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CD4046输出频率波动太大

Other Parts Discussed in Thread: CD4046B

Hi TI 工程师:

CD4046B输入674Hz, 输出最大波动到770Hz,15台机器出现了6台 巨大波动的情况。原理图按照的推荐电路来做的,原理图如下,能帮忙查看下是否有错误?