PCS-Electronics

Hi

I'm in need for a help

I have a school project, i need to build a transmiter and a receiver.

My instructor will hide the transmiter with in the campus perimeter
and i need to find it fast using the receiver.

I hope someone can gave me a schematic diagram,and the circuit must be simple and the devices must be available locally, because here in our
country there are limited resources for complex components. I hope you can help me.

Thanks ........

Here are a bunch of links, maybe they will help:
Links