PWM
What is PWM?
Pulse-width modulation (PWM) is a technique used to control the amount of power delivered to a device by varying the width of a pulse. The average value of voltage (and current) fed to the load is controlled by turning the switch between supply and load on and off at a fast rate. The longer the switch is on compared to the off periods, the higher the total power supplied to the load. PWM is commonly used in applications such as motor speed control, dimming LEDs, and generating analog signals with digital devices.
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