06-15-2015, 02:56 PM
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Moderator
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Join Date: Mar 2004
Location: Saskatoon, SK.
Posts: 11,268
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Quote:
Originally Posted by mike31154
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.
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Neither Crappy Tire nor Wally's had a 12VDC power supply. So you owe me donuts!! 
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