[time-nuts] GPS for Nixie Clock

David 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.
>John S.

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