PWM Signal Generator

[kalemaxon89]

I want a PWM square wave and I tried these two methods/circuits in the picture attached.

I don't know which of the two is right, but what I don't understand is V(rms) calculated by the voltage probe.
The square wave has a Vpeak = 9V and a Duty Cycle of 35% .. so if I'm not mistaken Vrms = 0.35*9 = 3.15V.

Did I make a mistake when creating the PWM circuit?

If one of them is correct (which one?) ... how do I display Vrms?

Thanks!

[tipa]

     Привет! Пробник долго считает, подождите, и он должен выйти на правильный результат...

Вот подтверждение

[kalemaxon89]

Spoiler

In the photo you attached, V(rms) is 5.32V (as in my photo attached in the first post) ... but 5.32V is not the Vrms of 9V.
As I wrote: the square wave has a Vpeak = 9V and a Duty Cycle of 35% .. so if I'm not mistaken Vrms = 0.35*9 = 3.15V.
Am I wrong?

In simulation V(rms)=3.15V does not appear (I simulated for 30 seconds)

I noticed, however, that the correct V(rms) value appears in the "yellow box" of the voltage probe during the simulation with the entry V(dc).

[tipa · Accepted solution]

-вы просто путаете понятия постоянную составляющую и действующее напряжение.

Сами посчитаете, или помочь?

[kalemaxon89]

I noticed now that I miscalculated the RMS value. Thank you for your reply!

@tipa

[tipa]

Всегда рад помочь! ,-обращайтесь...