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FM发射机以其良好的传输音质、并不复杂的装调过程以及无需专用的接收设备等特点得到众多爱好者的青睐。然而,大部分业余FM发射电路仍采用较原始的LC振荡方式,以致在实验过程中不可避免地出现严重的频率飘移、交流噪声干扰现象,即使采用诸如屏蔽隔离、多重稳压、印刷电感等一系列解决措施,也难以获得理想的无线传输效果。我们分析了目前专业广播FM发射机中所采用的稳频、降噪技术,设计了二款造价低廉,
FM transmitter with its good transmission of sound quality, not complicated assembly process and no need for special receiving equipment and other characteristics of many enthusiasts of all ages. However, most of the amateur FM transmit circuits still adopt the original LC oscillation mode, so that during the experiment, severe frequency drift and AC noise interference inevitably occur even in applications such as shielding isolation, multi-voltage regulator, and printed inductor Series of solutions, it is difficult to obtain the ideal wireless transmission. We analyzed the frequency stabilization and noise reduction techniques used in the current professional FM transmitter and designed two low cost,