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Old 12-19-2011, 11:29 PM   #881
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Originally Posted by mcshaw16
Belay my last. I gave the fan a few spins while plugged in and it took off and it's working fine now. Still not sure what the problem was.
The adapter may not be giving it the juice it needs to start properly. 5V is kind of low, especially since that will be the upper end of what the potentiometer will allow. But it could also be an amperage issue.

How many mA does can your adapter output? And you you have the voltage and amperage specs, and/or the make & model of the particular fan you're using?
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Old 12-20-2011, 05:08 AM   #882
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I've searched, I've read and read (this is a long thread, and the similar thread are long). My simple stir plate is in a small cigar box, 12v fan and a 12v wall wart charger. My fan (5 inch, maybe 5.5) runs slow. The rheostat seams to have no noticable effect. My stir rod just dances. I can get it to run in a circle (not really spin) if I double-stack [two on each side-reversed poles] the batteries. (I have a small bunch of dime sized/shaped rare earth magnets form an unrelated project).
my questions:
1: Do I want the fan to spin faster?

2: Although counter-intuitive, would the fan spin faster if I LOWERED the voltage? i.e. am I better off with a 6 or 9 v charger?

As always, thanks in advance...cheers.

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Old 12-20-2011, 05:57 AM   #883
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Originally Posted by LabRatBrewer
I've searched, I've read and read (this is a long thread, and the similar thread are long). My simple stir plate is in a small cigar box, 12v fan and a 12v wall wart charger. My fan (5 inch, maybe 5.5) runs slow. The rheostat seams to have no noticable effect. My stir rod just dances. I can get it to run in a circle (not really spin) if I double-stack [two on each side-reversed poles] the batteries. (I have a small bunch of dime sized/shaped rare earth magnets form an unrelated project).
my questions:
1: Do I want the fan to spin faster?

2: Although counter-intuitive, would the fan spin faster if I LOWERED the voltage? i.e. am I better off with a 6 or 9 v charger?

As always, thanks in advance...cheers.
I have built six of these types of stir plates. I found out two things: if the magnets are not directly in the center of the spin it will throw the stir bar and too much power too soon will throw it for sure. Lowering the total voltage into the unit allowed the stir bar to get hold of the spin and thus speed up gradually. I tried using a 13 v and then a six volt wall adapter and the 6V worked every time.
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Old 12-20-2011, 08:43 AM   #884
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Quote:
Originally Posted by LabRatBrewer
I've searched, I've read and read (this is a long thread, and the similar thread are long). My simple stir plate is in a small cigar box, 12v fan and a 12v wall wart charger. My fan (5 inch, maybe 5.5) runs slow. The rheostat seams to have no noticable effect. My stir rod just dances. I can get it to run in a circle (not really spin) if I double-stack [two on each side-reversed poles] the batteries. (I have a small bunch of dime sized/shaped rare earth magnets form an unrelated project).
my questions:
1: Do I want the fan to spin faster?

2: Although counter-intuitive, would the fan spin faster if I LOWERED the voltage? i.e. am I better off with a 6 or 9 v charger?

As always, thanks in advance...cheers.
I rink you want slower speeds, at least to start with. If you have a lower voltage power supply laying around, try it.

It also sounds like you may need stronger magnets or better positioning of the existing magnets.
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Old 12-20-2011, 04:00 PM   #885
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Originally Posted by emjay View Post
The adapter may not be giving it the juice it needs to start properly. 5V is kind of low, especially since that will be the upper end of what the potentiometer will allow. But it could also be an amperage issue.

How many mA does can your adapter output? And you you have the voltage and amperage specs, and/or the make & model of the particular fan you're using?
My adapter output is 800mA, I do not have the fan specs handy at this time. But for now it seems ok I guess, starts normally now when I plug it in now, and pulls a decent vortex in my flask.

The next time I have the fan unmounted I will take a look at the specs.
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Old 12-22-2011, 10:37 PM   #886
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Thanks for the information! I made my own today and all I needed to buy was the rheostat and the knob!

Today I made a stir plate! | Austin's Beer Blog

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Old 12-24-2011, 07:03 AM   #887
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Just built this today. Thanks for the detailed instructions !
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Old 12-28-2011, 07:05 PM   #888
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Working on mine now. Just ripped apart my old HD for the magnets and fan. Tomorrow I hope to procure my rheostat, switch, and cigar box as well as place an order for a 2L flask and stir bar. Can't wait to getting going

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Old 12-29-2011, 10:09 PM   #889
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Old 12-30-2011, 01:50 AM   #890
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First attempt: fail. Getting stronger magnets tomorrow.

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