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用4046设计频率调制信号电路如下：
不接入调制信号时，VCO输出频率不稳定，无法调整载波频率在一个固定的值上（例如38K），请教一下怎么分析？
刚才截图忘了补充了，补充
你这个元件在那里找的？我新装的没有查到这个软件..
