本文对光纤液位计的组成和原理作了介绍，光纤液位计由模数转换装置、光导纤维对及逻辑数字显示电路组成。
This paper presents the composition and the principle of optical fibre liquidometer. It is composed of analog—to—digital converter, a pair of optical fibres and digital display circuit.
介绍了利用VHDL硬件描述语言结合FPGA可编程器件进行数字钟的设计，并通过数码管驱动电路动态显示计时结果。
The paper introduces the design of digital clock based on FPGA and VHDL, the time of clock can be displayed with the digital driving circuit.
采用湿敏元件HS1100/HS1101以及A/D转换器CC7107等常用元器件，设计了一款电路结构简单而且成本低廉的数字显示湿度测量仪。
Using the HS1100/HS1101 capacitive humidity cell and the A/D converter CC7107 etc, this article designed a low cost and digital-displayed humidity measurer.
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