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Old 11-20-2010, 11:51 PM   #1
yerffejecarb
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Default Stir Plate Fan Question

I am trying to build a stir plate with a case fan, but my fan has 4 wires. It is a Dell and has Black, Red, White, and Blue wires. I tried connecting the black and red to my power supply and nothing happened.

Any thoughts? Anyone ever use a similar case fan for a stir plate?

Thanks!


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Old 11-21-2010, 05:06 AM   #2
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I built one using a new 120mm fan from a local IT shop, and it had 3 wires - red, black and yellow. The red was hot, black was ground, and the yellow was for RPM control. Not sure what a 4th one would be. What type of connector was at the end? Molex, or a mobo 3 pin fan connector?


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Old 11-21-2010, 05:16 AM   #3
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my fan has 4 wires black red blue and yellow. i just hooked up the black and the red. 1 make sure the poliraty is right i hooked up mine backwords and it dident spin and 2 i was trying to underpower mine ( dident know it at the time the fan was 12 volts and i was trying to use 6 )and it would not start spinning on its own i had to give it a push to get it to spin. after i used a 12 volt supply it satarted to spin on its own when i turned it on. that was the problems i had i hope they help you
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Old 11-22-2010, 01:23 PM   #4
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It sounds pretty similar to the fan that I used for my stir plate. Make sure your hot and ground polarity is correct. The other two seemed to be an RPM wire and a sensor wire. By shorting those two, I'm able to adjust the fan speeds from low to high. I just used a simple toggle switch for that function. I still used the rheostat to make fine adjustments, but by adding that switch I have a much greater speed range.
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Old 11-22-2010, 07:45 PM   #5
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What current draw/amps are listed on the ones you are using? I have some low wattage fans and I'm not sure they will do the job...
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Old 11-22-2010, 07:57 PM   #6
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I hooked up a fan that had only red and black wires and it ran fine. The fan is a 12vDC and power supply is only a 6 volt cell phone charger. I am just going to use the fan with 2 wires and throw the 4 wire one back in the scrap parts bin. Thanks for the replies.
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Old 11-22-2010, 09:21 PM   #7
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If you go to the Project Locator, one of the stir plate builds tells you what to do with the 4 wire ones.


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