For the battery-powered clock, I'd suggest 2 separate batteries. A coin-cell for the timekeeping chip, such as DS3231, and another battery that handles everything else. There are some DC-DC converters on Ebay that might work for the nixies; no idea about quality or efficiency but for $7 US you can afford to experiment. 3.7 V Li-ion might be a good starting point for your main battery; lots of choices (size, capacity) at low-cost thanks to smartphones.
FYI, my nixiewatch debug board has been running for 2 years now on the same battery (a worn-out cellphone Li-ion), with it's initial charge, and it still has the correct time. Those RTC chips are very stingy on power, and very accurate. I'm doing a different twist on the battery-powered clock. It will have a 12V sealed lead-acid battery, and a dynamotor I salvaged in the 1970's. Noisy, big, heavy, inefficient, and spectacular show-off item. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/26838fe2-4bcf-41be-b58c-c99ae9a4e178%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
