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1. 最后一级需要这么大的有效值?4.5VRMS对应的峰峰值大约有13V了,最后一级的输出电压太大。试试加负载后是否还是这么热。
2. 第二级的600mV直流有些可疑,按照之前帖子所述,DC offset被校准掉了,输出端按说不应该有这么大的直流成分。