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Old 01-20-2011, 05:34 PM   #1
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Default Stirplate - 12v too much, 6v won't turn it on???

I put together a stir plate last night. Have tried 2 different 6v power adapters (cell phone chargers) and they won't turn the 80m comp. fan even when it's straight from the wall. 12v turns it fine. I hooked it all up and it's wayyy to fast. Dialed all the way down and the vortex is much too high.

Why won't the 6v charger do anything? Doesn't even sound like it's getting juice.

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Old 01-20-2011, 06:17 PM   #2
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What voltage is the fan rated for? And what instructions are you following?

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Old 01-20-2011, 08:08 PM   #3
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With the 12v can you just add a resistor? (I'm an accountant, not an electrical engineer so sorry if this is a dumb question.)

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Old 01-20-2011, 08:17 PM   #4
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Pick up a variable wall-wart power supply from wally world. They are cheap, and have a 7.5v position. That should work.

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Old 01-20-2011, 08:38 PM   #5
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you can pick up a rheostat from radio shack. its an adjuster that you can turn the knob and it'll do the job for ya. you'll just have to in-case the whole thing to make everything easier

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Old 01-20-2011, 08:45 PM   #6
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Are your magnets right on the fan?? mine would not turn when the magnets were glued to the fan. I put a 1/2 inch spacer between the magnets and the fan and worked great at 6v.

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Old 01-20-2011, 08:57 PM   #7
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Have you swapped the polarities and tried it? That was a nasty little surprise I had when I soldered mine together drunkenly at 1am. I got mad and went to bed. In the morning I swapped the wires and all was good. Honestly, who figured? I'm just covering the very basics first.

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Old 01-20-2011, 10:21 PM   #8
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Quote:
Originally Posted by sakeyfour View Post
Are your magnets right on the fan?? mine would not turn when the magnets were glued to the fan. I put a 1/2 inch spacer between the magnets and the fan and worked great at 6v.
Not sure this is your issue but I too had to put a spacer between the fan and the magnet...damn powerful little thing wouldn't let the fan spin!
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Old 01-20-2011, 10:23 PM   #9
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OK...got it. Thanks for all the replies. I ended up with 9v. Works good, but still too powerful unless it's at least 1.5L. I do have a rheostat, all the way turned down.

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Old 01-20-2011, 10:47 PM   #10
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Quote:
Originally Posted by Kayos View Post
OK...got it. Thanks for all the replies. I ended up with 9v. Works good, but still too powerful unless it's at least 1.5L. I do have a rheostat, all the way turned down.
If when it's turned down all the way the motor still turns you have it wired wrong.
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