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Old 12-19-2007, 07:41 PM   #1
redtail28
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Default Stir plate question

I found an 120v fan that I would like to make stir plate. Can i use a dimmer switch
from wal mart to controll the fans speed?


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Old 12-19-2007, 08:57 PM   #2
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I've had mixed success with dimmers & fans. Some fans work well and you'll get a good speed range. Others it's not much better than on/off.


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Old 12-19-2007, 09:40 PM   #3
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IIRC, most of those dimmer switches work by chopping parts out of the sine wave being sent to the bulb. That can't be good for the motor, but it may work.
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Old 12-19-2007, 10:07 PM   #4
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I use a Radio Shack rheostat, which is a dimmer, without any problems.
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Old 12-19-2007, 10:17 PM   #5
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A rheostat can work, as long as it can take the heat. You're running the entire current through the resistance path of the rheostat, so it can be a significant amount of heat, too, which is why the dimmer switches at Wal-Mart the OP referred to don't do it this way. I don't know how efficient those AC fan motors are, but if they draw any significant amount of current, you could burn up a rheostat pretty quick.
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Old 12-29-2007, 05:14 AM   #6
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Dc is the best imho


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