RSSCooling fan temp controller
How to create a temperature controller for a CPU cooling fan (or similar cooling fan for other electronics) only a few bucks and a handful of parts.
Build yourself a fan temperature control [via]
Posted by Gareth Branwyn |
Apr 25, 2008 04:57 PM
DIY Projects, Electronics |
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Comments
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| Posted by: Michael Covington on April 26, 2008 at 1:16 PM |
The MOSFET dissipates no heat when it is fully "off" or "on." However, in theory, there is a temperature at which the MOSFET will be "half on" and will dissipate heat. How much current does the fan draw under that condition? Is a heat sink needed?
| Posted by: Don Hersey on April 27, 2008 at 10:37 PM |
Yup, Michael C, you are correctly alluding to a weakness in this design. Properly realized, this circuit would include a comparator (w/hysteresis) to make sure the mosfet is truly switched. mosfets have a great deal of process spread, so this is not a 'good circuit.'
Without wanting to come off as a latent jerk, it wouldn't kill a person to read a few books on electronic design. Fairchild's op amp hand book, the Art of Electronics, ARRL pubs, something!
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