William Shockley improved on this design with his junction transistor, a three-layer sandwich of different types of semiconductor. The diagram illustrates the basic design of an NPN junction ...

N-FETs are like NPN transistors – the gate pin needs to ... that you’ve seen in our first example schematic – use another FET or BJT to pull the gate into one direction, and a resistor ...

The first transistor was about half an inch high. That's mammoth by today's standards, when 7 million transistors can fit on a single computer chip. It was nevertheless an amazing piece of technology.

This transistor switching circuit uses an npn transistor, a voltage divider ... the transistor is on at \(20^\circ C\). This is an example of a temperature sensitive switching circuit.