国外非常出名的 arduino-uno 的开发板的印刷图和电路原理图，现在非常的流行，国内的也慢慢有人在做了-Very well known abroad arduino-uno of the development board printed diagram and circuit diagram, now very popular, some people in the country are slowly doing

介绍了印刷电路板的布局原则，即如何在印刷电路板上合理的布局电子元件。-Introduced a printed circuit board layout principles, namely, how to printed circuit board and a reasonable layout of electronic components.

电脑主板pcb文件,个人电脑的pcb印刷电路板的图-Computer motherboard pcb File Download

PLC在凹版印刷机上面的运用 以及三电机的同步控制-PLC in the use of the gravure printing machine above as well as three synchronous motor control