BeerBorg

I made a sweet stir plate from an old computer that I had in the garage. The fan fits just perfectly inside an old Roku streaming device that I had. I made the slightly more complicated but electronically sound design that uses a voltage regulator,potentiometer,two capacitors and one resistor. I included an on-off switch and it has an input for the wall wart. The only thing I might change is the number of magnets on the fan. I harvested two from the hard drive. I might include a diode to protect against using the wrong polarity power source. It's wired with a positive tip and negative sleeve. I don't want to accidentally fry something by using the wrong wall wart.

It works very smoothly and the pot adjusts the fan speed gradually. I bought a 1 inch stir bar. It gets thrown if I'm not careful about how I get it spinning. There is a speed where it locks in and is very solidly in the magnetic field.

My daughter and I had fun watching the vortex and putting multi-colored fluids into it. It's like a science fair over here!
I used it to make some cold brewed coffee.
Its a fun project.

Nice work. You should be fine with using a 2 liter flask with that stir plate.

Nice job! Can you post the schematic and component values?

http://www.stirstarters.com/instructions.html

http://farm4.static.flickr.com/3139/274 ... 9a0d77.jpg

Parts source: https://www.smallbearelec.com/home.html


I used the values from the first link.

The second link has a very helpful picture of the components and how they are connected. By using the picture you don't have to read the schematic. Just follow the picture.

The first link uses only one capacitor. From the reading that I have done one or two capacitors can be used. Some designs eliminate the capacitors totally. Their use depends on how far the power source is from the 317 voltage regulator. I used both capacitors because it can't hurt to use them.

Nice job!