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Old 06-21-2011, 08:09 PM   #731
camiller
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Are you sure you don't have a short somewhere that is causing it to pull a lot of amps? The fan by itself should not be pulling that much of a load that it would cause the rheostat to smoke, plus now that it has smoked it may be damaged.

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Old 06-21-2011, 08:22 PM   #732
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perhaps. here's how i've hooked it up... is this right?

i have the positive from the fan and the power supply going to the right hand terminal on the rheostat. i have the negative from the fan and power supply going to the middle terminal on the rheostat.

sound right?


EDIT: okay... it's working!!! main problem i think was that the magnets had the same poles facing up. i reversed one of them and all is working well now. got a great vortex (or whatever you want to call it) and can even crank it up full speed without throwing the stir bar!!

that said, i'm still having issues with the rheostat. i put a new one in, redid the wiring (put new connectors on the wires) and i still had smoke in the rheostat. i think, though, it's only happening when the rheostat is in the full-off position. what is causing that? see above for wiring and let me know if i've wired the thing wrong. it seems as though when i crank the rheostat up a bit, the smoking stops and all is well. would love to know this thing isn't going to burn down my house once it's used for real!!

thanks gents for all the help. much appreciated!!!!

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Old 06-21-2011, 11:00 PM   #733
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so here's a few pics... one with the wiring so y'all can see if i've got something wired up wrong.

2011-06-21-15_55_48.jpg   2011-06-21-15_55_58.jpg   2011-06-21-15_56_19.jpg  
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On Tap - Devastated Sky, CDA
On Tap - Fallow Fields, Autumn Ale
On Tap - East Creek Sour Wheat, Sour Wheat Ale
Fermenting - Nothing :(
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Old 06-21-2011, 11:10 PM   #734
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Quote:
Originally Posted by Apoxbrew
so here's a few pics... one with the wiring so y'all can see if i've got something wired up wrong.
That's a nice box!! I like that you cut the top for less resistance (I'm assuming), but it gives the opportunity for stuff to get in should your starter explode.
I've got mine wired a bit different. The hot from the fan is on the right terminal, the hot from the plug is on the center, and the two negative are connected.
Beautiful box! Were the cigars good?
image-1144819406.jpg  
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Old 06-21-2011, 11:37 PM   #735
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Quote:
Originally Posted by Apoxbrew View Post
so here's a few pics... one with the wiring so y'all can see if i've got something wired up wrong.
Yeah, there is a problem there. Basically the rheostat is not doing anything, if you pulled the connectors off the rheostat, you still have a circuit right? If you really want speed control wire it like Chefencore describes.

Edit: If you look at the pics in the very first post you will notice that only two wires connect tothe rheostat, not four as in your pic.
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Old 06-22-2011, 12:09 AM   #736
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thanks chef and cam!!!

okay... got the wiring fixed. the rheostat now doesn't turn the fan all the way off... but it does adjust the speed a bit (though not as much as i expected).

regardless... it's not smoking anymore so that's awesome, and it's working great!!

so what's the ideal speed. do you want the vortex to come all the way down and hit the stirbar or not so much?

should i cover the hole with some thin plastic or something to protect against liquid in the event of an explosive starter?

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Old 06-22-2011, 03:00 AM   #737
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I usually shoot for an inch or half an inch, really just need to keep it stirring.

I would cover the hole with a thin piece of clear plastic.

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Old 06-22-2011, 03:11 AM   #738
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Like I said, mine won't pull a vortex down with 1L in a 2L flask. But it works. It's a stirplate, not a tornado-maker.

To preserve the beauty of your stirplate, maybe you could find the thinnest piece of plexiglas to put over the top. Or if you are handy enough, place an insert just in the place you cut out.

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Old 06-22-2011, 03:29 PM   #739
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hmm... is there a way to slow down the fan even more then? i've already dropped to the DC 9v, 100mA power supply and still, with both a 1L and 2L starter on the slowest speed, i'm pulling the votext all the way down to the stirbar. not consistantly, but it'll move up and down and occasionally touch the stirbar.

i'd rather not have to find another power supply. can i place a resistor inline on the hot side of the PS or something to drop the current (or voltage or whatever) more and slow the fan down a bit?

i know very little about electronic wiring so if there's a way to do this, would love your input.

otherwise though, i'm quite happy with things! going to find a nice piece of clear plastic to put over the hole. thanks for the tip!

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On Tap - The Tunguska Event, Cream Ale
On Tap - Devastated Sky, CDA
On Tap - Fallow Fields, Autumn Ale
On Tap - East Creek Sour Wheat, Sour Wheat Ale
Fermenting - Nothing :(
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Old 06-24-2011, 04:19 AM   #740
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Just wanted to thank the OP. This was a great $ saver project. I probably would never had a stirplate without this cheap build. I did just like the OP except I mounted mine to the top. Cost me about $20. Just finished and dialed it in. No big vortexes but it works great. Thanks

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