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FM transmitter - explanation required

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Horcrux

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FM transmitter

NEED HELP!!

This FM transmitter works. I get it from a post while surfing the net. The original circuit is actually the thing inside the yellow box.

Minor changes were made. I made its input to be either from an electret microphone or from RCA jack (input from computer, MP3, etc..). I also regulated the input voltage (red box).

But can you explain and elaborate any information about it (the things inside the yellow box)?? There are just things that I don’t know.

The oscillator used?

The purpose of some capacitors and resistors?

The LC combination?

And any thing you can add..

Thanks a Lot..
 

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