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Originally Posted by MetalMan
Why not just use a 12V regulator from Radio Shack? Using diodes could drop the fan's voltage lower than 12V as the battery's voltage drops during a discharge.
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Yeah, but if it's only a couple volts higher than 12v I like to use diodes because it's easier. The regulator definitely works, it's just doesn't wire up as nicely as inline diodes - you can solder up 2 or 3 in a row and put heatshrink over it. And yeah, the battery drop will also cause the fan speed to go down, but I'd rather undervolt a fan than overvolt.