Who needs software control when you can roll your own fan controller?

Subject: Cases and Cooling | August 18, 2011 - 05:56 PM |
Tagged: fan controller, pwm, DIY

Even with the fancy drivers now that allow you to set a minimum fan speed you will find that it is almost impossible to completely turn the fan off.  If you desire to do so, it is almost impossible to turn the fan completely off, which is something that is almost impossible with either a software solution or with a PWM controller.  Over at Hack a Day you can find instructions on how to create a breadboard project which translates PWM signal to DC and will allow you much greater control over your fan speed.

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"[hedgehoginventions] wrote in to share a little modification he made to his video card in order to keep it from overheating during strenuous 3D tasks. Having swapped out the stock cooler on his Nvidia 9600GT graphics card, he found that it did not need to utilize the fan while doing mundane things like checking email, but that it still required extra air flow while playing games.

He figured he get the fan to shut off by tweaking the PWM signal, but he found that he could not get the duty cycle under 20% using software, which still caused the fan to run at all times. The circuit he built takes the PWM signal output by the card, cleaning it up before converting it to a corresponding DC voltage. The fan then runs at the same speed it would if driven directly by the PWM signal, though it can now turn off completely when not required."

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Source: Hack a Day

August 18, 2011 | 09:07 PM - Posted by JSL

Last I remember, when using speedfan, if I bring the % to zero, the fan stops, and testing with a voltmeter, the power level is at 0 as well. (well, .00011mA/.00002v)