Computer case fan in humidor help

[DBall]

Originally Posted by audio1der

If you can find a variable voltage regulator, you can adjust the speed of the fan by varying the input voltage. Then, you can add a digital timer before the voltage regulator and have it come on for a few minutes at preset times!

I need to figure out how to do this... I have three fans in my tower that I can't turn on because they are just too damned powerful.