COMPUTER FAN WIRING DIAGRAM 3 WIRE
Motherboard (CPU) 3 Pin Fan Connector · AllPinouts
Chassis and CPU fans may use either 3-pin or 4-pin power connectors. 3-pin connectors are usually used for the smaller chassis fans with lower power consumption. 4-pin connectors are usually used by CPU fans with higher power consumption. Fans and on-board fan headers are backwards compatible.
Using a 3 wire fan with Arduino? - Instructables
The three wires on a typical CPU fan is Red - Vcc (+) Black - Vdd (-) Yellow - Sensor (Hall Effect Sensor) You can control the fan using PWM. PWM is basically turning on / off power , thereby increasing, or decreasing the speed of the fan.
How PC Fans Work - PCB Heaven
The 3-wire fan powers the Hall sensor and the controller from the same line that the coils are powered. Thus, if someone tries to send PWM pulses to the coils of a 3-wire fan, the same pulses will arrive at the controller. The controller will then malfunction, because it needs constant current to operate.
Which wire is negative on this PC fan? - Electrical
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.
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