Just Another Magnetic Stirrer

This magnetic stirrer uses a PC fan, a Mosfet, Potentiometer a few magnets and some wires. The purpose of this device is to stir with a rotating magnet without having contact inside the bottle/erleymeyer except for the single magnet.

I used a 80mm pc fan, if it is a different size you will need to adjust the file.

To controll the speed of the fan I used a mosfet and a potentiometer (and a few resistor iirc) to dial the speed back. This also depends on your fan. You can find a lot of videos and theads online on how to achieve this. For example this thread:
https://linustechtips.com/topic/707017-potentiometers-for-custom-fan-controller/

Other than the circuit it is juist a case for the fan. I used it to create movement in my electroplating solution. Be sure that the magnets on top of the fan are strong enough otherwise it might be hard for the magnet inside the bottle to rotate.

The magnetic stirrer bar:
https://www.amazon.nl/hoogwaardige-permanente-magnetische-roermixer-Cilinder/dp/B07YHHJCZX/ref=asc\_df\_B07YHHJCZX/?tag=nlshogostdde-21&linkCode=df0&hvadid=454838696866&hvpos=&hvnetw=g&hvrand=4303176311748882538&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9064325&hvtargid=pla-932806108711&psc=1

But feel free to purchase whatever is cheapest in you location.

I wanted the design to have 2 parts so I could print/paint the outside blue for a better finish.

Category: Machine Tools