Full build of a smaller 8 neon nixie lamp. (files on website)

I like the larger nixie lamp, so I decided to rattle up a smaller version based on the matching smaller LED lamp kit form eBay.
You can download the file and viewer/printer at:- http://www.bigclive.com/freebies.htm
This version has only got eight neons, so it's easier to build, and the component layout on the back of the PCB is also very uncluttered making it an easy PCB to build.
It uses two resistors (220K for 200 - 250V and 47K for 100-120V) to charge a small 10nF capacitor via a standard 1N4007 diode. When the voltage across the capacitor exceeds about 90V a random neon will conduct and discharge the capacitor via a 1K resistor. This results in brief flash from the neon, but because there are a lot of matched neon lamps in parallel the one that conducts first will be very random.


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