Transistors - Bipolar (BJT) - SingleA single bipolar junction transistor (BJT) is a type of discrete semiconductor device that is used to amplify or switch electrical signals. BJTs consist of three layers of semiconductor material, which form two p-n junctions. The two junctions are called the emitter-base junction and the collector-base junction. BJTs are commonly used in a wide range of electronic circuits, including amplifiers, oscillators, and switches. They are available in a variety of different configurations, depending on the specific application and requirements. Single BJTs are typically used in low-power circuits, where they provide gain and switching capabilities. They are characterized by their ability to handle relatively high currents and voltages, and their low cost and low power consumption.