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Home Brew Forums > Home Brewing Beer > DIY Projects > Chillers and Stir Plates > Found a computer. Stir plate help.
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Old 10-31-2014, 12:13 PM   #1
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Default Found a computer. Stir plate help.

so I found this computer next to the dumpster and took it apart for the hard drive magnets. As I got to takin it apart I found this box that is the perfect size for a stir plate that has a power switch and a male end for the power chord as well as a decent size fan. I'm thinkin...JACKPOT!! I was hoping some more tech savvy people could help me here. In the pics below I'm pointing to the wires that go from the switch to this board which has a bunch of junk that the fan is connected to. Any reason I can't solder the fan to the switch, buy a power chord and wire up a speed controller to it? Here are some pics.

image.jpg  
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Old 10-31-2014, 12:15 PM   #2
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Heres the power switch where I would wire up the fan to and remove the circuit board.

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Old 10-31-2014, 02:10 PM   #3
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That's pretty much what I did on one of my stir plate builds.

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Old 10-31-2014, 02:28 PM   #4
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That box is the power supply. You'll want to be extra careful with liquids around that thing since there is high voltage in there.

Personally, I'd close that box back up and put it in another box and use it as the power supply for your stir plate.

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Old 10-31-2014, 02:32 PM   #5
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I should have said earlier .... I used the box, minus the circuit board and used a 12 volt wall wart to power the fan. I still used the switch though.

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Old 10-31-2014, 06:29 PM   #6
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I should have said earlier .... I used the box, minus the circuit board and used a 12 volt wall wart to power the fan. I still used the switch though.
Sorry, I put removing the circuit board as a caption to the second picture. You may not have seen it. I planned to cut the board off and wire the fan to the switch. I was wondering if a computer power supply would be too much to use with the existing switch and male plug. I planned to make the usual potentiometer and knob with it as well to control the speed. Then I'd need to dig up an old power supply chord from an old computer and presto! A free stir plate.
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Old 10-31-2014, 07:32 PM   #7
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The fan will need 12 volts to run.

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Old 10-31-2014, 07:42 PM   #8
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Quote:
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Sorry, I put removing the circuit board as a caption to the second picture. You may not have seen it. I planned to cut the board off and wire the fan to the switch. I was wondering if a computer power supply would be too much to use with the existing switch and male plug. I planned to make the usual potentiometer and knob with it as well to control the speed. Then I'd need to dig up an old power supply chord from an old computer and presto! A free stir plate.
Removing the circuit board won't change the fact that there is still 120v in the box, not to mention the circuit board is what converts the 120vac to 12vdc for the fan, so now you have 2 problems.
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Old 10-31-2014, 07:47 PM   #9
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Actually 3: Ferrous metal is pretty crappy for transferring magnetic fields. You'd be better off with a plastic, wooden, or glass surface between the fan-magnet and the stir bar.

Well, let's call it 2-and-a-half.

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Old 10-31-2014, 07:55 PM   #10
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Actually 3: Ferrous metal is pretty crappy for transferring magnetic fields. You'd be better off with a plastic, wooden, or glass surface between the fan-magnet and the stir bar.

Well, let's call it 2-and-a-half.
I was afraid of that. So maybe I'll just bypass the original power supply, use the switch with a 12v chord. The box has a big hole on top where the fan is mounted with a cage like cover for the fan. So I was gonna cut some of it to accommodate the magnet.
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