I have found a pretty simple PWM circuit based on a 555 timer here http://www.instructables.com/id/Simple-and-dirty-Pulse-Width-Modulation-PWM-Wi/
It looks great! How ever, I am having trouble with two things.
1. What values would C1 and C2 have to be to get a frequency of 1khz?
2. I am looking for a duty cycle of 0%-50%, what would be the best way to do this?
Thanks in advance fellas

 

The circuit diagram you are planning to use has an error - see this previous thread

http://forum.allaboutcircuits.com/showthread.php?t=22026

 

thats no problem, i see how it goes. thanks for pointing that out
now how do i get a 1khz frequency out of it, and the 0-50% duty cycle