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Problems with my USB 1.3's

Discussion in 'SimTools compatible interfaces' started by yobuddy, Aug 21, 2007.

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  1. yobuddy

    yobuddy Well-Known Member Staff Member Moderator SimAxe Beta Tester SimTools Developer Gold Contributor

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    I replaced the 47K SMDs with 1K SMDs at transistor #2.
    Fired up RnR13Test and I get nothing from transistor #2, the LED on the valve is much dimmer than before?

    I returned transistor #2 to a 47k resistor and the LED is back to being bright again but of course the valve does not operate.
    yobuddy, Aug 23, 2007
    #21
  2. yobuddy

    yobuddy Well-Known Member Staff Member Moderator SimAxe Beta Tester SimTools Developer Gold Contributor

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    YEA! IT WORKS!

    The solution was to lower the 5.1k plugging resistor to a 3.9k plugging resistor.

    Would it be a better solution for me to try to raise the value of the surface mount resistor and put the plugging resistor back to 5.1k?
    Should I replace all of the 5.1k resistors with 3.9k resistors?

    Man I’m happy!
    Thanks allot guys!
    Here are a couple of pic's of my Valve Control Unit all put together.

    [​IMG]

    [​IMG]

    yobuddy
    yobuddy, Aug 23, 2007
    #22
  3. egoexpress

    egoexpress Active Member

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    Nice artwork ;)

    Perhaps this plastic case recuces the valve switching noise a bit, if enclosed to the sides, as well.

    Congrats! Keep at it!

    ego

    EDIT: Btw, arent the BD649 available in your local shops?
    egoexpress, Aug 23, 2007
    #23
  4. yobuddy

    yobuddy Well-Known Member Staff Member Moderator SimAxe Beta Tester SimTools Developer Gold Contributor

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    @sirnoname
    I completely removed the 5.1k resistor leading to the transistor with a simple cable link and replaced the 47k surface mount resistor with a 1k resistor. The results are quite excellent and provide a nice snap to the relay in the valve.

    @egoexpress
    I was unable to locate the BD649 transistors here locally; even my online sources do not stock them. Most of the parts found around these parts are manufactured by NTE it seems.
    Well, looks like I may complete these boards without any transistor burns on the fingers. :D
    yobuddy, Aug 24, 2007
    #24
  5. egoexpress

    egoexpress Active Member

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    I'd like to now, when you are going to start your project thread in the DIY section. How far is your frame?
    Looking forward to it ;)
    egoexpress, Aug 24, 2007
    #25
  6. yobuddy

    yobuddy Well-Known Member Staff Member Moderator SimAxe Beta Tester SimTools Developer Gold Contributor

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    Currently the prototype is only about 30% done, since I’m building it at a friend’s workshop, I’m at the mercy of his schedule. That’s mainly why I built this unit so I could start working out the bugs. Once the frame gets a little farther I’ll start my thread for sure.

    Is there any special way I should go about getting the unit up to pressure once the cylinders are attached? It seems, if I don’t pressurize the whole system before I try to use it, the first time a valve opens it is going to move fast – lol.

    Thanks for all your help ego!

    yobuddy
    yobuddy, Aug 24, 2007
    #26
  7. egoexpress

    egoexpress Active Member

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    Never mind. It is not neccessary. Just plug'n'play ;)
    egoexpress, Aug 24, 2007
    #27
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