I'd like to see more recipes from people who are happy with the way their recipes turned out! My favourite comes from the website of Club Wort in Palatine. The recipe is about 2/3 down the page. http://www.clubwort.net/resources.htm
Here's the recipe:
Phil's Krupnick Recipe
***3...
I built a stir plate using a LM 317t voltage regulator and a 5k potentiometer. After soldering it all together and finally getting it near working the potentiometer smoked up and burned out right before my eyes. It burned out while I was adjusting the speed, trying not to throw a stir bar.
I...
Brawny, are you sure the leads are correct on the potentiometer? I made a stir plate of the same design and I soldered the wire from the switch to the far right on the potentiometer. That is, from the Earth on the switch to the far right on the potentiometer as it's positioned in your diagram...