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How do transistors amplify an input signal?

Karen Wright

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Carlton Burgess on August 22, 2018

There are three legs of a transistor. One is connected to the input signal. One for the power supply, and the third to the earth. (These have different names, depending on whether the particular device in your hand is a bipolar transistor or a field effect transistor.) The pin connected to the input signal controls the amount of voltage that allows the passage of the power supply pin to the ground pin. So, basically, to amplify an input signal that is fed more power in the "power supply" pin on the transistor that is power on the "input" pin. You do not want a large amount of the difference between the input and output of a transistor because it will distort, if it is asked to much, so that a very high-power transistor amplifier of several stages. That's a big difference between the design of a transistor amp and a tube amp: a tube that is going to give a lot more amplification in a stage before it distorts. First example: the Marshall 2203 amplifier head, which is the most popular heavy metal guitar amp head around. It's a 100-watt amplifier that contains a stage of pre-amplification with two tubes and a power amplification stage with four tubes. If that was a transistor amp that was going to have at least 50 of the transistors in the same. Another example, and a better one at that, is the 4CX35000 radio tube...which will amplify a 1750 watt input of 35,000 watts in one of the stages. I love the solid-state devices for their low power consumption, the reliability and the low temperature, but if you are looking for a lot of profit in very few devices, tubes have always been the way to go.

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