I'm having an issue with my DIY stir plate. I followed the instructions on Brewiki, however the potentiometer only works if I turn it waaaaaaay down. Otherwise, at least 90% of the range of the pot only has the fan on full blast.
What did I do wrong? Is the 1K pot the wrong sized pot? Should resistance be higher/lower? Do my components need to be rated for higher wattage? (Some items, like the 100-ohm resistor, are only rated for 0.25W.) The potentiometer is rated at 2W. I fried my first one, which was only rated for 0.5W, so I beefed this one up a bit. Now the pot won't fry, but it hardly works.
Why isn't my circuit working?
EDIT: Starting to think my pot has too much resistance...