Looking for heatsinks - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 14th June 2010, 01:43 PM   #1
diyAudio Member
 
Heisenberg's Avatar
 
Join Date: Jun 2010
Location: Las Vegas
Default Looking for heatsinks

I'm looking for a heatsink for an LM3886 guitar amp I'm planning on building.

Also it'd be nice to get some big ones that'd dissipate head really good for some TDA2030s.
  Reply With Quote
Old 14th June 2010, 04:12 PM   #2
diyAudio Member
 
jackand08's Avatar
 
Join Date: Oct 2008
Location: England
Depending on where you live, there are some good online retailers that sell some very good sized-and priced-heatsinks. One place to try would be Jaycar Electronics. They are from Australia but ship worldwide for a competitive price (if you don't mind having to wait for your goods). Another to try would be Farnell who also have an excellent range but are a bit higher priced compare to Jaycar when you consider what you are getting.

For a mono LM3886 amp, you would need a heatsink of no more than ~1C/W thermal resistance, but if you are planning to drive the amp hard (guitar use), then you would want a heatsink with no more than 0.75C/W thermal resistance (again for mono only).
  Reply With Quote
Old 15th June 2010, 12:19 AM   #3
diyAudio Member
 
Heisenberg's Avatar
 
Join Date: Jun 2010
Location: Las Vegas
thanks!
  Reply With Quote
Old 15th June 2010, 02:03 AM   #4
gootee is offline gootee  United States
diyAudio Member
 
Join Date: Nov 2006
Location: Indiana
Blog Entries: 1
There used to be a guy on ebay who sold really nice big extruded ones by the foot. You can also usually scrounge some decent ones from junk equipment. You could also check at places like Antique Electronic Supply (try Google). They also have a lot of other guitar-amp-related stuff. Sorry, I don't have either of the links handy. Maybe someone else will post them.

Last edited by gootee; 15th June 2010 at 02:06 AM.
  Reply With Quote
Old 15th June 2010, 02:32 AM   #5
diyAudio Member
 
Join Date: Oct 2005
Quote:
Originally Posted by gootee View Post
There used to be a guy on ebay who sold really nice big extruded ones by the foot.
He's still there. I saw him today. His seller name is barrredboss.

Looney
  Reply With Quote
Old 15th June 2010, 03:34 AM   #6
diyAudio Member
 
Heisenberg's Avatar
 
Join Date: Jun 2010
Location: Las Vegas
Eh, I'm kinda new to this, and I'm having trouble finding a heatsink with those charictaristics. I don't even really know what that stuff means. Or how to find one like that that'll fit the LM3886 or follow it's datasheets heat sinking specs. The sites I've looked through have like 2,000 different heatsinks to sort through.
  Reply With Quote
Old 15th June 2010, 03:35 AM   #7
diyAudio Member
 
Heisenberg's Avatar
 
Join Date: Jun 2010
Location: Las Vegas
gootee, I've looked at tubesandmore.com (antique electronic supply) for heatsinks and don't remember finding any heat sinks at all.
  Reply With Quote
Old 15th June 2010, 04:06 AM   #8
gootee is offline gootee  United States
diyAudio Member
 
Join Date: Nov 2006
Location: Indiana
Blog Entries: 1
Quote:
Originally Posted by Heisenberg View Post
gootee, I've looked at tubesandmore.com (antique electronic supply) for heatsinks and don't remember finding any heat sinks at all.
OK. But search for barrredboss on ebay.com. His stuff will do what you need!
  Reply With Quote
Old 15th June 2010, 06:14 AM   #9
diyAudio Member
 
jackand08's Avatar
 
Join Date: Oct 2008
Location: England
Quote:
Originally Posted by Heisenberg View Post
Eh, I'm kinda new to this, and I'm having trouble finding a heatsink with those charictaristics. I don't even really know what that stuff means. Or how to find one like that that'll fit the LM3886 or follow it's datasheets heat sinking specs. The sites I've looked through have like 2,000 different heatsinks to sort through.
The thermal resistance of a heatsink is the temperature rise that of the heatsink compared to the surrounding air temperature (ambient). For example, a heatsink with a 2C/W rating, this would mean that for every 1 watt of heat dissipated (from say, a transistor), the heatsink temperature will be 2C higher than the ambient temperature. A lower thermal resistance means that the heatsink can dissipate more heat but in the case of natural convection (i.e. not force cooled) heatsinks, this means that it will be much larger.

On Farnell's website, under the natural convection heatsinks, there should be a filter labelled "Thermal Resistance" (at least on the UK site there is). Underneath this, you can filter the 2000 or so heatsinks that the supply. When you've finished, just click on the "Show Results" button and that should bring up a much more refined selection of parts matching the criteria you specified.

If you would like to order from Jaycar, their heatsink catalogue no. HH8555 would be fine for an LM3886 amp and shouldn't get too hot if the amp was driven hard.
  Reply With Quote
Old 15th June 2010, 09:10 AM   #10
diyAudio Member
 
Heisenberg's Avatar
 
Join Date: Jun 2010
Location: Las Vegas
Thanks. I just ordered that one from Jaycar. Expensive.
  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
Intel CPU heatsinks as power output transistor heatsinks? deltavektor Solid State 4 29th November 2009 01:47 PM
Heatsinks Mark245 Parts 6 18th May 2009 01:11 AM
Heatsinks? tze-hao yen Pass Labs 3 12th March 2005 02:58 AM
Heatsinks josefr Solid State 5 14th April 2003 06:11 AM
Heatsinks woody Parts 17 18th August 2002 02:04 AM


New To Site? Need Help?

All times are GMT. The time now is 11:57 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