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Old 01-23-2013, 08:11 PM   #211
LoloMT7
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Jan 2012
Missoula, Montana
Posts: 1,913
Liked 1268 Times on 679 Posts


Hook the negative from the wall adapter straight to the negative on the fan. Then hook the + from the wall adapter to the potentiometer then the other pin form the potentiometer to the fan. The "ground" pin if there is one should not be used on the potentiometer.

 
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Old 01-23-2013, 08:14 PM   #212
LoloMT7
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Jan 2012
Missoula, Montana
Posts: 1,913
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http://www.brewmorebeer.com/building...e-for-brewing/

 
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Old 03-04-2013, 07:32 PM   #213
iainwb
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Mar 2013
Tuscaloosa, AL
Posts: 10
Liked 1 Times on 1 Posts


So I finally built my stir plate. It was about $30 in the end, so I saved about $20 over the cheapest that I have seen online. The power brick, magnets and the fan were free. I bought a PWM speed controller on eBay for about $8 to control speed, after reading up on the pros and cons of rheostats and voltage controllers. I was not interested in doing any soldering. I can get everything from a gentle stir to a large vortex in my 2L flask.
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Old 03-14-2013, 02:39 AM   #214
KZE80
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Jun 2012
Denton, TX
Posts: 52
Liked 32 Times on 18 Posts


Just finished. Only missing the magnet.

Bought a 4 pack of 12v fans from Newegg for $11.00 and I've got a small fruit crate lying around that would be perfect for a double stirplate. Think I'll throw that together pretty soon.

If someone had told me 1 year ago that I'd be this excited about yeast I would have slapped them and then thrown up from laughing so hard.

...yet here I am...contemplating the purchase of Petri dishes and vials. Who knew?!?
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Old 03-14-2013, 05:38 PM   #215
stamandster
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Jun 2011
springfield, ma
Posts: 783
Liked 53 Times on 44 Posts


Quote:
Originally Posted by TrickyMike View Post
Kind of plain jane, but it works pretty well. I have a 2L Flask on order.

I used a 110V fan and a plug-in dimmer. I have a really good electronics store locally and the staff are guys that generally know their stuff. One of the guys I've had help me before recommended that I use a 110V fan and a dimmer so I didn't have to worry about losing torque at the lower speeds. Of course, it's high voltage, so you have to be a bit more careful. Seems to work pretty well. Spins a 2-inch bar really well. I have 2 neodymium magnets hot glued to the fan with opposite poles facing up. I have to admit, though, I expected a lot more torque with the 110V fan.

I just pulled the guts out and mounted them in the case.
What'd you use for the box??

 
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Old 03-15-2013, 01:23 AM   #216
cooldood
 
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Jan 2013
Belgrade, Maine
Posts: 614
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My basic but works model


 
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Old 03-15-2013, 02:22 AM   #217
bsomogyi
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Sep 2011
Erie, CO
Posts: 100
Liked 20 Times on 9 Posts


Here is my stir plate. Couldn't pass up these little metal boxes from the hobby lobby. They are the perfect size for a stir plate.
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Old 03-16-2013, 04:13 PM   #218
alien
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Apr 2012
Philadelphia, PA
Posts: 1,235
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Parts list:

1 Dell PC fan (junk)
1 LM2596 adjustable step down DC-DC converter (ebay, $1.54 shipped)
1 10K ohm linear taper potentiometer + knob (Tayda, $0.50 + $0.22)
5pcs Neodymium disc magnets, 3mm x 21mm (ebay, $1.35 shipped)
1 large penny washer (Ace hardware, $0.37)
1 barrel-type DC power jack 2.1mm (Tayda, $0.16)
1 12V power supply (junk)
1 food container
3-pin angle header, 0.1" pitch (Tayda, from 40 pin strip $0.17) (optional)
3 female-female jumpers (ebay, from 40-way strip, $2.80 shipped) (optional)
Epoxy resin
Hot glue
Solder
Hook-up wire

The step down DC converter came with a 10K multiturn trimmer that was too fiddly to use, so desoldered it and put a 3-pin header in its place. I connected a 10K potentiometer to the header using jumpers, but I could have just soldered wires in place. All that remained was to solder the barrel jack to the inputs and the fan to the outputs, and hot glue the fan in place. I used epoxy glue to stick a penny washer on the top of the fan and stick the Neodymium disc magnets to the washer. Total cost, less than $5 but I had a few bits and pieces lying around.

If I can be bothered, I'll put in a little microcontroller like a Attiny2313 to monitor the tachometer output from the fan and show the RPM on a 4 digit LED display.

Edit: RPM meter up and running but needs a few tweaks.

 
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Old 03-17-2013, 10:59 PM   #219
TMadness1013
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Jul 2012
Rochester, NY
Posts: 43
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Back when they were the hip new thing, I bought an external DVD burner and it came housed in this unit. This made my build super easy as I was able to use the existing power supply and just had to hook all the cables up. The only downfall is that with the DVD drive, the outside of the box lit up with really cool blue lights. I haven't been able to make those work, but it looks pretty slick otherwise and was a super easy project.
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Old 03-19-2013, 07:52 PM   #220
KZE80
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Jun 2012
Denton, TX
Posts: 52
Liked 32 Times on 18 Posts


My fruit crate double stir plate. Just mocked up for now.
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