More about reducing the fan speed. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Computers
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In the article "Fan on video card"(" Radio ", 2002, No. 7, p. 30) D. Turchinsky recommends that, in order to reduce the rotational speed (and with it the noise level) of the fan, a quenching resistor shunted by a capacitor is connected in series to its power circuit.
But the problem can be solved in a simpler way, without any additional details. The fact is that between the +12 and +5 V buses in the computer power supply there is a potential difference of about 7 V.
As practice has shown, this voltage is optimal for a 12-volt fan with a DC motor - it starts reliably and operates at about half its capacity. Thus, it is enough to make a connector for connecting a fan to a free power output intended for peripheral devices such as a hard drive or CD-ROM drive.
In the standard version, the fan wires are connected to the yellow and black conductors, and to obtain a reduced voltage, it is connected to the yellow and red wires (the positive - usually red - fan wire is connected to the yellow).
Author: A.Sirosh, Kiev, Ukraine
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