Automatic Cooling Fan - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

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 March 2007, 04:12 AM   #1
diyAudio Member
 
Join Date: Feb 2007
Location: Argentina
Default Automatic Cooling Fan

Anyone has an idea of the circuit for an automatic cooling fan? i mean that it turns on automatically when a sensor reaches certain temp...and i heard there are some that even change speed according to the temp, but i can't find schematics! i found something using tl88, but the datasheet doesn't say much.
  Reply With Quote
Old 15th March 2007, 06:10 AM   #2
diyAudio Member
 
Join Date: Mar 2004
Location: Arkansas
http://www.cpemma.co.uk/thermal.html
__________________
Writing is good exercize for the texticles!
  Reply With Quote
Old 15th March 2007, 06:20 AM   #3
diyAudio Member
 
Join Date: Sep 2005
Another option is to use a PIC (or PICAXE or Basic STAMP) which provides you with a lot of control options etc. The code and circuit would be pretty trivial if you have any programing skills.
  Reply With Quote
Old 15th March 2007, 09:17 AM   #4
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
Default Re: Automatic Cooling Fan

Quote:
Originally posted by hernanstafe
Anyone has an idea of the circuit for an automatic cooling fan? i mean that it turns on automatically when a sensor reaches certain temp...and i heard there are some that even change speed according to the temp, but i can't find schematics! i found something using tl88, but the datasheet doesn't say much.

I published an article with a 4-speed temp fan control in Audio Amateur, I think early 80-ies. You may want to look it up at www.audioxpress.com .

Jan Didden
__________________
If you don't change your beliefs, your life will be like this forever. Is that good news? - W. S. Maugham
Check out Linear Audio!
  Reply With Quote
Old 15th March 2007, 10:12 AM   #5
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
Just about as simple as you can get.

http://www.diyaudio.com/forums/showt...993#post652993

edit: I just noticed you want one that turns off, mine is a variable speed one that never actually turns off.
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 15th March 2007, 10:25 AM   #6
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
Much simpler & more elegant than mine!

Jan Didden
__________________
If you don't change your beliefs, your life will be like this forever. Is that good news? - W. S. Maugham
Check out Linear Audio!
  Reply With Quote
Old 15th March 2007, 10:33 AM   #7
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
Basically, I'm not clever enough to do proper designs!
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 15th March 2007, 12:41 PM   #8
AMV8 is offline AMV8  United Kingdom
diyAudio Member
 
Join Date: Jan 2005
Location: near london
Hi hernanstafe

I use 12v cooling fans that operate from a 7812 voltage regulator. Or, if you want it to go slower use a 7809 regulator. I connect a temperature sensor into the fan supply circuit and set the sensor on the heatsink set at around 55 degrees.

I normally use one fan - at least - per heatsink.

I do not think you can get much simpler.

Don
  Reply With Quote
Old 15th March 2007, 01:00 PM   #9
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
I used the SG3525 PWM chip -- you can use the error amplifier to control the speed (Nat Semi had an application note on this) -- the SG3525 will source or sink 500mA so there's no need of a switching transistor.
  Reply With Quote
Old 15th March 2007, 02:11 PM   #10
diyAudio Member
 
Join Date: Feb 2007
Location: Argentina
first of all, thanks everyone for your replies, and pink mouse, what's the ic used in your circuit?

EDIT: LM317!! sorry!
  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
Automatic poweramp start A 8 Solid State 14 3rd January 2010 03:27 PM
mic preamp automatic gain checko_garcia Instruments and Amps 6 10th May 2008 05:29 PM
semi-automatic turntable? djfake Analogue Source 6 2nd March 2008 12:08 PM
audio switch automatic palmmed Everything Else 3 18th March 2006 11:53 PM
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 11:04 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