The voltage measured from GND to the switched off cathodes.
At dircet drive, the Ukk is equal to Ua (Ua = Va = Up = Vp = Anode voltage
= Supply voltage = Plate voltage)
Not necessarily - if you're direct driving them with 74141 chips, Ucc
would be about 60 volts, and with K155ID1 chips, about 100 volts. Aside
from those, yes, the off cathodes would be allowed by most drivers to
"float", and they'd tend to float to the anode voltage (which isn't always
the supply voltage, but the maintaining voltage if another cathode is lit
and there is an anode resistor). I realize that's pretty pedantic of me,
but it's easy to get confused about what your circuit is actually doing
unless you're aware of these various effects.
Oh yes John, thanks for that comment.
You are right of course.
I must clarify again:
(note that this is my own "language" ;-) - For the ones who don't like it -
please tell me how you would name it, or ignore it)
a) When I speak of "direct drive" I always mean 1 high voltage transistor
for each cathode, without any Zener diodes.
b) When I speak of "clamped direct drive" I mean 1 low voltage transistor
for each cathode, with Zener diodes for clamping. (74141 ect.)
c) When I speak of "multiplex drive" I mean 1 high voltage transistor for
each cathode group, without any Zener diodes, multiplexed
d) When I speak of "clamped multiplex drive" I mean 1 low voltage transistor
for each cathode group, with Zener diodes for clamping, multiplexed (74141
multiplexed for example - the worst drive ever)
Note that this is all not valid for biquinary Nixie tubes of course, but for
standard nixie tubes
Dieter
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