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Old 11-25-2012, 11:07 AM   #191
Apr 2012
Posts: 34
Liked 1 Times on 1 Posts

Originally Posted by JeffersonJ
This may seem like a dumb question... has anyone ever tried using a casing that is itself a ferrous (magnetic) material? My mind can't quite parse out whether it would interfere with the attraction between the stir bar and magnets.

The reason I ask is that I have a fried guitar pedal that would make a perfect casing. I'd rather figure out the casing before sourcing the other materials. To be specific, I have one of these:
Mine is made out of a medal box as well and I ended up just cutting out a hole where the magnets spin at because I couldn't find magnets strong enough to go threw the medal and turn the stir bar. You can always try using it and if it doesn't work use a whole saw and cut a circle hole in the top.

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Old 12-05-2012, 03:34 AM   #192
Oct 2012
Tampa, Florida
Posts: 38
Liked 6 Times on 4 Posts

Got around to building my stir plate. A standard LM317 build with an on/off switch.

There's an 80mm computer fan which as a piece of 1" schedule 40 PVC hotglued to it with some rare earth magnets on it. I've dremeled out some holes (melted out, really) for the magnets using a cutting wheel and then secured the first magnet with hot glue. The rest stay by themselves. The speed is controlled by an LM317 with a 330 ohm resistor going from OUT to ADJ and a 10k ohm audio taper potentiometer with on/off switch. I can control power on/off and get anywhere from around 3V to 11.5V out to the fan. The power connector is a standard kobiconn 2.1mm barrel jack from Mouser, but the rest of the parts are from Radio Shack. The box is a 6x4x2 project box from Radio Shack as well.

One problem I ran into was putting too many magnets on the fan. With 4 magnets the 1" stir bar would not spin at all. I think the friction of the bar pulled so hard against the device would just prevent the fan from spinning at all. 3 works great, doesn't throw the bar at even the highest speed, and is silent at low speed with a dimple being pulled into the starter.

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Old 12-05-2012, 03:49 AM   #193
Mar 2011
Minneapolis, Minnesota
Posts: 86
Liked 4 Times on 4 Posts

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Not a whole lot to it but it sure looks nice.

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Old 12-05-2012, 02:06 PM   #194
Hang Glider
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Mar 2007
North Augusta, SC
Posts: 3,220
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yes..., yes it does !

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Old 12-07-2012, 10:44 PM   #195
Sep 2011
Posts: 59
Liked 2 Times on 2 Posts

Just finished mine yesterday...

Bare bones - 93mm fan, couple of rare earth magnets, rheostat, 5v cell phone charger.

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Old 12-08-2012, 05:24 AM   #196
Mar 2012
Portland, OR
Posts: 370
Liked 107 Times on 66 Posts

The enjoyment of homebrewing!!

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"A new beer begins today"

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Old 12-16-2012, 05:45 AM   #197
Jan 2012
Posts: 218
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I just finished mine, I'm excited to give it ago with my next brew.
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Old 12-21-2012, 06:08 PM   #198
mpride1911's Avatar
Sep 2012
Deferiet, NY
Posts: 438
Liked 135 Times on 93 Posts

$1.99 box from Goodwill.
Master switch left over from some idea I had for my boat.
$0.99 12V power supply from Goodwill
Pot bought off Amazon = too much after shipping and handling, but at the time it was the only way I could buy one.
$8 (?) for a 10 pack of rare-earth magnets from Amazon and a fan from a computer I don't use anymore.
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Old 01-01-2013, 04:02 AM   #199
Feb 2011
Lievala, Kuusumu
Posts: 109
Liked 20 Times on 14 Posts

I used this circuit for the control:

Although I replaced the power stage with a single FET to make it more efficient and simpler.

5000mL Erlenmeyer.

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Old 01-01-2013, 06:24 AM   #200
ISUBrew79's Avatar
Mar 2008
Posts: 214
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Pretty standard design.
College Creek Brewing Company, est. 2008
Primary: Belma/Cascade Pale Ale, Cranberry Melomel
Secondary: None
Bottled: Imperial Pumpkin Ale, Founder's Breakfast Stout Clone

On Tap:
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Keg 2: Belgian Tripel

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