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Automatic Cooling Fan
Automatic Cooling Fan
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Old 15th March 2007, 04:12 AM   #1
hernanstafe is offline hernanstafe  Argentina
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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.
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Old 15th March 2007, 06:10 AM   #2
head_spaz is offline head_spaz  United States
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http://www.cpemma.co.uk/thermal.html
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Old 15th March 2007, 06:20 AM   #3
blip1882 is offline blip1882  United States
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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.
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Old 15th March 2007, 09:17 AM   #4
jan.didden is offline jan.didden  Europe
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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
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Old 15th March 2007, 10:12 AM   #5
pinkmouse is offline pinkmouse  Europe
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Automatic Cooling Fan
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.
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Old 15th March 2007, 10:25 AM   #6
jan.didden is offline jan.didden  Europe
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Much simpler & more elegant than mine!

Jan Didden
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Old 15th March 2007, 10:33 AM   #7
pinkmouse is offline pinkmouse  Europe
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Automatic Cooling Fan
Basically, I'm not clever enough to do proper designs!
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Old 15th March 2007, 12:41 PM   #8
AMV8 is offline AMV8  United Kingdom
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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
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Old 15th March 2007, 01:00 PM   #9
jackinnj is offline jackinnj  United States
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Automatic Cooling Fan
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.
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Old 15th March 2007, 02:11 PM   #10
hernanstafe is offline hernanstafe  Argentina
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first of all, thanks everyone for your replies, and pink mouse, what's the ic used in your circuit?

EDIT: LM317!! sorry!
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