fernando, if this is a video of something you built, you REALLY, REALLY need to describe to picaxe users how you decoupled the high voltage nixie tube supplies from the 5 volt logic supplies! The subject of supply by-passing, common grounding (or otherwise) and the like comes up all the time. This is a video of almost the worst case scenario (from a voltage, rather than current) perspective.
I was planning to post a description, but some relatives whom I hadn't seen in a while, paid a visit...... anyways, they are gone now.
Yes, some voltages are scary!
The key here is
isolation. Start with a 12VDC isolated supply, form which you will derive all the other voltages.
The 5V logic supply is trivial. Use your favorite regulator o step it down.
For the 170/510V Nixie/Dekatron supply, it is best to purchase a voltage step up kit specifically designed to power such loads safely.
Since both the 5V and the HVDC supplies share the same primary power, their ground returns are shared.
Where did I purchase the Nixie/Dekatron supply? There are many available on everyone's favorite marketplace, Ebay.
I decided for this one
https://threeneurons.wordpress.com/ , for the simple reason that Mr. Moorres provides one of the best Dekatron and Nixie tutorials anywhere. I always like to support individuals who make an effort to provide their valuable knowledge for free on the web. Go thru that website, and you'll find everything you need to know about Nixies and Dekatrons and other interesting stuff.
He sells kits thru his website, which link to Ebay.
The website also provides a description on how to build a microcontroller interfaces
As mentioned before, the voltages are scary, 170V for the Nixies, 510V for the Dekatron.
Therefore before designing this project, I first purchased one of the standalone Dekatron Spinner kits featured on the website. It will allow you to become acquainted with its operation.
After assembling the kit and playing with it for a while, I became knowledgeable enough to attempt my own Picaxe design.