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PUT (programmable unijunction transistor)

Discussion in 'Electronic Components' started by b.a. marcus, Dec 28, 2003.

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  1. b.a. marcus

    b.a. marcus Guest

    I've been experimenting with a relaxation oscillator using an NTE6402
    (basic PUT). I've been searching the net looking for information to
    predict the oscillation time but the datasheets I have found are meant
    for professionals. I (a hobbiest) need some information detailing the
    math involved in calculating values for C, R, R1, R2 for a given
    frequency. I can get oscillation for the time period I desire (4-10
    Hz.) on a protoboard, but I need to be able to document calculations.
    Can someone direct me to a URL for a tutorial. Or even suggest a hard
    copy publication.
  2. I suggest you use a 555, which is well documented and designed to
    overcome the limitations of UJTs etc. Did you ever wonder why you
    don't see these UJTs and PUTs used anymore? Well..

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  3. Chaos Master

    Chaos Master Guest

    b.a. marcus[] said this in sci.electronics.components, at 27 Dec
    Use a 555 timer, that is far more "advanced" and "modern" than PUT's. There's a
    LOT of info on the 555 timer on the Internet. Just type "555 timer" on Google.
    The timer will be far more useful than a PUT in new projects.
  4. Mark Zenier

    Mark Zenier Guest

    Wow, talk about non-answers.

    The first problem is that NTE is just a parts reseller for the hobby
    and service market so they probably won't have anything more than
    a skeleton datasheet. So the task is to reverse lookup that part.

    That wasn't too hard, as there aren't very many types of PUT.
    So I found some Motorola PUT numbers, 2N6027 and 2N6028.
    Both cross to NTE6402.

    Ok, so whatever part of Motorola who makes PUTs, (if they still
    make them), probably has the application notes, online, that they
    included in their 1988 Thyristor Databook.

    Try On Semiconductor, first, they are the spinoff that make?/sell most
    of the non-RF discrete parts that used to labeled Motorola. Most likely
    as a big PDF file. Get it, you'll also learn a whole lot about SCRs
    and Triacs, too.

    Mark Zenier Washington State resident
  5. b.a. marcus

    b.a. marcus Guest

    Well that doesn't answer my question. But thanks for trying.
    I have used the 555 in this circuit and it makes the design bigger and
    consumes more power. UJT or PUT is the way to go in this anolog
    design. I have extended battery life by at least %100 by using the
    PUT. I can slim the PCB by 1/2" or more. Also, with a PUT you don't
    have to use an electrolytic capacitor. I am using a .05mf ceramic in
    this "non-precision" application. A x555 is overkill in this circuit.
    Thats my opinion.
  6. Marcus,

    Where did you find the datasheet?

  7. b.a. marcus

    b.a. marcus Guest

    I found several data sheets on PUT and a few good example of how to
    use it.

    I guess my math skills aren't what they used to be. The information is
    there but I can't hash it out.

    Anyway, I'm considering going to TTL for this device. It'll be my
    first TTL project. But I will publish the current schematics soon.
  8. b.a. marcus

    b.a. marcus Guest

    Yeah, don't you love all of the free advice you get sometimes.

    On is where I found the Data/application sheet. It is pretty good actually.
    I just need to sit down with pen and paper and work it out.

    Thanks for the suggestions.

    B.A. Marcus
  9. Tim Auton

    Tim Auton Guest

    You shouldn't top post.

    And a happy new year,

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