电平转换电路和比例放大电路的性能符合设计指标，文中给出了测试曲线和数据。
The testing result of voltage transfer circuit and proportional amplifying circuit is in consistence with the simulation result.
对于硬件接口电路中常用的一些方法进行了简要的比较，并介绍了电平转换芯片MAX232及其应用方法。
It gives comparison among some methods which are often adopted in the interfacing circuit, and introduces a chip MAX232 of level translation and its application method in detail.
对于这些应用，设计人员集中于电路能够连转换最小可用电压电平到有用功率。
For these applications, designers focus on circuits able to convert even the smallest available voltage levels to useful power.
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