So there you have it—you are correct about appearances but keep your eyes on the ideas behind the curtains, that’s where the real understanding will be found.

Indeed, and this is why I wanted it broken down into more details to get a better understanding, thanks for the help

 

Nobody has really talked about Pulse Width Modulation (PWM) here. I suggest you search for a PWM tutorial.

Hey, @Jon Chandler. I find this comment a little confusing. Did you make to the last third of the thread?

 

Whilst we are on this subject, a question about frequency, pulse width and duty cycle measurements

By knowing only two of the above, we can calculate the third?

Ie if the duty cycle is 25% and freq 60Hz, pulse width = 250ms

Should we Calculate, or Measure, these values.

Theoretically we can Calculate Pulse width as 250ms if D.C = 25% and Freq = 60Hz.
But if other phenomena occur, maybe a Physical Measurement is better?

 

By knowing only 2 of thes, we can calculate the 3rd?

Yes.

 

Whilst we are on this subject, a question about frequency, pulse width and duty cycle measurements

By knowing only two of the above, we can calculate the third?

Yes.

Ie if the duty cycle is 25% and freq 60Hz, pulse width = 250ms

No. Please show us your math on that.

If the frequency is 60 Hz, the period of one complete cycle is 0.0166667 s, nominally 17 ms. If the duty cycle is 25%, then the pulse width is 25% of the total period, 25% of 17 ms, or 4.16667 ms.

ak

 

Hey, @Jon Chandler. I find this comment a little confusing. Did you make to the last third of the thread?

Yep. The trouble is I read the first two-thirds of it which really did nothing in answering the simple question.

I think your post above mine appeared after I started typing mine, so I may not have read it.

A problem often seen here is that somebody will ask a question that doesn't even demonstrate a kindergarten level of understanding, only to receive a doctorate level lecture which does nothing to aid the fundamental concept. Sure, at some point a more detailed understanding may be necessary, but understanding the basics is the first step.

 

Yes.

No. Please show us your math on that.

If the frequency is 60 Hz, the period of one complete cycle is 0.0166667 s, nominally 17 ms. If the duty cycle is 25%, then the pulse width is 25% of the total period, 25% of 17 ms, or 4.16667 ms.

ak

Yes.



No. Please show us your math on that.

If the frequency is 60 Hz, the period of one complete cycle is 0.0166667 s, nominally 17 ms. If the duty cycle is 25%, then the pulse width is 25% of the total period, 25% of 17 ms, or 4.16667 ms.

ak

Thanks for pointing out, My maths mistake was 1 cycle second, not 60 per second,