fabulous deal on chipamp 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 15th January 2005, 02:29 PM   #1
diyAudio Member
 
Join Date: May 2004
Location: Southwest Michigan
Default fabulous deal on chipamp heatsinks!!!

I just found the perfect, very affordable heatsink assembly for amps using LM3875 or LM3876.

MCM in Ohio has a computer heatsink cube with a copper insert, plus a 12vDC fan attached to it for $5!!!!!!!!!!!!!

Go to www.mcminone.com, look up their part # 83-10371.

I bought one yesterday for a sample, now I'm back for a quantity!
__________________
As for me and my household, we shall serve the Lord. Joshua
  Reply With Quote
Old 15th January 2005, 03:07 PM   #2
tommak is offline tommak  United States
diyAudio Member
 
Join Date: Jun 2003
Location: Raleigh, NC
Default Take the comma off the end of the link.

If you click on the link above, it doesn't work, due to the attached comma "," at the end.
  Reply With Quote
Old 15th January 2005, 03:13 PM   #3
diyAudio Member
 
Join Date: May 2004
Location: Southwest Michigan
Default oops, I'm an idiot

www.mcminone.com
__________________
As for me and my household, we shall serve the Lord. Joshua
  Reply With Quote
Old 15th January 2005, 03:35 PM   #4
markp is offline markp  United States
diyAudio Member
 
Join Date: Oct 2003
Location: L.A., CA
That should be good for about 75 watts as the AMD cpu is a little over 75 watts with a temperature of ~45C.
__________________
If it sounds good... it is good!
  Reply With Quote
Old 15th January 2005, 04:17 PM   #5
diyAudio Member
 
demogorgon's Avatar
 
Join Date: Jul 2004
Location: Behind you.
Send a message via MSN to demogorgon
would you know..

i actually own one of theese.. the only problem with computer heatsinks is that they have to have a fan on them, because the fins are too close to eatch other to allow a good airflow through them.

and i like the sound of good music better than the sound of a irritating buzzing fan. not to nemption that computer fans near audio equipment tend to make their precense know trough your speakers a well. i have large problems with this in my room as the computer and amp is lying about 30-35 cm away from each other, and i use a lot of fans..
  Reply With Quote
Old 15th January 2005, 09:53 PM   #6
zBuff is offline zBuff  New Zealand
diyAudio Member
 
Join Date: Nov 2004
Location: NZ
I was going to use CPU heatsinks for my chipamp heatsinks also, I've got labout 10 extra heatsinks lying around since I've built quite a few small form factor cases, which always have there own cooling components.

Demogorgon, so do u think CPU heatsinks aren't very appropriate, does convection heat dissipation not work very well with them because of the small fin spacing distance?

I wasn't intending on using fans on mine in any case.

Another problem that could occur is resonance with such small fin sizing.

From what I've seen of other ppls chipamps the heat dissipation qualities of a CPU heatsink should be plenty.

What is the optimal operating temperature of these chips anyway? I tried looking over the LM3875 datasheet to no avail. Maximum temperature of 165 C is pretty damn high when the thermal cutoff kicks in.
  Reply With Quote
Old 15th January 2005, 11:27 PM   #7
diyAudio Member
 
demogorgon's Avatar
 
Join Date: Jul 2004
Location: Behind you.
Send a message via MSN to demogorgon
zBuff: yes, that is exactly what i mean. i know from having tested computer heatsinks with passive cooling before.

and note altso that all heatsinks not meant for having fans on them have dramaticly more distance between the finns.
  Reply With Quote
Old 17th January 2005, 05:22 PM   #8
azira is offline azira  United States
diyAudio Member
 
Join Date: Dec 2003
Location: Near Seattle
I used a Foxconn heatsink that looked almost exactly like this for my Zen amp which dissipates about 50-watts idleing. One really cool 'feature' of this heatsink is the integrated heat spreader which is screwed in place. If you remove it and keep the screws you have built in mounting holes for your chips that should be just about at the perfect distance for pin clearance. You could probably mount 4 channels on one heatsink with no issues. Undervoltage the fan and it should be fairly quiet although not -dead- quiet.
--
Danny
  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
What a Deal! jkeny Tubes / Valves 3 25th March 2009 09:36 PM
Best ESL deal? bjackson Planars & Exotics 8 13th November 2005 02:51 PM
VCR's Better Deal than Ever? haldor Everything Else 7 19th January 2002 04:07 AM


New To Site? Need Help?

All times are GMT. The time now is 12:53 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