![]() Today’s CAD systems are far different and much easier to use. The other problem was that schematic capture and PCB layout were usually completed using separate tools, which meant that schematic components and layout footprints were not associated with each other. Those first tools didn’t offer much assistance to designers and you had to be really good at manipulating primitive graphics like lines, arcs, and circles to create what you wanted. Later on, as designers migrated to CAD tools, the components were built using those same CAD tools. Originally, PCB designers created library components by laying down a sticker or “dolly” on a sheet of mylar on a drafting board. Circuit board design has changed a lot over the years, and the way we work with library components has shifted as well.
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