help me about AM transmitter circuit

[usama]

Hi, (I am not good in English language).
I am student from libya,I constructed the circuit
AM transmitter from this site,but it not work, this circuit seem simple composed it from two transistors.
I need to your recommendation and notice until work this circuit.
Please I am very very needed your help .(in fast)

Use i mic from old radio?,(I mean good mic or no) (mic has 2 connection)
In (libya) my country not found variable capacitor ,can I use variable capacitor from old radio 500pf ?

Notice: when I tested this circuit I change variable capacitor by ceramic capacitor and putted the circuit nearly from music source, then searched
By the radio but no received. (The radio seems frequency receiving).
Help me if you can
I sent diagram and text for this circuit
Thank you,, plz faster,,byeeeeeeeeeeeeeeeeeeeeeeeee

[audioguru]

Hi Usama,
Welcome to our forum.
Since your radio seems to be receiving something (probably unmodulated carrier, which sounds quiet), then the circuit is transmitting but is not modulated.
The circuit specifies a 3-wire electret microphone but you used a 2-wire mic from an old radio. Old radios don't have a mic, so I don't know what you are using. If your mic is a 2-wire electret, connect 1 wire to circuit-ground, and the other wire to R1 and C4 which are joined together. If it still doesn't work, then try swapping the mic's wires.
P1 is the transmitter's modulation "volume" control. It will be loudest when adjusted to the "shorted" position.
Good luck.