其二就是功能，目前的机箱一般都具备前置USB和前置音频插口。
The second is the function that the current chassis generally have front USB and front audio jack .
同时还详细描述了前置音频放大器，三角波产生电路、比较器，死区控制电路，输出驱动电路等子模块的设计内容。
And then describe the module of pre audio amplifier, triangle generator, comparator, death time control and output driver etc.
这种变压器耦合线路前置放大器是最终的音频注意建材工程。
This transformer coupled line pre-amplifier is the ultimate in Audio Note DIY engineering.
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