DIY Magnetic Stirrer Help

[Bryant1991]

Been designing a magnetic stirrer so i can sell on my Etsy store. Trying to make it as affordable as possible for reefers. Around 15-20 bucks. But I'm having issues with the electronics. I'm using a hobby 130 motor with an electronic controller. The issue I'm having is that the knob is only usable for the first 50-60 degrees,if not the bar spins uncontrollably, but the motor doesn't start turning until the knob is turned to about 120 degrees. 3v. I'd use brushless but cost is too high. I'll post more info when get home.

 

[chaostactics]

Very cool! Love this idea.