what is a pwm cable

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Soumen 2023-01-25T14:59:18+05:30 1 Answer 3 views Beginner
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  1. Soumen
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    2024-04-28T16:17:16+05:30
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    A PWM cable, short for Pulse Width Modulation cable, is a type of electrical cable that carries a signal used to control the speed of a device, most commonly computer fans. The cable itself doesn’t actually supply power, but rather sends a signal to the device telling it how fast to spin.

    PWM works by rapidly switching the power on and off. The length of time the power is on compared to the time it is off is called the duty cycle. By varying the duty cycle, the average amount of power delivered to the device can be controlled. In the case of a fan, a higher duty cycle means the fan will spin faster, and a lower duty cycle means it will spin slower.

    PWM cables are typically four wires:

    • Ground (black)
    • 12V power (yellow)
    • Speed control (blue)
    • Tachometer (optional, white) – This wire is used to monitor the fan speed.

    Most modern motherboards have PWM headers that can be used to control the speed of fans connected to them. This allows the computer to adjust the fan speed based on the temperature of the CPU or other components.

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