> My reasoning is that with no power to the BCD inputs that I am in
> effect encoding zero, so the zero pin should be sinking current.
Nope - this is TTL logic, which has to be pulled down to zero, otherwise it
floats to (sort of) 1. So you've got all ones input, which will blank the
digit (not drive any cathodes low). Pull the highest bit ("8" or "D", pin 4)
to ground, and the "7" digit should illuminate. Note that you'll want an anode
resistor too, or the nixie will try to suck your power supply down to its
maintaining voltage, and that contest will likely only bring grief, no matter
which one wins.
> Ground is ground right? Are all grounds considered equal?
While it's possible to have separate high voltage and low voltage grounds,
there's no particular need to do so.
> I notice
> both my power supplies have separate ground pins coming out of them
> over and above the ground pin for the power going in. Why wouldn't
> these just be wired together on the power supply's circuit board? Why
> do they supply another ground pin?
They probably are wired together, unless that power supply has a floating
ground for the high voltage output (most don't).
- John
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