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LM2907-N: 搭建F/V输出电路,输出电压0V,无电压变化,求助

Part Number: LM2907-N


我用LM2907MX-8/NOPB搭建了一个F/V电路,vcc=24V,输入为经过放大的标准方波信号,频率0-200Hz/5v,输出PIN4电压0V,无变化,

C1电容换过1UF/100NF/1NF 容量  输入PIN 1改经过串联接1UF/100NF电容,PIN4输出无电压。PIN2,电压17V

VCC换12V,PIN2电压  7.8V,PIN4无输出电压变化

这个估计是什么问题?

谢谢