Transistor is one of the most important electronic components that one needs to develop an understanding of, be it a professional electronics engineer or a budding hobbyist.
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Transistors come in a variety of physical shapes and sizes depending on their application. However, there is also a swathe of differences based on the type of junctions used in a transistor. Namely BJT, UJT, FET and IGBT to name a few.
Here is an interesting video that discusses what’s the best way of incorporating a transistor into a project.