hey guys this is someone here from dia biking well in today's project EU we are going to build our stuff on magnetic asteroid by using commonly available hardware such as a bunch of MDF shields a 12-volt PC fan a bunch of old laptop batteries and the best part about this magnetic Hester is that it has variable speed control so that we can resolve anything in variable density solutions so have a look at how you can put one for yourself I started by cutting the pieces for the enclosure using my homemade table saw all the pieces are made out by using 7 mm thick MDF sheet check the description below for the dimensions of each of these pieces I have glued rubber o-rings to each corner of the baseplate this will lead to help us to avoid the whole unit from skidding during operation to drive the rotating head I've used a brushless PC fan to make the whole unit power efficient as compared to using a brushed motor this one is rated at 12 volt and draws up to 1.7 amps of current since we don't want the pan to blow any air so i've tear down all the fins from the motor bail now to power this magnetic stirrer I'm going to use three lithium polymer cells that have got from an old laptop battery each one of them is rated at 2000 mAh and has a potential of nearly 3.7 volts which gives us an output of 12 volt when connected in series I've glued a 3mm thick MDF disc to the rotating head which gives me more eager to securely glue the magnets over it later here I'm using some powerful neodymium magnets the link to them will be given in the description so be sure to check it out later I've made some slots to mount a switch and a charge inject at the rear side of the enclosure now to control the speed of the rotating head I've decided to build myself a pulse with modulation a speed controller for that I've designed the PCBs for the required circuit by using the somatic and later I have ordered my PCBs from jlc PCB comm for the first order I have got 10 PCBs for $2 which includes the shipment cost right at my doorstep all I needed to order my PCBs is to upload the Gerber files and check out the options that are given below that whole process took some time but at the end it was all worth it as the quality of the PCB was just too good for the prices they are offering so don't forget to check out their website that is jlc PCB comm the list of the components and the Gerber files for this printed circuit board along with the somatic for the circuit will be given at the instructables vloggers port for this project the link to that will be given in the description below for more details about this pulse width modulation circuit and it's working have a look at the previous project video the link to that will be given at the top-right corner of this video so don't forget to check it out the output of the speed controller is then connected to the pc fan or rotating head where as the input goes directly to the battery pack the stirrer is made by gluing a pair of magnets and with between two plexiglass shoes but that being done our magnetic stirrer is ready to stir our drinks if you liked this video then don't forget to give it a big thumbs up moreover have a look at some of my other project videos as well and for more upcoming projects do subscribe to our YouTube channel by clicking on the link just given over here thank you very much for watching this video and I'll see you soon in the next one