Stupid fan wiring...

[mike31154]

Originally Posted by Myka

As long as I know which wires do what, I'll be fine. The only reason this isn't completed yet is because B&E isn't open on the weekends. I can't believe how hard it is to find a simple 12VDC power supply these days!

You don't have a Can Tire or Wal Merde in Saskatoon? $s to donuts they'll have a 12 volt wall wart. They will probably also have a cheap digital multi-meter for sale. A useful tool for figuring out polarity, i.e. which wires do what. You're not really going to hurt anything with 12 volts DC if you get the polarity wrong, especially with the 9 volt battery scenario. If you reverse the polarity, the fan will either run in reverse or not at all. LEDs as well, they are essentially diodes, so correct polarity, they'll conduct (light up), reverse polarity, they won't. You'd have to apply a very high voltage to cook them in reverse polarity.