Bipolar Junction Transistors (BJTs): These were the earliest transistors (including the original 1947 point-contact device and later junction transistors). BJTs are made of three alternating ...
In the early days, PNP bipolar transistors were common, but the bulk of circuits you see today use NPN transistors. As [Aaron Danner] points out, many people think PNP transistors are “backward” but ...
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