In analog circuits, transistors are used in amplifiers, (direct current amplifiers, audio amplifiers, radio frequency amplifiers), and linear regulated power supplies. Today's most widely used schematic symbol, like the term "transistor", originally referred to these long-obsolete devices. The term "transistor" originally referred to the point contact type, which saw very limited commercial application, being replaced by the much more practical bipolar junction types in the early 1950s. The characteristics of a transistor depend on its type. Applying current in BJTs and voltage in FETs between the input and common terminals increases the conductivity between the common and output terminals, thereby controlling current flow between them. Modern transistors are divided into two main categories: bipolar junction transistors (BJTs) and field effect transistors (FETs). Transistors are the basic devices providing control of this kind. To control the flow of a much larger current. An electrical signal can be amplified by using a device that allows a small current or voltage
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