本设计实际上是将被测模拟量转换为数字量，并进行实时数字显示，主要由以下几部分构成：量程转换电路、AC-DC转换电路、3位半A/D转换单元电路、基准电源单元电路、译码驱动单元以及数码管显示单元。其中A/D转换器选用三位半MC14433，基准电源选用MC1403，译码驱动器则MC14511，另加四个共阴极LED发光数码管。

-In fact this design is to convert the measured analog digital and real-time digital display, mainly by the following components: range conversion circuit, AC-DC converter circuit, three semi-A/D conversion circuit unit, the baseline power unit circuit, drive unit, as well as decoding digital tube display unit. One A/D converter selection of the three semi-MC14433, baseline power selection MC1403, decoding drive the MC14511, a total of plus four LED digital tube LED cathode.