Nice. Love numitrons.
I think many thought they wouldn’t be able to handle the vibrations; however,
they were used in a lot of aircraft equipment which endure typically more
vibrations than a car.
Michail
From: neonixie-l@googlegroups.com On Behalf Of
peter bunge
Sent: Wednesday, March
Is anyone working on one? has anyone made one work? or not done so well at
it, and learned something?
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Surely you've effectively got 10 of those resistors in parallel so the tube
current is 10x rated
Poor old anode
David
On Wed, 31 Mar 2021, 23:02 Jon, wrote:
> You're putting AC across the tube? In addition to what Paul said, think
> about the scenario in the negative half-cycles.
You're putting AC across the tube? In addition to what Paul said, think
about the scenario in the negative half-cycles. There you've got ten
'anodes' (the display digits, normally cathodes) each with their own
resistor pouring current through one 'cathode' (the normal anode box/grid),
which is
You should calculate the anode resistor you need for one segment. Use that,
then connect all the cathodes to ground. I have done this many times
accidentally. Now the hand waving part: Imagine the connection between the
anode and cathode is a resistor and you connect all of the cathodes
Very interesting; thanks for posting.
You might want to try successive numbers of lit cathodes, say 01, then 012,
then 0123, etc and see how the current increases, and also see if it
changes over time due to heating.
I dont recall seeing this behavior with segmented tubes, like the 7971. In
Just a guess, but I think by lighting them all up you get some kind of “super
ionization” in the tube, which could then increase the current and heat
dissipation.
Bill
From: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] On
Behalf Of Yohan Park
Sent: Wednesday, March
I have a few Chinese QS30-1 tubes lying around which don't have much value
for me and was wondering how it would look to have all digits lit at the
same time.
So I looked up the specs which say 170V and 2.25mA
So I calculated the needed resistor to have it hooked up to 230V which is a
little
