Is this a proper heatsink for AV800 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 8th January 2011, 08:26 AM   #1
diyAudio Member
 
Join Date: Nov 2009
Location: Arges,Cutea De Arges
Default Is this a proper heatsink for AV800

I want to use this heatsink to built the AV800 and i want to know if it is big enough
Attached Images
File Type: jpg rsz_dsc03641.jpg (111.5 KB, 102 views)
  Reply With Quote
Old 8th January 2011, 09:13 AM   #2
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
what do the internal fins look like?
Is the fan working efficiently at pushing cold air through the sink tunnel?
__________________
regards Andrew T.
  Reply With Quote
Old 8th January 2011, 09:55 AM   #3
diyAudio Member
 
Join Date: Nov 2009
Location: Arges,Cutea De Arges
The efficiency of the fan is 50%,and here is a picture of the fins
Attached Images
File Type: jpg rsz_dsc03639.jpg (151.9 KB, 81 views)
  Reply With Quote
Old 8th January 2011, 10:36 AM   #4
diyAudio Member
 
Join Date: Jul 2008
Location: Lviv
I guess this is not a heatsink. It's more likely looks as a piece of granit rock to be used as heatsink!
Btw, good idea, considering high prices for precious metals, granit electrical non conductivity there is no need to use any kind of washer only thermal compound!
One thing left to calculate a formula of its thermal conductivity to obtain a C\W ratings.
__________________
If for pristine and pure adoration - it's diyAudio dedication!
  Reply With Quote
Old 8th January 2011, 10:49 AM   #5
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally Posted by radu8982 View Post
The efficiency of the fan is 50%,and here is a picture of the fins
are the fan blades clean? Are the sink fins clean?
Are the inlet and outlet ports clean?
Is the oil in the fan bearing clean and to specification?

Are you still sure about your cooling efficiency?
__________________
regards Andrew T.
  Reply With Quote
Old 8th January 2011, 10:57 AM   #6
diyAudio Member
 
Join Date: Jul 2008
Send a message via AIM to SpeakerScott Send a message via MSN to SpeakerScott Send a message via Yahoo to SpeakerScott
Find out what the thermal resistance of it is, both the Cordell and Slone book tell you how. Here's a quick answer:

Get known value power resistors, and clamp it well to the heatsink

Dissipate a known power in the resistor for a long period of time. For your heatsink, you'd want to use multiple resistors on both sides to distribute the power like you will when you bolt a lot of output transistors to it.

Measure the temperature rise of the heatsink over the course of a few hours. Calculate C/W rise using the measurements of rise and power.

Determine how much output power you think you'll dissipate in the AV800 stage.

Figure out if you can live with the temp rise you'll have.
__________________
http://speakerscott.tumblr.com/
  Reply With Quote
Old 8th January 2011, 12:02 PM   #7
diyAudio Member
 
Join Date: Nov 2009
Location: Arges,Cutea De Arges
I do not think I know how to calculate C/W and the other stuff and I dont have how to calculate them picose i didn built the amp ,i will built it but first i need to make some money,I have the transformer suply capacitors pcb.
  Reply With Quote
Old 8th January 2011, 12:39 PM   #8
diyAudio Member
 
Join Date: Nov 2009
Location: Arges,Cutea De Arges
For andrewT everyting is clean , i aproximated the eficency by comparing the power of the air flow when the fan is in the air and mounted
  Reply With Quote
Old 8th January 2011, 03:19 PM   #9
diyAudio Member
 
Join Date: Apr 2010
Location: Germany
I looked at specs from heat sinks that look similar and would guess this one could have something like 0.3 to 0.2 K/W which should be sufficient for an AV800 amplifier.
I'd give it a try.
Just my opinion.
  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
AV800 Amp Jitterbug Solid State 9 16th July 2010 10:14 AM
AV800 again :D dziundzis3 Solid State 0 26th November 2009 02:15 PM
av800 pcb need help!!!! ashokavarthanan Solid State 12 10th October 2007 01:12 AM
AV800 + clipping , etc ... darkm4n Solid State 14 24th September 2006 01:51 PM


New To Site? Need Help?

All times are GMT. The time now is 02:34 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