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"Bob Monsen" <rcsurname@xxxxxxxxxxx> wrote in message
news:pan.2005.12.16.06.00.43.225205@xxxxxxxxxxxxxx
> On Wed, 14 Dec 2005 22:33:38 -0800, james9326@xxxxxxxxx wrote:
>
> > Hi anyone try 16 Stage Bi-Directional LED Sequencer? i had try, but
> > didn't work. Do not know what is the cause?
>
> 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
> inputs).
>
> 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.
You forgot to mention that he should verify the orientation of the LEDs as
well...
--DF
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