take about 90VDC to light up, but after they light up
they'll stay on
until the voltage drops below 60VDC or so. Only problems are:
1. The thresholds can vary greatly from unit to unit.
2. The thresholds will vary depending on ambient light, as well.
Use pulse coupleing so each runs at it's range. Also I do have a basic
design for a TTT machine using neons and 2d21 thyratrons.
I feel personally that would be good for demonstrating some for the other
forms of logic used.
Then again someone would want that interfaced to PCI too.
Allison