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VCA821失调电压很大,如何调节?

Other Parts Discussed in Thread: VCA821

VCA821失调电压很大,就是当只接上电源,输出端接示波器,结果有很大的失调电压,大概有1V多,但是此电路能实现压控放大,就是偏置很严重,电路如图。

烦请了解的大神帮忙提提意见,谢谢!