I ned help to Design a 50% Duty Cycle Oscillator at a
frequency of 1 KHz using LM-555 timer.

Please help me from scratch.
Thanks

 

Everything you need to know is right here
http://www.kpsec.freeuk.com/555timer.htm

 

Or you could go to the local resources on this site.

The 555 Projects

My Cookbook

AAC Book -Chapter 8: 555 TIMER CIRCUITS

What kind of power supply and load are you expecting to use and feed?

More local resources...

LEDs, 555s, Flashers, and Light Chasers

http://forum.allaboutcircuits.com/album.php?albumid=41

http://forum.allaboutcircuits.com/picture.php?albumid=41&pictureid=308

http://forum.allaboutcircuits.com/picture.php?albumid=41&pictureid=1233