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Home Brew Forums > Home Brewing Beer > DIY Projects > Chillers and Stir Plates > DIY Stirplate help
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Old 06-09-2009, 08:25 PM   #11
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Remove the magnet from the fan and see if it spins. I had to put the magnet on standoffs so that it didn't interfere with the motor.
I do not have a magnet on the fan yet. I didnt want to hook it up until i knew the assembly worked.

Yes its the big 12v case fan
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Old 06-09-2009, 08:38 PM   #12
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in that case, all I can say is give it some more voltage. some older cell phone chargers were around 7.2 volts-ish. have one of those around? Alternatively, if you are feeling sparky, you could pick up a variable voltage regulator (it's a cheap, 3 pin "chip") at radioshack, pick up an assortment of resistors, and follow the wiring diagram on the package to try out various voltages. You'll need a supply voltage of about 12v if you try this. 12v DC wall warts are easy to find laying around.

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Old 06-09-2009, 08:55 PM   #13
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okay I'll we what I have around. Do I need resistors if I go with a 12V supply?

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Old 06-09-2009, 09:56 PM   #14
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if you have an old cordless phone charger laying around the wall warts are 9 volt . I used one for my stirplate

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Old 06-09-2009, 10:04 PM   #15
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you can either get a potentiometer or use resistors and experiment with their values. for now you probably don't need to mess with the voltage regulator module.

just remember V=IR (voltage = current * resistance) where voltage is in volts, current is in amps, and resistance is in ohms. install the resistance either on the positive or negative side of the fan, it doesn't make a difference for this kind of application. when you're calculating, remember to add the resistance of the fan into your equation...

if all else fails, just experiment. you won't fry your fan if you use a 12v supply.

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Old 06-09-2009, 10:09 PM   #16
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thanks all! I know we have a bunch of gourds lying around so I willsee what I can work with.

I do have a rheostat so the 12v supply should be good

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Old 06-09-2009, 10:40 PM   #17
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Just found a 12v old netgear router a my in laws and snagged the cord, hopefully this works

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Old 03-02-2011, 02:57 AM   #18
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Chode, long thread i know but did your netgear router power cord work? I'm using a similar linksys router cord.
Does ampage matter?
I've rigged up a stir plate with a 12v case fan and a 12v power cord but the magnet in hte beaker still just jumps around.

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Old 03-02-2011, 04:07 AM   #19
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Chode, long thread i know but did your netgear router power cord work? I'm using a similar linksys router cord.
Does ampage matter?
I've rigged up a stir plate with a 12v case fan and a 12v power cord but the magnet in hte beaker still just jumps around.
I used a linksys cord and it works well. Originally, it threw the bar because it was too fast but I stacked another hard drive magnet onto the original one and it no longer throws the bar. Double your magnets and adjust it as close as you can to the top of the case.
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Old 03-02-2011, 04:19 AM   #20
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Thanks Butler, seemed to improve!

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