In PWM (pulse width modulation speed control) speed controlled fans, a fixed frequency square wave between 30 Hz and 30 kHz is applied to the PWM signal input. The ratio of the On-time vs. the square wave period is proportional to the RPM.
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In PWM (pulse width modulation speed control) speed controlled fans, a fixed frequency square wave between 30 Hz and 30 kHz is applied to the PWM signal input. The ratio of the On-time vs. the square wave period is proportional to the RPM.
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