The 9018 transistor is used to transmit FM radio. It has few components and is simple and suitable for beginners. Beginners may draw ugly pictures on the drawing board. Everyone is welcome to point out improvements. In addition, L:7T in the circuit is a hollow inductor. It is recommended to use thick copper wire to wind seven times on a thin screwdriver. The coil frequency is about 82MHz-87MHz. This coil is very important. Slight changes may affect the transmission frequency.
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