CAD of schematics and PCBs

Computers have evolved rapidly over the past few years, and are now used for design work that was long thought to be possible by hand only. In modern CAD systems, for instance, computers have taken over from the traditional pen, paper and ruler. These tools are now completely replaced by advanced screen operations. In the field of electronics, too, many aspects of design have been taken over by the computer. The aim of this article is to show how an electronic circuit plus associated printed circuit board can be designed rapidly and efficiently with the aid of a computer.