A transistor is a basic semiconductor element that consists of three terminals and three series-connected areas with different doping that determines the transition of the transistor (PNP or NPN). Its main task is amplification, switching and conversion of electrical signals and part of all modern electrical devices.
>The single-junction transistor is a semiconductor crystal, an electronic element with two bases and one emitter. A single-junction transistor is a bipolar three-electrode element with one PN junction.