will it make any diffrence if i use the 2n4401 transistor instead of the 2n3904 that was specified in the circuit that i am trying to build?
where i bought the transistors i was told that the 2n4401 will work, but i am not sure . i have built the circuit three times and it does not work

or could it be the inductor , i used a 22 gauge wire not the magnetic type . do i have to remove the insulator from the wire or just leave it. I am getting fustrated need help

thanks!!

 

Are you building on a breadboard or on a printed circuit board?
A breadboard will be unreliable for high frequency circuits.
Use a copper board and very short connections with a good layout of components.

 

yes it is on pcb,

 

Download the data sheets for the two transistors.
Compare them.

Using a different wire size will change the frequency expected for a given number of turns.

You say it does not work. That is too vague to give more advice.
Do you mean the circuit is off frequency? Does not oscillate?

Can you attach a clear circuit diagram for us to see what you have built?

 

update

the circuit does work, however the transmitting distance is very poor and very unstable
i will have to place my radio very close to the circuit one foot.
it transmits at 94.5 fm .when i connect the 9v battery, i will have to move the battery around the circuit for it to transmit without distortion
how can i improve it

this is the link

http://www.reconnsworld.com/transmit/fm_trasm.gif

thanks

 

check this transmitter,it may help u

 

here is the schematic