I do NOT want the answer, I just want to be pointed in the right direction. Its a 500-HZ digital signal and duty cycle is 20%. What is the formula, or how do I get to the answer because I can't find it in my book? Thanks for the help again.

 

D = Ton/( Ton + Toff)

 

Hello,

The cycle time of a signal is 1/frequency.
The duty cycle is the percentage high signal VS low signal.
http://en.wikipedia.org/wiki/Duty_cycle

Bertus

 

I do NOT want the answer, I just want to be pointed in the right direction. Its a 500-HZ digital signal and duty cycle is 20%. What is the formula, or how do I get to the answer because I can't find it in my book? Thanks for the help again.

This NE555 PWM calculator should be of help

 

Thanks guys, I'm not fully understanding yet, and I'm not sure why. I'm gonna give it one last look in my books, and move on. Thanks again.

 

The answer is quite simple.
For F = 500Hz and D = 20% we have
T = 1/F = 1/500 = 2ms
D = Ton/T * 100%
Ton = (D * T)/100% = (20 * 2ms)/100 = 400us

 

I got it now, thanks guys. It all came together in the end. Thanks again for the help.