Well, my current setup does not allow to vary the drive current, as that
would require a custom HV supply capable of rapidly switching between
regular operation(say, 170V), and "extreme" mode, at maybe 220-260V.
By all means, try it out. It could work, but I have no predictions on the
outcome be
Still wondering if the CPP process can also be used to clean a contaminated
tube over time as opposed to just trying to prevent poisoning. I’m wondering
about applying a higher power pulse for a short duty cycle so that the CPP goes
a little beyond normal operation. A cathode can poison even
@Jeff The heating should only be enough to prevent cathode poisoning
starting with a healthy(ideally new) tube. I seriously doubt it would do
anything to fix already existing cathode poisoning. It's driven using the
same, standard current(4-6mA for an IN-18) for normal operation.
To fix existing
The high speed cycling makes a lot of sense when the "slot machine" effect
isn't desired.
I guess the harder question is how much a rapid cycling is enough.
>From the standpoint of creating a look and feel for the clock, I would
implement 20ms of cycling (10 x 2ms) done every second when secon
Like the other thread about the FLW clock, I missed the fact that this
driver also has rail-to-rail drive with a high-voltage supply pin (76
volts).
That will clamp any leakage current from the nixie tubes, so a bleeder is
not needed. ESD structures in the IC are designed to clamp hundreds of
m
Question: is the cycle long enough to effectively heat the surface to drive
off the contamination? Are the pulses being driven at a high current for the
milliseconds that they are on? By high current, I'm speaking of a rate that
exceeds nominal by say- 2x to 3x? My understanding of the physic
No Failures here. Mine's been running for 8 years now!
On Tuesday, March 6, 2018 at 8:58:46 AM UTC-8, gregebert wrote:
>
> Interesting. The HV5812 is a CMOS device rated for 80V, so it will be
> vulnerable to overstress if the nixie tubes leak (no bleeder resistors are
> present).
>
> Has anyon
Sorry, I did miss that. It definitely solves any potential problem with
nixie leakage, clamping it to a safe value. Much better solution than tying
a bleeder resistor across each segment driver.
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On Monday, March 5, 2018 at 7:14:56 AM UTC, gregebert wrote:
> The MAXIM device uses BiCMOS technology, so the I/O pins are
> probably NPN devices and should be more tolerant of voltages above
> 76 VDC.
I'd prefer not to allow the voltage to rise that far. 70 volts seems
to be enough to reliably b
While designing my own clock, I decided to investigate the cathode
poisoning prevention methods utilized by most clocks, and I discovered that
there's room to improve and experiment.
Here's a short video: https://www.youtube.com/watch?v=skBwGGQ58MI
If you can't or don't want to watch: Switching b
You obviously missed that in my design, pin 1 of the HV5812, the VPP pin,
is tied to approximately 60 volts. An "off" output then is pulled up to
60V, which is high enough that the cathode is extinguished, and any leakage
current is clamped to 60V.
On Tuesday, March 6, 2018 at 8:58:46 AM UTC-8,
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