求翻译：直流硬件调速系统主要利用了MOS管的高电平导通低电平截止的特性作为开关来控制速度，同时555构成的多谐振荡器能产生高低电平的方波来为MOS管提供了调速的介质，并通过调节电位器控制高低电平的产生时间，最终达到直流调速的目的。在整体的设计过程中我们主要体现了直流硬件调速的简单、便捷等优势。利用硬件调速的方法和过程不仅仅只是这些，在参考各种资料和指导老师的分析发现通过改变一种硬件的管脚串并联就能产生一种新的振荡电路和直流控制方式。设计成果主要包括一个交流变直流的整流电路和一个调速控制电路。是什么意思？

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DC hardware speed system MOS main advantage of the high level of continuity through the low-level features as an on off switch to control the speed, while a 555 monostable multivibrator of high and low level can have a square wave to MOS tube provides the speed of the media, and through the adjustme

The direct-current hardware velocity modulation system mainly used the MOS tube high level breakover low level closure characteristic to control the speed as the switch, simultaneously 555 constitution multivibrators could have the height level square-wave to come are the MOS tube have provided the

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