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按照数据手册上用洞洞板焊接的VCA821自动增益电路，在测试的时候，当控制电压从0V变化到1.7V，可是VCA821从0.4V左右才开始正增益，却不能衰减，而且增益倍数大概是1倍~10倍，这是为什么呢？求大神可否指点一二。。万分感谢。。
洞洞板不适合高频，建议改PCB。
