I do some beer homebrewing and I thought you might be interested in my homemade stir plate. I use it to propagate yeast to pitch into the beer. It's a little fun with hardware hacking.
Parts list...
2 Potentiometers (one for coarse control, and one for fine control)
1 Power switch
1 Power charger from an old cell phone (12V)
1 muffin fan from an old PC
1 Rare earth magnet (from an old hard drive in that same PC)
4 Bolts
1 radio shack project box
1 stirplate magnet
I was lazy and just taped the magnet to the top of the muffin fan with electrical tape.



Parts list...
2 Potentiometers (one for coarse control, and one for fine control)
1 Power switch
1 Power charger from an old cell phone (12V)
1 muffin fan from an old PC
1 Rare earth magnet (from an old hard drive in that same PC)
4 Bolts
1 radio shack project box
1 stirplate magnet
I was lazy and just taped the magnet to the top of the muffin fan with electrical tape.




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