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Old 20th June 2015, 02:17 AM   #1
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Default Babysitter construction help

Thought one of these would be handy for this summer, thinking of these fans:

Amazon.com: Noctua SSO Bearing Fan Retail Cooling NF-P14s redux-1500 PWM: Computers & Accessories

or something similar. Would like advice on some type of controller, that would let sink get to certain temp and switch on-off maintaining optimum temp. I see several talking about these ideas over in Turbo F-5 thread, but no specifics. Would love to see some ideas.

This would prevent fan running on and on keeping sink below optimum temp...

Thanks for any direction,

Russellc
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Last edited by Russellc; 20th June 2015 at 02:19 AM.
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Old 20th June 2015, 02:23 AM   #2
Zen Mod is offline Zen Mod  Serbia
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LM317 , variable , and some time , using palm rule

either that , or arduino , home server , implementation in national security alert scheme etc.

sky is the limit
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Old 20th June 2015, 03:00 PM   #3
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Found a little surfing around your suggestion, found this:

Cooling fan temp controller | Make: DIY Projects, How-Tos, Electronics, Crafts and Ideas for Makers

http://www.heatsink.info/content.php...=control.shtml (click on "temp control")

I think a couple of these, (for a two fan babysitter) mounted in babysitter, heatsensor wire going through 5U cases perforated floor pan and then in contact with heatsink ought to do it.

Your first idea would work as well, I understand you mean to have a little 317 regulated power supply and just adjust fan speed to appropriate place for a given ambient temperature? Plus, this style would be a little easier to move from amp to amp...

I wondered about something similar to thermistor sensing heat on the F-5's mosfet, except something on heat sink. The link above has a link that I am still combing through.

I may be remembering wrong, but I think it was CanAm man that built a F-5 with some kind of temp control that operated fans, I may need to check with him or whoever that was.

Thanks,

Russellc
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Last edited by Russellc; 20th June 2015 at 03:20 PM.
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Old 20th June 2015, 05:11 PM   #4
Zen Mod is offline Zen Mod  Serbia
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do what your heart's wish is ..... but for Mighty Moi , simple LM317 circ is all I need
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Old 20th June 2015, 06:17 PM   #5
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Originally Posted by Zen Mod View Post
do what your heart's wish is ..... but for Mighty Moi , simple LM317 circ is all I need
I do have some 317 bits laying around from B-1 power supply build. keeping motor at lower rpm would make for most quiet.

Russellc
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Old 22nd June 2015, 09:58 AM   #6
WalterW is offline WalterW  Netherlands
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Or build a real Pass fan controller, with Mosfet of course
Attached Images
File Type: jpg 422055d1401867465-heatsink-f5t-fan.jpg (42.4 KB, 168 views)
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Old 22nd June 2015, 09:59 AM   #7
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yup



that's smart one - with turn on kick
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Old 22nd June 2015, 10:29 AM   #8
CeeVee is offline CeeVee  Portugal
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..or you can just use a dedicated IC:

http://www.datasheets.pl/integrated_...T/TC/TC642.pdf

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Old 22nd June 2015, 07:28 PM   #9
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Or build a real Pass fan controller, with Mosfet of course
I like this, is IRF like on my F-5 outputs too large of a mosfet? How small can it be? Obviously it must at least handle the draw of the fan...any one know what mosfet Pass labs uses for this position?

Russellc
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Old 22nd June 2015, 07:31 PM   #10
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size of IRF510

dissipation is negligible
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