A stir plate (a.k.a magnetic stirrer) is a device used by homebrewers to increase yeast cell count when making a yeast starter. It’s essentially a magnet(s) attached to a fan, which is then controlled by an IC voltage regulator. Construction is relatively inexpensive (mine cost about ¥5000 in parts), rather fun, and takes less than an afternoon to complete.
There are literally hundreds of websites and video tutorials that show how to build a stir plate, so I’ll spare you the details and offer you pictures instead.
Stir Plate Specs
Fan: 92mm 1200rpm case fan from Bic Camera
IC Voltage Regulator: 12V-24V 3A DC Motor Speed Control PWM HHO RC Controller from eBay
Power Supply: DC 12V Switch Mode Power Supply (Model: EPAS-101W-12) from Tokyu Hands
Magnet: 5mm x 6mm N38 Nickel Plated Neodymium Disc Magnet
Housings: plastic containers/boxes from Daiso ¥100 Shop


















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