Question:

What Transistor was used befor BJTs(Bipolar Junction Transistor) ?

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What Transistor was used befor BJTs(Bipolar Junction Transistor) ?

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  1. BJTs were among the first good transistors ever used. Here's a brief history of what came before 1947-48 when the BJTs were first invented.

    http://en.wikipedia.org/wiki/Transistor#...


  2. The first transistors were point contact type.

    Then came the grown junction transistor, a lot more rugged and practical than the point contact type.

    Then came alloy junction or diffused junction transistors (Philco and Sprague)

    Finally the modern planar junction transistor.

    .

  3. AS we the transistor works as a switch.

    the transistor was firstly invented in the late fiftys and the transistor to be firstly made is the bjt.

    Vacuum tubes were used before using the bjt.....  

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