Free download first transistor
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The underlying principle of such a device would be something called the field effect-the ability of electric fields to modulate the electrical conductivity of semiconductor materials. The goal was a three-terminal device made out of semiconductors that would accept a low-current signal into an input terminal and use it to control the flow of a larger current flowing between two other terminals, thereby amplifying the original signal. If a more rugged, reliable, and efficient alternative to the triode could be found, the rewards would be immense.
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But vacuum tubes were power-hungry and fragile. Not only had the triode made long-distance telephony and movie sound possible, it was driving the entire enterprise of commercial radio, an industry worth more than a billion dollars in 1929. The vacuum-tube triode wasn’t quite 20 years old when physicists began trying to create its successor, and the stakes were huge.
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