Suggest me a FM transmitter circuit to transmit audio input from microphone to radio

Im doing on my FM transmitter to transmit an audio input from a microphone to a radio. But i still cant find a suitable circuit. Is there anyone can help me out with the circuit? What is the different between nowmal microphone and electret microphone? How can i know what is the exact radio frequency for the output?

Urgent..pls help....

You can find many circuit over the internet,(you did not mention the power required). Anyway here is simple circuit for 1.5W approx.

40-50 MHz
L = 7turns dia=0.25"
Cx = trimmer 10-20 pF
Cy = trimmer 10-15 pF
Antena = 37"

90-100 MHz
L = 7 Dia=0.25"
Cx = capacitor 5.6 pF
Cy = capacitor 3.3 pF
Antena = 20"

You can also check following: (it is very good circuit)

http://www.electronics-lab.com/proje...001/index.html

Regards