can somebody help me. i need to construct a fixed frequency variable duty cycle with a phase shift using 555 timer. someone please help me. urgent. thanks.

 

What frequency, how variable is the duty cycle, how much phase shift, compared to what, which direction, using what voltage and how much current will be needed at the output?

 

Need more detail.
What kind of phase shift do you require?
What about this: http://www.dprg.org/tutorials/2005-11a/

It has fixed frequency with adjustable duty cycle as you requested.