[time-nuts] GPS for Nixie Clock
davidwhess at gmail.com
Sat Jul 16 10:49:21 EDT 2016
Use AC coupling to each digit to measure the ignition waveform and
detect the breakdown point like with a tunnel diode trigger. Use a
higher compliance voltage and greater negative resistance (constant
current drive?) to lower breakdown jitter.
On Sat, 16 Jul 2016 00:08:45 -0700, you 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.
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