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Running in problems with nixie tube clock

Rearthbound

New Member
Hello, Recenelty i have been trying to build a nixie tube clock but i have run into an issue and i'm not sure what it is, I keep frying my K155ID Driver IC's S
I was perfectly able to make the nixie tubes run trough all its digits when it was wired on a breadboard but when it on using the setup below, All of the digits turn on for some reason.
92505798_540904926840483_3926969593226067968_n.jpg
And now when i try to use those k155id drivers the issue remains even when i use them on a breadboard now. So i have fried them i assume.

Let me run you trough the Setup i have right now.

So currently my circuit exists out of 4 Parts:
1:The display
Basicly all the pins of the individual nixie tubes go to an array of 40(2x20) male header pins.
92459259_241129913607048_4360135942883770368_n.jpg92227009_1055221978167483_2782911393584644096_n.jpg
circuit:Nixie display board.PNG
These 40 Pins are Connected using a ribbon cable:
92638651_812418532588353_5425757985181794304_n.jpg
This ribbon cable goes to the Driver board:
Now this board is just a complete mess and i think the issue might be here... (The K155ID drivers are not inserted in the pictures)
1586351158490.png92210828_1090848037961666_820514555137359872_n.jpg
circuit:
OLD DRIVER BOARD.PNG
Then i am left with 16 Pins Wich go to the Microcontroler board using Female to Female jumper cables.
Microcontroler board: The Code and the RTC are not really important in this thread since the issue happens before i upload the code.
92436936_229221041652770_9019475748741709824_n.jpg
Micro controler board.PNG
The Nixie Tube driver:
Now this thing is pretty cheap, Could this be causing it?
92368573_249998686129789_6404155044198875136_n.jpg

What have i changed:
Instead of the complete mess of a driver board i have right now i descided to split up the individual drivers, it would be handy to directly attach the nixie to the same pcb but the Nixie tubes are soldered pretty permantly on their pcb...

Basicly i will use single female to female jumpers instead of the ribbon cable, i will attach those from the display board directly to the driver boards.
circuit:
1586352078471.png
Also i decided to make custom pcb's for these and order them (actually the first time i made custom pcb and im really proud of them :D)
Nixie segment.PNG
Anyone know What else could be causing this issue ?
DISCLAIMER: Exuse my language English is not my native language (dutch)
Thanks in advance!
 

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Nigel Goodwin

Super Moderator
Most Helpful Member
DISCLAIMER: Exuse my language English is not my native language (dutch)
No problem, your English is excellent - as is that of 'most' Dutch - particularly in the East. If you hadn't mentioned English wasn't your first language, I wouldn't have known.

My daughter lives in the Netherlands (Hengelo in the West), and pretty well no one (outside the University) speaks English round there, although her Dutch husbands English is excellent (he's originally from Daventer).

As for your problem, as you say your driver board is HORRIBLE :D

I would suggest you wait for your PCB's to arrive, and see what happens then - obviously at the moment there's something connected wrongly, as it worked on breadboard, and doesn't now.
 

Rearthbound

New Member
No problem, your English is excellent - as is that of 'most' Dutch - particularly in the East. If you hadn't mentioned English wasn't your first language, I wouldn't have known.

My daughter lives in the Netherlands (Hengelo in the West), and pretty well no one (outside the University) speaks English round there, although her Dutch husbands English is excellent (he's originally from Daventer).

As for your problem, as you say your driver board is HORRIBLE :D

I would suggest you wait for your PCB's to arrive, and see what happens then - obviously at the moment there's something connected wrongly, as it worked on breadboard, and doesn't now.
I just really dont want to fry another set of k155id drivers as they take ages to arrive.
 

dr pepper

Well-Known Member
Most Helpful Member
Your schematic does not show current limiting resistors on anode or cathode pins.
If your actual circuit is the same the current through the nixie segments will be very high, possibly blowing the drivers.
And going off the blue glow in the tubes which is most likely the mercury glowing, this is the case.

Edit: I've never used the '155 drivers, maybe the o/p current is programmed by a resistor or something.
 

Rearthbound

New Member
Your schematic does not show current limiting resistors on anode or cathode pins.
If your actual circuit is the same the current through the nixie segments will be very high, possibly blowing the drivers.
And going off the blue glow in the tubes which is most likely the mercury glowing, this is the case.

Edit: I've never used the '155 drivers, maybe the o/p current is programmed by a resistor or something.
I do not have those.. ill look into that, thanks!
 

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