434 分立元件的功放，前级差分电路中恒流电路的作用与原理
Synopsis
分立元件的功放主要有ＯＴＬ电路和ＯＣＬ电路，它们的前级放大是使用了差分放大电路。差分放大的Ｅ极需要连接一个恒流电路， ...
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