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I didn't get around to trying it out but the 555 timer calculator that the author sites below seems to be a good way to figure it out. A 1muF capacitor theoretically has a frequency of 3.5 secs and a 0.2muF has 0.7 seconds, both of which you can find at radioshack. I'd say try both and see which works better
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Nice ible! I used a single 100Ohm potentiometer instead of the two 50Ohm. Also, I used a magnet from a Macbook Pro laptop and I'm not sure if its smaller than the one you used but it had a really hard time with the larger stir bars so I ended up using the smallest stir bars (like 1/2 inch) and was able to get a 2000mL flask to get a small whirlpool going. Enough for a yeast starter! Thanks again
Nice ible! I had to replace my wife's hard drive on her Macbook Pro so I used the magnet for a stir plate on another instructable! I removed the magnet from the brace by bending the metal brace with plyers (the metal brace is a lot weaker structurally than the magnet). Once most of the brace was bent there was only a small surface area that was still glued which was easy to pull off by hand. Sorry I forgot to take a picture of it! Here's a couple pictures of the stir plate from the other instructable.Cheers!
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