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Here's the code for my build. I posted description and photos in the projects forum here:
http://www.robotpirate.com/forums/index.php?topic=4.msg638#msg638

Code highlights:
- 6 digits + 4 separators + 3 mode indicators
- 2 Inputs: standard button and rotary encoder (with button)
- Uses DS1307 RTC to keep time/date while display off (~9yr lifespan)
- Standard modes: time, date, and countdown timer.
- EASY setting: Press encoder, dial up/down SS, press for MM, press for HH, press to confirm
- Cathode poison prevention mode can be activated on startup (hold pushbutton at end of tube test)
- Countdown timer displays HH:MM:SS above 1min and    SS.DD below 1min
- Uses MCP23008 Port Expander
- Does not use millis() for time
- Does not use delay() for multiplexing

Feel free to use any way you'd like.
Enjoy!

---------------
Note: While this post is the only place I've uploaded the code myself, I'm told it's mirrored here:
http://www.mediafire.com/download/896lp66lb2jm2n7/Nixclock_r9.zip

I can't say I've ever downloaded it and made sure it's the same, but if you don't have a forum login and can't get to the download, that should work better for you.

Looks like my post here got manged by a forum changeover.

Details of the build are here: https://plus.google.com/113825690086131396297/posts/3YxUHktmzoH

I have the 6 Digit  Code adapted to make it working with 4 digits, Fading, Dots, RTC and Pushbuttons.
And i have take alot of comments in the code

[code]// 4 Digits + 2 Dots + Fading + Button Time Set + RTC  (default connections).
//
// based on 6-tube sketch by "Emblazed"
// 4-tube-itized by "Dave Blevins" 16 June 2011
// this shows minutes and seconds only
// COLON-alized by "Carnifex Maximus"
//
// Combined and Modified by "Dreiduke" (Falko P

i have tested the Tubes, with such a thing

]http://www.amazon.com/gp/product/B00008GS96?ie=UTF8&tag=elecflykiller-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=B00008GS96[url]

http://www.google.com/imgres?imgurl=http://electric-fly-killer.com/wp-content/uploads/2011/01/charcoalbugzapper.jpg&imgrefurl=http://electric-fly-killer.com/&h=300&w=300&sz=12&tbnid=s1Igz4geeXJj8M:&tbnh=90&tbnw=90&zoom=1&usg=__GEXGHN3P3hYKSs-rVQd9SKoyjBY=&sa=X&ei=NfQ5UKO6FdDbsgaVmIHICw&ved=0CEMQ9QEwBQ&dur=620

Problem solved!!! stupid problem I must say, but solved . Because I made my own power supply from the Arduinix schematics I used a 5volt supply as input voltage. That was the reason the output voltage reached only 140Volts, after correcting this problem en raised the input voltage I got the correct output voltage .
For the problems that occurred on the breadboard, well the problem was the breadboard .

I used the Arduinix schematics to create a power-supply for my project, but there seems to be a problem with my design.
At the start of the 1k trimmer at 0% (0 Ohm) I have a voltage of 95Volts, when I start to increase the trimmer the voltage reaches about 140Volts after that the Voltage collapses to 95V again.
I watched the out signal of the NE555 and after the 140V the signal gets very unstable.

The next step i did was building the power supply on a breadboard because the most of the components on the PCB are SMD, but it got worse. The voltage does not get higher then 70-80Volts. All the components are connected as in the schematics and there are no faulty connections. I measured the signal on pin3 of the NE555 it stays between the 180 and 210Khz, and sometimes the coil L1 gets quite hot is this normal?

What goes wrong? I'am not an expert on electronics so is there someone that can help me or at least put me in the right direction?

Thanks in advanced,

Yes,I have a rtc module working in my nixie clock.

 Time setting is done with the computer, because I did not want to add any buttons on my pcb

Hello.

Has anybody implemented the cathode poisoning prevention in the code?

I have built a Nixie clock with an Arduino Nano based on the code from Arduinix.
I have implemented a rtc modul and now I am thinking about the cathode poisoning prevention.

 But I have no idea how to do that.

Has anyone integrated a RTC with the arduino and the arduinix  to keep better time

Did anyone find a good setting? Mine is fast at 1000 and to slow at 1001