The picture above shows a 2km FM transmitter circuit. This circuit is divided into three stages: oscillation, frequency doubling, and power amplification. V1, C2--C6, R2, R3 and L1 in the circuit form a capacitive three-point oscillator. Its oscillation frequency is mainly determined by the parameters of C3, C4 and L1, and its oscillation frequency is 44 ~ 54MHz. The signal is from the center tap of L1 The output is then coupled to V2 through C7 to amplify. The double frequency signal of 44 ~ 54MHz is selected by C8 and L2, that is, 88-108MHz. This signal is coupled from C9 to V3 for power amplification. V3 consists of three 3DGl2 transistors connected in parallel , Can expand the output power. When the circuit works normally, the current is about 80-100mA. The three 3DG12s that make up V3 can be added with appropriate heat sinks to prevent overheating. During the production, L1 ~ L3 are wound with a single layer of 0.31mm enameled wire on a round rod with a diameter of 3.5mm.
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