在4046的14、4引脚加一个频率计试试看,就可以看到频率的倍数了。
追问添加之后结果如图,4046的4脚输出就是1000HZ呀,不懂为什么呀?
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/a1ec08fa513d26971593d9c457fbb2fb4216d8e3?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
追答MR不应该接地吧,把它接到Q3上试试
追问MR是复位端,接Q3还是原来结果呀
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/342ac65c10385343aa14bdba9113b07ecb808855?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
追答R2决定最低频率,R1决定最高频率,因此R2应该大于R1。
追问还是不对呀,频率输出还是1KHZ。还有4046的2脚和13脚不应该是一样的吗,为什么接这两个脚输出会不一样那?
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/5bafa40f4bfbfbed5197f4e37af0f736aec31f64?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
追答2脚是相位比较器1的输出脚,13脚是相位比较器2的输出脚。锁相环的知识,我也不是很懂。环路滤波也是就是低通滤波在锁相环中的作用很关键。