I have built up my second part of my clock and was happy how it looked, but when I plugged it in only the number 4 displayed on both second nixies. Seconds as in NOT hours and minutes!
Bulb number 5 (tens of seconds) only showed a nice number 4 and bulb number 6 (unit of second) showed number 4 with a mix of others appearing all at the same time, but number 4 stayed bright all the time.
I did have a problem before on the board, trying to get HV to begin with, and changed the mosfets and atemga chip, but didn’t change the k1551 (I think it is this number??)
Could that be the problem?
What else should I check first?
Don’t panic, hold the press, I have found the problem!!
Stupid me had the ki551 the wrong way around!!
When I was swapping things over to the new board, I couldn’t remove the header that the chip sits in, so I cut down one I had to fit.
Then not looking at the diagram, I just put the chip in so the writing was the right way up.
But as it happens, the chip I have, has to go in with the writing the wrong way up!
Don’t ask me why, but it now works and I have perfect seconds counting way beautifully.
Now it’s just a case of wiring in the minutes and hours.
This forum is great, you can even answer your own questions!
I have a similar problem. I build the arduino kit clock and I'm testing the first tube atm. First everything was fine but on the second startup the tube shows 4,6 and 0 at the same time, occasionally showing 8 as well. The nixie driver is mounted the right way and the board with every solder connection looks fine.. I'm using IN-16 tubes and therefore 5cm connection wires to the pins. How to check what's wrong? What could cause multiple numbers to light up at the same time?
Hi Alf: If it had been firmly stuck on "4", my money would have been on the decoder either the wrong way round or defective. If you are occasionally getting other numbers showing up, that puts that theory under suspicion. Could you make a short video of the problem?