line follower project

hi guys,
I'm in the midst of my line follower circuit project. It is actually a transistor based line follower. Here's what I'm doing Build Your Own Transistor Based Mobile Line Follower Robot (LFR). I'm using a 2N3904 NPN BJT. Is it possible to replace the transistor with an IC and without altering the other elements connected? What is the equivalent IC of the 2N3904 transisor? It should be done without the use of microcontrollers. I really need your help. I need to submit it on monday. I hope you could help me. thank you very much!

Please do not double-post. You already have a thread asking this question, so you do not need to post it again.
Thank you.
Der Strom