Quote Originally Posted by burak450 View Post
I am just trying to keep servo isolated from pic.
You really shouldn't NEED to isolate your servo from your PIC as long as you have a well designed circuit to drive it. I've used servos with my PICs, never had a need to isolate them, ran them off the same battery pack, same wires, etc.etc.etc.
If you're trying to run a PIC and a servo off a 9v battery (the little rectangular ones) connected to a single 7805 type regulator without any sort of cap's in the circuit anywhere, well, then, yes, you will most likely have a problem.

Maybe if we saw your schematic, we could help you figure out a way to avoid the isolator altogether...
Maybe you forgot to put a pullup on MCLR...maybe your oscillator setup is a bit goofy...maybe you got peanut butter in your chocolate... Who knows...