16 Jul
2007
16 Jul
'07
11:29 a.m.
On 16 Jul 2007 at 10:31, Brent Hilpert wrote:
Sometimes it's fun just to go through the design
exercise. An initial thought
was that, either:
- you'd need a "non-core" latch to hold the state of the core counter
logic
before driving the Nixies because you don't get a static state level out of
the cores, at which point you have as much complexity of non-core logic as you
would without using the cores;
I suppose if we wanted to stay with the general spirit of things, one
could use a cold-cathode thyratron. I've seen where ordinary NE-2s
are triggerd by placing the bulb in a conductive sleeve, shielding it
from external light and simply pulsing the shield to
trigger the
lamp. Heaven forfend that I should use an SCR or transistor! I
wonder if the clock could be derived from line frequency without much
more than a few diodes.
I'd still like to read that document you pointed
to about the SS90 containing the
core logic principles but I think it's about 20-30 MB and have yet to download
it.
When you get a chance, do. It's very interesting--and very different
from the usual semiconductor logic that we're used
to.
Cheers,
Chuck