DC Fans Speed Control

DC fan speed can be controlled in order to optimize cooling, reduce noise and decrease system power draw. There are various methods of controlling fan speed.
(Please place the mouse cursor over each item to show a diagram)

 2-speed Control  Temperature Detecting Variable  PWM Control
 

Correct Signal Connection:
Correct signal connection is important to prevent damage to the internal fan IC. Connection should be designed as shown below:
 
 In case of signal output
Signal Output
 In case of RPM control signal
RPM Control Signal