The monolithic integrated FM transmitter circuit composed of MC2831A and peripheral components is shown in the figure. The operating voltage of MC2831A is 3~9V. The frequency of the crystal SJT is selected between 22~30MHz. L1 is made of 0.1mm high-strength enameled wire, wound 30 turns on the high-frequency skeleton, and the inductance is about 10uH. L2 is made of 0.12mm high-strength enameled wire with the same skeleton, with 10 turns in the primary, tapped at 3 turns, and 4 turns in the secondary. L3 is wound into an air-core coil with an inner diameter of 6mm and 8 turns using 0.55mm high-strength enameled wire. Antenna FX uses a 1~2m pull-rod antenna. The transmission distance of this circuit can reach more than 200m. Its disadvantage is that the output power is small when the RF amplifier stage is not added, which is not conducive to long-distance transmission.
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