Circuit generates fan-speed control

Posted on Jun 9, 2012

Fan noise is becoming a significant issue as electronic equipment increasingly enters the office and the home. Noise is proportional to fan speed, and the airflowhence, fan speednecessary for cooling is less at low ambient temperatures. Because ambient temperature is lower than the upper design point most of the time, a fan can run slower, making it easier on the ears. Fan-control circuits range from simple switches that boost the speed from low to high, to digital, proportional speed-control designs.

High/low-speed switches are inexpensive, but the sound of sudden speed changes can be annoying. Digitally controlled fans perform well, but the circuitry is costly, and the system must include a serial bus. As an alternative, consider a low-cost, self-con

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