Arduino walkie talkie

Didn't this exact problem come up about two months ago.

It turns out that this is a project from some web site and the tick tick tick noise is caused by not having a correct microphone input. Read the comments at the end of the article to see a user who had exactly the same problem. He was advised to use an amplified microphone module and reported success with that.

Looking back it was only 12 days ago and here

I doubt if even when you have wired it up correctly you will get enough gain from a single transistor amplifier.