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transistor (solidstate)

A transistor is a semiconductor device commonly used for amplification. The device can amplify analog or digital signals. It can also switch DC or function as an oscillator. Typically, when transistors are discussed, reference is being made to bipolar transistors. Physically, a bipolar transistor amplifies current, but it can be connected in circuits designed to amplify voltage or power. If an amplifier employs bipolar transistors, it will be referred to as a 'solidstate' amplifier, in contrast to an 'analog' amplifier, which will not contain transistors.