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前面放一级OPA2134是用作LPF的，也减小输入电容，OPA3684用了交流反馈（AC Couple），最终输出失调直流是10mv和12mv，还算马虎吧，静态16ma，用9V 200ma电池能撑个8~10个小时。声音很不错，比OPA2134的47耳放更明快一些。
这个电路加得好, 可否再详细讲讲其原理以及信号和音质方面的影响呢
