Hi,
Thanks for your care, I've just finished my graduating project, and the IR repeater circuit is just a part of it.
This website (electro-tech-online) helped me alot realy, and I am thankful for that.
I've included in the project documentation that I did not bulit the circuit and included the link for it in the references.
And according to the fact that they, the Doctors, might ask me anything even if i did not design it , make me ask about everything that comes through my mind.
Thank you again, and wish me luck because my presentation is on Tusday.