Amp Cooling - 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 7th November 2008, 04:12 PM   #1
SxiCj08 is offline SxiCj08  United Kingdom
diyAudio Member
 
Join Date: Nov 2008
Smile Amp Cooling

Hi There My Fellow Forum Users Just a Quick Question My Amp Gets Rather Hot When Playing For Some Time I Was Just Wondering Can I Install Pc Fans To Keep The Temp Down If So How Would I go About Installing Them And What Size Fan Should I Get Cheers Click the image to open in full size.
  Reply With Quote
Old 7th November 2008, 04:22 PM   #2
albin is offline albin  United Kingdom
diyAudio Member
 
Join Date: Aug 2008
Default hot amp

hi there
Fans are noisy,why not make a chimney for it.
regards
max
  Reply With Quote
Old 7th November 2008, 04:28 PM   #3
diyAudio Member
 
ostripper's Avatar
 
Join Date: May 2008
Location: Albany , NY (smallbany)
Get greenlee 3/4 inch hole punch set or ramp up to at least
2 rows of 1/2 inch holes underneath heatsink (6-8 3/4 " or
2 rows of 10 - 1/2") above and below heatsink.
Convection should keep it cool.

What amp is that?? ..,2- lm3886's?
  Reply With Quote
Old 7th November 2008, 05:29 PM   #4
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
cut a big slot to match the plan area of the heatsink in the floor of the chassis and a matching one in the top plate.
The sink will block of the bottom slot, add a mesh to the top slot to prevent fingers items getting in.
__________________
regards Andrew T.
  Reply With Quote
Old 7th November 2008, 05:41 PM   #5
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Can you draw equations of your thermal system?
It is a differential equation with many variables (I humbly suppose), if to draw one in some tolerances in mind.
The aim is to keep Vbe of output transistors stable, right?
How do you measure it? How do you compensate it? This is the question. Any real thermo-feedback system have delays. And in order to work it needs some gain. So, the task is very usual, but time constants are different, and methods to calculate them differs.

Good luck!

Edit: The task is impossible. You will aways get bad results.
I've been there, done that. Giving up too complex mathematic modeling I used an infrared camera, and decided that it is better to heat controllably devices instead of regulating them. But after building a prototype I decided to give up the entire idea of complementary emitter followers. It is a dead idea, though it is very popular.

Edit again: there are empirical formulas exist. You may keep temperature of the whole heatsink roundly using such formulas. The result will be average. But what you need actually, shorter time delays. One mostly significant delay may be reduced by a forced air, however here noise level start playing.
Also, Grasgoff & Prantle criterion is significant in such empirical engineering. Google all around it.



__________________
"Our youth [...] have bad manners, contempt for authority; they show disrespect for their elders, contradict their parents, [...] and tyrannize their teachers. -- Plato, 447-367 BCE
  Reply With Quote
Old 7th November 2008, 06:42 PM   #6
jaycee is offline jaycee  United Kingdom
diyAudio Member
 
Join Date: Apr 2004
Location: Norwich, UK
More details needed Is this a self build ? If so where did you get that case from?

I'm assuming this uses LM3876/3886 or similar. With that size heatsink it should run quite cool. I think the main thing you need to do is create ventilation holes in the case above and below the heatsink as suggested.
  Reply With Quote
Old 7th November 2008, 10:06 PM   #7
SxiCj08 is offline SxiCj08  United Kingdom
diyAudio Member
 
Join Date: Nov 2008
its a acoustic solutions sp101
  Reply With Quote
Old 7th November 2008, 10:07 PM   #8
jaycee is offline jaycee  United Kingdom
diyAudio Member
 
Join Date: Apr 2004
Location: Norwich, UK
Oh why am I not surprised. Let me guess, bought from Argos? (edit: thought of the wrong seller!!)

They already have a vent in the top. I would second AndrewT's idea - remove the main PCB + heatsink, and cut a hole in the base where the heatsink would be.

Honestly though, these things are exactly what you pay for, cheap pieces of junk, built with cheap parts in some chinese factory somewhere.
  Reply With Quote
Old 8th November 2008, 12:40 PM   #9
SxiCj08 is offline SxiCj08  United Kingdom
diyAudio Member
 
Join Date: Nov 2008
I Fink It Does The Job Well.
  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
air cooling karma Pass Labs 8 11th March 2003 04:54 AM
Cooling an amp with poor cooling BAM Solid State 8 31st December 2001 04:40 AM


New To Site? Need Help?

All times are GMT. The time now is 09:50 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