The biggest challenge is designing a high-efficiency DC-DC converter for the tubes; it is the primary consumer of energy. Generally, you will get higher efficiency at higher battery voltage.
Next, you will need to determine the battery size/voltage/capacity. I gathered a lot of data about various storage technologies (NiCd, Li-ion, NiMH, lead-acid, supercapacitors). Conclusion is what I expected: Li-ion. There are all sorts of Li-ion cells in various size, shape, capacity for phones, tablets, and laptops. Li-ion also has the simplest charging algorithm *as long as you dont fast-charge*. If you just want a portable clock, I'd start with Li-ion battery-packs for power tools. Then you can just use the existing charger. I'm working on a dynamotor portable nixie clock, and it will use a sealed lead-acid (SLA) battery. Heavy, noisy, but very cool. -- 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/b4d8ba83-2d14-48f8-8ccc-c960e8a33a36%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
