This long range fm transmitter electronic project is designed using common electronic parts and is capable to transmit signal up to 400 meters .
This FM transmitter can be used to supervise a room or to design a wireless microphone . To listen the signal it can be used any Fm radio receiver.
Construction of this fm transmitter circuit is very simple requiring few components and is very easy to build.
L1 is 0.1uH, 6 to 8 turns of 22-gauge hookup wire close wound around a 1/4-inch diameter non-conductive core . C4 is an trimmer with 4-40pF.
To calibrate this fm transmitter circuit device we must set the radio receiver in the down side of FM scale and rotate C4 until we hear the signal from transmitter device.
The capacitors that are used in this fm transmitter circuit are ceramic type capacitors .
This transmitter circuit can be powered from a 9 volt battery or a simple 9 volt DC power supply .

Circuit Diagram: