![]() ![]() By cascading these switches (switches that control switches that control switches, etc.) very complicated logic circuits can be designed. With the three-terminal transistor one can also make an electric switch that can be controlled by another electrical switch. ![]() This three terminal character of the transistor is what allows us to make an amplifier for electrical signals, like the one in our radio. In a three terminal device one can control electric current or voltage between two of the terminals by applying an electric current or voltage to the third terminal. The transistor is a three terminal, solid state electronic device. Vacuum Tubes as Predecessor of Transistors On December 22, 1947, John Bardeen, Walter Brattain and William Shockley at ATT‘s Bell Labs developed the first transistor, the key active component in practically all modern electronics. John Bardeen, William Shockley and Walter Brattain at Bell Labs
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