... 电平调整衰减器 level-adjusting attenuator 电平工作输入 level-operated input 电平记录器 level recorder ...
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内外招使用按键按下与否带来的电平的改变来控制对应的单片机输入或输出口工作。
The inside and outside move of use pressed key presses down the level change which or not brings to control corresponding the monolithic integrated circuit input or the outlet work.
另一方面，为了兼容其他那些工作输入信号电压不为0的器件，如模数-数模转换器，信号电平也许要做平移。
On the other hand, the signal may require level shifting in order to be compatible with the input of other devices (such as ADCs) that are not designed to operate at 0v input.
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