As mentioned in a previous post, a beer brewing friend asked me to build a magnetic stirrer for his yeast cultivation setup. This is the finished device. The guts are made from a 80mm 12V computer fan with chopped off blades, a couple strip boards, some neodymium magnets, and PVC plumbing pieces. I used an adjustable linear voltage regulator (LM317) to control the speed.
Fan Motor Speed Control Circuit Diagram
Magnetic Stirrer Exterior
Magnetic Stirrer Interior
Fan Motor Speed Control Circuit
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