Hey hey! I have a project in ORCAD in which I have to design a PWM with the following parameters: f=15000 Hz, amp. of PWM between 3 and 6 V and duty cycle between 40 and 70%. I am not very good with electronics, so I found a guy on youtube with a video with adjusting the duty cycle of a 555 timer without changing the frequency.I designed the circuit, entered the values he calculated to see how this works, run the simulation and I have nothing at output... I could use some advice about this.
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