simple circuit about 100 mhc works at the FM radio band. voltage from 5 to 12 volts.. For "how to modulate this transmitter" watch part 2..!!
electronic parts T1 = BF 246C ,2Rx240k, C1 100pF,
C2 2,2 nF. The coil is 3 turns around a pen. The solid wire is strong enough for 50 A. The source of T1 is in the middle of the coil. I used a pin hole board for fixing .

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