![]() Although there are cases where single layer boards are preferable, there is an ever growing demand for smaller, more functional electronic devices. There was a time when all boards were single layer, with components mounted on one or both sides, known as single-sided or double-sided, respectively. First, let’s take a look at the advantages of single including single and double sided component mounting, and multiple layers then discuss how to design the best multilayer PCB. Today, the optimal number of layers primarily depends upon the application. By using surface mount devices (SMDs) and vias, multilayer boards can be made smaller than single layer boards and deployed into more compact products and locations. To this day, the ability to safely move people between the multiple levels of vertical structures remains essential for civilization’s continued development.įor electronic or printed circuit boards (PCBs), the ability to route electrical signals vertically has been an essential factor in the growth and deployment of electronics for an ever-increasing number of applications. Finally, the problem was solved by Elisha Graves Otis, in 1852. Although the need for a safe and reliable way to vertically traverse multiple levels of structures existed for millennia, no one had devised a device to accomplish this until the mid-1800s. This device has enabled rapid movement across structures with over 150 floors or levels. One of the most profound inventions that is not heralded as such is the safety brake for elevators.
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