By designing TDA7490 sine wave inverter power supply, we educed a method to design an inverter power supply with low distortion by using class-D on-off audio part.

通过对TDA7490的正弦逆变电源运用设计，尝试出一种利用D类开关音频器件设计低失真逆变电源的方法。

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Then the choosing method of the probe of electric field and the designing of the amplify and A/D circuit is put forward. The interface of communication is also put forward in this paper.

然后分别从水下电场探头的选择，电场测量放大电路与A/D转换电路的设计，通讯接口设计等方面阐述了该仪器的研制思路。

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It is based on the mathematic model, and it has been established the 3-d grooves designing method and developing process for finish cutting stainless steel.

根据三维断屑槽切屑折断数学模型，建立了适合精车不锈钢的三维复杂槽型设计方法及开发流程。

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