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JFET as unijunction transistor?

Discussion in 'Electronic Components' started by Salmon Egg, Oct 11, 2006.

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  1. Salmon Egg

    Salmon Egg Guest

    It strikes me that a JFET, junction field effect transistor, has the same
    basic structure as a unijunction transistor. Has anyone here tried using a
    JFET as a unijunction transistor? How has it worked out? What is a good
    cheap type to get for the purpose?

    Bill

    -- Fermez le Bush
     
  2. ian field

    ian field Guest

    With only 2 transistors (1 NPN & 1 PNP) you can simulate a programmable
    unijunction transistor (PUT) - simply connect the base of each transistor to
    the collector of the other, the emitters are the anode and cathode.
    Technically since you have access to both C/B joins the device you have
    created is a silicon controlled switch (SCS) you can regard this as a
    thyristor with an anode gate as well as a cathode gate - and if you ignore
    the cathode gate its a PUT.
     
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