Here is a transistor FM tracking transmitter. The FM tracking transmitter mentioned before in this website was built with LM 3909 IC. But if you dont get the IC then this circuit will work for you. This tracking transmitter circuit is build around 4 transistors and performance is similar to previous LM3909 tracking
transmitter circuit. The circuit can be operated with 3 to 6 volt DC. The circuit has a good transmitting range. Coil L1 is equal to 2 turns of #24 enameled wire wound on 5mm former. Use any 12 inch wire as an antenna.