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16 Stage Bi-Directional LED Sequencer

Discussion in 'Electronic Basics' started by [email protected], Dec 15, 2005.

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  1. Guest

    Hi anyone try 16 Stage Bi-Directional LED Sequencer? i had try, but
    didn't work. Do not know what is the cause?
  2. Rich Grise

    Rich Grise Guest

    Neither do we - heck, you're the one with the circuit on the bench in
    front of you.

    Could you ask your ISP if they have a real newsserver, so you could post
    a schematic to ?

    Or at least give a little better description of what exactly it is you're
    having problems with?

    Good Luck!
  3. Er... We are only simple technicians and engineers. Some consider themselves
    even a god. But none of us is omniscient so the only thing we know is that
    apparently you did something wrong.

    petrus bitbyter
  4. Bob Monsen

    Bob Monsen Guest

    If you are talking about the Bowden circuit...

    1) Make sure that you've hooked up all the Vcc and Vss pins (yes, cmos
    will work without hooking them up, since it can often be powered by the

    2) Make sure the oscillator is working. The oscillator should be in the
    visible range (ie, hook an LED up to it) at the slowest, so you should be
    able to visually verify that the oscillator is oscillating.

    3) Make sure you have all the pins specified tied to ground...

    4) Note that while HCT logic can usually be run at 6V without harm, the
    specification states that it should be kept under 5.5V. I'd suggest 5V
    just to be safe.

    5) Make sure the counter is counting (use LEDs with the slow oscillator).

    6) Make sure the decoder is decoding (you can do this by just setting
    inputs and seeing what happens on the outputs).

    7) Add some decoupling caps between the vcc and vss pins.
  5. Deefoo

    Deefoo Guest

    You forgot to mention that he should verify the orientation of the LEDs as

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