how can i invert the square wave through 74hc14????..plz gve me the schematic..i have tried alot with the RC network but its nt working..may be i m doing sum mistake..help..

 

Use a 2nd one. Am I missing something here? A 74HC14 is an inverter, so if you don't like the output of the firrst one use a second one in series and all will be happiness.

 

You seem to have this in two threads, which is not allowed: moderators may want to merge them.

It's not clear though why an "RC network" is needed anyhow if the input is a square wave which just needs inverting. Pleas post a schematic.

 

The other thread was deleted. Please post a schematic that depicts your problem, and include your clock source if possible.