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I am working on a document version of the operating instructions for the clock that is easy to print.

Can you provide any details on what the various decimal positions indicate? To clarify, the 4 numeric nixies have a total of 8 decimals (one on each side of the numeral). It seems like a decimal represents alarm enabled, another may be auto-dimming, etc. Can you confirm this?

Also, if there are any details on the GPS input you would want to include please let me know.

Thanks.

You could include these from the 'options and mods':

GPS input - 5V TTL level serial data at 2400/4800/9600 BPS (auto detect). Wire up a jack plug for SK2 as follows:

Tip - Ground
Centre barrel - 5V
Outer barrel - Data out from GPS.

Fit wire links in places R14 (upper) and R27 when building the PCB if you intend to use this in future.


Louder/quieter alarm: Reduce or increase the value of R12, acceptable values are from about 27R to 220R+


Brighter LEDs: Reduce to value of R6,7,17,19,22 to a min. of 470R. To remove the LED feature just bridge D2-6 with solder.


The DPs indicate from left to right:

Alarm set,12/24 hour mode selected,PM. The rightmost DP isn't used as yet.

If you need any more information just ask.