C Section Purlongs used as heat sinks - 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 26th July 2005, 12:16 PM   #1
diyAudio Member
 
John Biles's Avatar
 
Join Date: May 2005
Location: Victoria Australia
Lightbulb C Section Purlongs used as heat sinks

as i had some 52mm x 150mm "C" Sections laying around i decided to see if i could used them to make heat sinks for my amplifier project.

i decided to build a john Hood 10W class A amplifier and found that if i used a piece of "C" Section 800mm long with 6 2N3055 transistors evenly space the transistor case temp only got to 45 degrees C in a room with a temp of 25 degrees C

this was with a supply voltage of 28volts and the current set to 1.4amps

from this i plan to build a amplifier using "C" Section stanging up back to back to form a towel giving the amp a different look
  Reply With Quote
Old 27th July 2005, 03:38 AM   #2
diyAudio Member
 
John Biles's Avatar
 
Join Date: May 2005
Location: Victoria Australia
to save money, what else have you been using for heat sinks on your projects.

Also "C" Section allow you to build cheap strong amplifier cases, as all you have to do is join 4 pieces of "C" Section to the size you want cut at 45 degrees with right angle brackets, screw a flat piece of metal on the top and bottom and you have you case.
you can get 50mm x 75mm "C" section.
you can get 52mm x 150mm section or bigger.

i only paid $3 a metre second hand for my 52mm x 150mm, so i can build my Amplifier case for around $20 and it's alot stronger than the cases you buy from suppliers.
Paint it black and add a Aluminum front and your done, easy!
  Reply With Quote
Old 29th July 2005, 08:15 AM   #3
diyAudio Member
 
John Biles's Avatar
 
Join Date: May 2005
Location: Victoria Australia
here's some pics using a "C" Section as a heatsink.
3 transistors in parallel for each power transistor of the JLH 10watt Class A amplifier. Works Well at 25 degree room temp.
transistors only get to 45 degrees case temp
  Reply With Quote
Old 29th July 2005, 08:17 AM   #4
diyAudio Member
 
John Biles's Avatar
 
Join Date: May 2005
Location: Victoria Australia
pics
Attached Images
File Type: jpg tn_p1010006.jpg (39.0 KB, 82 views)
  Reply With Quote
Old 29th July 2005, 08:20 AM   #5
diyAudio Member
 
John Biles's Avatar
 
Join Date: May 2005
Location: Victoria Australia
more pics
Attached Images
File Type: jpg tn_p1010010.jpg (40.2 KB, 73 views)
  Reply With Quote
Old 29th July 2005, 09:51 AM   #6
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default This is really interesting John...but...i am sorry to say, that i am afraid

That the heat conduction speed.... heat transference speed, is not so good, as this kind of aluminium, called duraluminiun, hard aluminium, is a result of metal mixing to improove mechanical resistance.

You will perceive that you will have hot point around transistor, and cold points distant of it.

Resulting a not so good heatsink.

Despite of that, i had used it many times...this is diy, the spirit!, and i think was interesting you publish that.

regards,

Carlos
__________________
DxS, the best from the best...the cream from the cream, the best wide world ever made audio amplifier.
  Reply With Quote
Old 29th July 2005, 09:57 AM   #7
diyAudio Member
 
John Biles's Avatar
 
Join Date: May 2005
Location: Victoria Australia
Hello Distroyer X,
even worst, the stuff is made from steel not aluminum.
I have run my JLH CLass A 10watt Amp for hours and the temp stayed the same?
One thing for why it might have worked was that i was powering the amp with 28volt rails and not 40volts as is the norm.
same ampage levels 1.3amps.
  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
Big heat sinks AR2 Swap Meet 0 30th December 2006 07:51 AM
where do you get your heat sinks ? percy Chip Amps 12 16th August 2005 07:00 PM
Heat Sinks for TO-220 and TO-247 Dick West Swap Meet 0 23rd March 2005 11:23 PM
Heat sinks - going the other way jackinnj Everything Else 9 27th April 2003 05:01 PM
Big Heat Sinks dshortt9 Parts 15 4th November 2002 07:36 PM


New To Site? Need Help?

All times are GMT. The time now is 11:06 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