Feeling motivated after reading about DIY stir plates on a few brew forums, I decided to give it a go. This is a list of parts that I used: Rheostat - 3 watt, 25-Ohm RadioShack part #271-265, $3.99 Flip Switch - most will work RadioShack part #275-711, $2.99 Control Knob - most will work RadioShack part #274-407, $1.99 Project Enclosure - 8x6x3” RadioShack part #270-1809, $6.