BJT's were the most commonly used transistors in analog and digital hardware. FET's also had their uses but didn't' compete with BJT's performance in the fastest digital logic circuits or analog applications like audio. Is that still true today? What has changed and why?

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There are three main types of elevators commonly used: traction with a machine room, machine-room-less traction, and hydraulic; however, there are variations on each type.

Difference Between Series and Parallel Circuits. The major difference is that the series circuits have the same amount of current flow through all the components placed in it. ... On the other hand, in parallel circuits, the components are placed in parallel with each other. This circuit splits the current flow.