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

[duckling]

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....

 

[Khabree]

Re: FM transmitter

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"

 

[Awarapunshee]

Re: FM transmitter

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

https://www.electronics-lab.com/projects/rf/001/index.html

Regards