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I've used IN-12 nixies and the code is the one written by the author of this innstructable.It doesn't have RTC function. I have tried using a code by another user - ruizgerman ( you can find it in the comments below) which has a RTC and anti ghosting program, but it did not work for me.Another thing you should be aware of is that you have to use an Arduino to flash the microcontroller. I tried using an AVR programmer but it didn't work, the fuse bits and oscillator frequencies were all messed up. I think it might be possible, but I don't know enough about these things.
Sorry I can't upload an image of my board because I put it in a case and it will be a pain in the *** to take it out. I will try to show you on the board template:The red line is the high voltage. You have to connect the HV output to it (the easiest way is just to connect it to the +180 V test pin)you will also need to connect the HV board to GND and +9V VCC, but that should be easy.Hope I've helped you :)
I solved it by making a new high voltage board and connecting it to the existing one. The schematic is the same as this one and it works, here's a link:https://www.instructables.com/id/High-Voltage-Power...As far as what the problem in the original one is, I have no idea but i suspect it might be a non working element, although I couldn't detect which one.
I have the same problem. It only shows about 8 volts. Have you found a fix for the probslm?
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