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varying hertz. Yes, the frequency in a PWM circuit stays the same. To clarify, when I said varying hertz I'm refering to time and I call it frequency as a frequency of time. A period of 1 second is equal to a frequency of 1 hertz and varying hertz being the varying time the pulse of voltage is on and off. When I said the signal is not a changing value of DC voltage I meant it's not a constant voltage of different values (a voltage that's not pulsed on/off).
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