet 0 10th October 2005 10:01 PM


New To Site? Need Help?

All times are GMT. The time now is 03:43 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2