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Source for programmable unijunction transistors?

Discussion in 'Electronic Design' started by [email protected], May 12, 2008.

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  1. Guest

    Where would I buy a few dozen PUT's? If Mouser or Digi-Key stocks
    them, I am too dumb to be able to find the part number. Thanks in

    Alice Parker alice atsign nancy1234 dot com
  2. Tim Shoppa

    Tim Shoppa Guest

    2N6027/6028 is the current generation of parts and available from
    Mouser, Digikey, etc.

    2N4870/4871 and 2N2646/2647's are previous generations (but still
    available from Newark, etc.)

  3. 2N4870/1 are not PUTs, they're UJTs. There was an even older one that
    was popular, but I can't remember the part number.. 2N6246? Ah,
    2N2646. UJTs have a chunk of intrinsic Silicon between the two bases,
    wheras the PUTs are essentially an upside-down SCR. The application
    circuits are almost the same except the PUT needs two resistors to set
    the trigger point (and the parallel resistance of the two resistors
    sets the valley current).

    Best regards,
    Spehro Pefhany
  4. Leon

    Leon Guest

    Many years ago I needed a UJT when they had just been invented and I
    couldn't buy one, so I simulated one with an NPN and PNP transistor.
    It might be possible to do the same for a PUT.

  5. Guest

    <blink> <blink>
    People still use those? Hey cool. Check out the Wiki

    Part numbers to give you a start.
    Wow, I haven't heard about these in decades. I had fun with UJTs
    though, used them to build a strobe light. The UJT was in a relaxation
    oscillator to trigger the xenon tube.
  6. legg

    legg Guest

    Pro-electron part numbers




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