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Which wire is the negative wire?
black
Positive – The wire for the positive current is red. Negative – The wire for the negative current is black. Ground – The ground wire (if present) will be white or grey.
Which wire is positive or negative?
Usually* the wire with the white stripe or the dashed lines carries the “positive” (+) end, while the other, unmarked wire carries the “negative” (-) end.
Are PC fans AC or DC?
Cooling fans are a vital part of computer hardware, as they cool the CPU and ventilate casing. DC fans are supplied with DC power from regulated DC supply or motherboard header pins. These fans are also called 3-pin fans, as they come with 3 pins: a supply pin (usually 12 V DC), a ground pin, and a signal pin.
What’s the color of the third wire on a fan?
A PC fan’s wire colors are pretty consistent, with red almost invariably marking the positive and black marking the negative or ground. The third wire varies depending on the manufacturer, but usually, it is blue or yellow. You don’t need it to make the fan turn, but the third wire is there for a good reason.
How does a 4 wire fan work on a computer?
A 4-pin fan uses its first three wires the same way a 3-pin fan does. The fourth wire connects to a circuit on the main board that’s used to control the fan with precision. Instead of simple “speed up” or “slow down” controls, the fan can be set to specific fan speeds as the CPU gets hotter.
Where do I find the pinout on my PC fan?
PC fan pinouts can be found easily online: If you’re trying to figure out which wire is ground on the fan itself, and you don’t have a connector, then just connect 12V to the middle wire and try ground on either of the outside wires. When the fan spins, you’ve found it. The other, if connected, is a tachometer.
When do you need to know the 3 wire fan pinout?
There are only a couple of circumstances when you might need to know the 3-pin fan pinout. One is if your computer has a proprietary, nonstandard fan connector. In that case, you might want to buy an adapter to make your fan work with that specific computer’s board.