I think I've made this thing too strong. I made a double stirplate, because there are occasions when I'll have more than one starter going. My intention was to get a decent vortex going in a 1 gallon jug with around 2000ml in it. When I turn the thing on (and keep in mind that the base isn't built and the fans aren't mounted yet) the actual stir bars I bought aren't even strong enough to keep up, so I've pretty much figured I'll have to use another rare-earth rod magnet as a stir bar. This is a little noisy though, you can kinda hear the metal on the glass and I'm sure it's fatiguing the base as well with all the bouncing it's doing. Any ideas on how I can get that stir-bar to work, or keep up with the fan?
Here's the lowdown on the stir plate:http://www.homebrewtalk.com/f51/my-stir ... ild-86252/
<---the instructions I used
2x 25 ohm 3 watt Rheostat (aka Potentiometer): Part number 271-265 - $3.99
2x 12 Volt DC/30Amp Rocker Switch with LED - Part Number 275-018 - $3.99
2x 80mm 12VDC Computer muffin fans
So I've tried 3 different power supplies, a 3V (too weak), a 12V (Way too fast!) and a 6V (getting there, still throws magnets). I'm also not sure a) how much of a vortex I need, and b) if there are any dangers from too much vortex, or if things are just going to get good and oxygenated.
Any people out there with experience in this sort of thing?