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 Post subject: Home made smart fan controller
PostPosted: Tue Jan 07, 2003 4:54 pm 
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Joined: Fri Oct 25, 2002 5:46 pm
Posts: 24
Location: Trenton, NJ
I want something that turns on fans when a certain temperature is reached and gradually speeds up till full load at another temerature. Has this been done? The fanstorm kit seems to do this, but I am a bit short on cash :oops: and wife would never approve it.


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 Post subject:
PostPosted: Tue Jan 07, 2003 9:21 pm 
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Joined: Mon Oct 21, 2002 1:01 am
Posts: 543
Location: Vancouver, BC, Canada
Another discussion here http://forums.silentpcreview.com/forums/viewtopic.php?t=2511
already has some info and links to diagrams of some fan control circuits.

Happy modding!

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 Post subject:
PostPosted: Wed Jan 08, 2003 5:05 am 
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Joined: Sun Aug 11, 2002 3:26 pm
Posts: 262
Location: Worcester, UK
Ive built one of the ones from heatsink-guide, and its very good. Only costs around £2 (~$2 or $3), and you can set the temperature sensitivity. From personal experience, dont use with papsts which click; if the voltage supplied is just below the start up voltage they will click like crazy!

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 Post subject: variable?
PostPosted: Wed Jan 15, 2003 3:56 pm 
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Joined: Mon Jan 13, 2003 8:34 am
Posts: 22
Location: MN
Does this controller (the simpler one described at heatsink-guide) vary the speed between starting and max, or is it a simple on-off? It wasn't clear to me from the description.

Thanks.


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 Post subject:
PostPosted: Wed Jan 15, 2003 11:53 pm 
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Joined: Sun Aug 11, 2002 3:26 pm
Posts: 86
Location: Falun, Sweden
I have a home-build temperature sensitive quadruple fan controller:
Image

Basic design here:
http://vodka.tky.hut.fi/~jap/Electronics/FanCtrl/
(It's also in the LM317 datasheet along with other fun stuff you can build with it.)

It will not turn on the fans or so, but it will vary the voltage depending on temperature. You don't need the capacitors, they probably do something good in a sensitive environment, but the 12V lines in a computer nor the fans are that sensitive.
The LM317 can handle 1A (=6W at 6V, or 11W at 11V), IIRC. If you use bigger fans, you will need to work with power transistors and stuff.


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 Post subject: Re: variable?
PostPosted: Thu Jan 16, 2003 5:01 am 
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Joined: Sun Aug 11, 2002 3:26 pm
Posts: 262
Location: Worcester, UK
clamrade wrote:
Does this controller (the simpler one described at heatsink-guide) vary the speed between starting and max, or is it a simple on-off? It wasn't clear to me from the description.

Thanks.


The one at heatsink guide varies the voltage continuously from startup to max voltage.

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