9018 is a high-frequency low-power triode, silicon material NPN type, characteristic frequency fT up to 1.1GHz, suitable for use as an FM emission transistor.
The following picture shows the 9018 single-tube FM transmission circuit diagram. The circuit structure is simple, suitable for electronic enthusiasts to carry out experimental production and ordinary temporary applications. As can be seen from the circuit diagram, this is a typical three-point capacitor oscillator. In addition, 9018 is not a dedicated emitter transistor. A certain degree of frequency drift may occur in the circuit operation. The larger the operating current, the more severe the frequency drift.
The inductor coil is wound by 6-8 turns on a φ32mm drill with a φ1mm enameled wire, which can cover the FM broadcast band of 88-108MHz, which is convenient for FM radio reception. Adjusting the tightness of the coil adjusts the transmit frequency. The transmitting circuit can reach a distance of about 100 meters (draw rod antenna) in the open area.
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