On 5/25/16 10:31 PM, SWISSNIXIE - Jonathan F. wrote:
I would like to build a clock/counter/timer with the ZM1200 pandicon
tube, which contains 14 digits 0-9 that can only driven by multiplexing.
Datasheet:
http://www.tube-tester.com/sites/nixie/dat_arch/ZM1200_philips.pdf
What i wonder:
* Does the Bias Voltage or Screen Voltage draw any current, or can it
be limited to nearly zero?
It's an AC thing, so it uses no current, but add a bypass capacitor.
* I would create the different Voltages with Z-Diodes, like in the
Schematic, page 6 :
http://www.tube-tester.com/sites/nixie/dat_arch/ZM1200_valvo.pdf
* For pulse duration i would go with about 300us, should not be a
problem for modern microcontrollers, and the HV513 IC
That might be slow enough. You want to be sure that each cathode
ionizes. Probably not a problem in a single-tube display like this.
* I don't know much about multiplexing at all, is the idea to switch
on one digit for 300us, and then the next, or make a small gap where
nothing is driven (all low)?
To prevent ghosting, turn off the active anode, then wait a while (~50
us), then change the cathode selection, then wait another ~50 us, then
turn on the next anode.
--
David Forbes, Tucson AZ
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