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How can a monostable multivibrator using IC 555 be used as a PWM generator?

How can a monostable multivibrator using IC 555 be used as a PWM generator? Correct Answer If the control pin is always kept high

A monostable multivibrator can be used as a PWM generator if a modulating signal is applied to the control pin. The control pin is used to vary the voltage at the inverting node of the upper comparator. If unused, then the control pin is grounded through a capacitor.

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