Would you be able to elaborate on how the transformer prevents the inrush
current? I'm a bit new to using transformers for anything. Also do you have
a part number suggestion?
Currently for my ILC1-1/7 VFD project, I'm using a SiP2100 hbridge to
generate my filament voltages that inverts
these don't come up very often..
https://www.ebay.com/itm/IN-5B-1-Nixie-Neon-Tube-USSR-Rare-5-1-New-1pc-or-more-/392421721278?&_trksid=p2056016.l4276
Not my auction etc
Cheers,
Nick
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I'm pretty sure the the reason for progressive dimness is because of the DC
bias is different on each tube. The brightest one is closest to GND; as the
tubes get closer to the + filament supply, they get dimmer. I suggest
running them in-parallel from an AC source, or a +/- square-wave that
I thought this was worthy of a separate discussion.
Small VFDs, and even NIMO tubes, use the filament as the cathode and in
doing so the filament is the sole source of electrons to produce the
glowing segments. So, some of the filament current is going towards heating
of the filament and some
The transformer doesn't play a significant role in limiting inrush current.
A filament behaves like a thermistor; at cold temperatures it has a lower
resistance, but as it heats-up, it's resistance increases. So, when you
connect a voltage source to it there is an initial surge current (I=
I took a look at the LM9022 datasheet and it's drive method seems similar
to my H-bridge + oscillator. I've built and tested it but haven't ran it
long term with my ILC1-1/7s. I'm still looking for anything to improve on
before I finalize the driver for my clock.
[image: 3.PNG]
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You
> On Sep 13, 2019, at 12:15 PM, Nicholas Stock wrote:
>
> these don't come up very often..
>
> https://www.ebay.com/itm/IN-5B-1-Nixie-Neon-Tube-USSR-Rare-5-1-New-1pc-or-more-/392421721278?&_trksid=p2056016.l4276
>
>
Excellent explanation, Greg.
> On Sep 13, 2019, at 2:31 PM, gregebert wrote:
>
> The transformer doesn't play a significant role in limiting inrush current.
>
> A filament behaves like a thermistor; at cold temperatures it has a lower
> resistance, but as it heats-up, it's resistance
Those are very cool-looking tubes !!
Are you connecting filaments in-series ? If so, when you run them on DC
there will n=be a net bias and that will cause non-uniform brightness
Even if the filaments are in-parallel, there will be some DC bias that
makes some segments dimmer.
A center-tapped
