On 7/16/16 12:08 AM, John Swenson wrote:
Yes, I was planning on using a high speed photo diode to actually measure the turn on time of the digits. I hadn't thought of the turn OFF time, do I want the old digit to be turned off before the new one lights up or for them to be overlapping? I have been thinking about what threshold to use, 50% intensity is probably about as good as any other. It might turn out that different digits turn on differently, so I will have to calibrate each one separately.
Looking at my 5326 nixie tube counter I would say that the capacitance of the digits will be different: they're different areas and different spacing from the grid in front. So I would expect the time constant on the drive circuit to be (slightly) different. On the 5326, I believe the drive circuit is lightbulbs and photoresistors (having not looked inside in many years)
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