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用2N4401制作1.5V微型无线调频话筒 | 骆驼调频
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用2N4401制作1.5V微型无线调频话筒
2010年11月19日 FM ⁄ 共 219字 暂无评论 ⁄ 被围观 233 views+

  本文用了12个元件做了一个微型无线调频话筒,工作频率稳定,发射距离在30米左右,6V供电时可达到100米以上。
电路如图所示,BG1与C1、C3组成高频振荡电路。其发射距离与发射管工作电流大小有关,上偏电阻R2可改变BG1输出电流。
选择BG1时,管子的fT必须大于300MHz,但fT太高会影响调制,电感L分作两个线圈来绕制,但绕向必须相同,L1用直径0.5mm漆包线在直径5mm骨架上绕4匝,L2绕3匝。天线可用一根0.6米长的软导线。

200612184027671

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