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This kit controls the brightness of dc light bulb or the
speed of small dc motor by PWM (pulse-width-modulation). A two-transistor astable
circuit generates a square wave with fixed frequency & varying duty cycle.
The duty cycle can be changed by adjusting
the potentiometer (VR) . The duty cycle of the square wave determines load power.
A Power MOSFET is used to drive the load.
Applications : DC motor speed control or light bulb
brightness control