Posted by mycologic design (07/06/10 06:08 PM)
I am very close to completing a DIY mag stirrer--the fan works, I have a magnet from a hard drive, a 2000 mL flask and stir bar
but the stir bars doesn't spin.  I need some advice.

My fan is a large 12 V fan, my ac adapter is also 12 V, I have connected the wires to a rheostat and can adjust the speed.  I have more than one magnet (I've tried a few at a time) but the stir bar doesn't move.  My container is a plastic tuberware.  Any thoughts?
Posted by cuddlebear (04/25/09 08:57 AM)
There's a good how to at http://www.instructables.com/id/Magnetic-Stirrer
Posted by denger (11/10/08 12:04 PM)
For a delux version of the stirrer you can add a simple voltage regulator circuit to adjust the fan speed:

http://www.seattlerobotics.org/encoder/200112/variable.html