I highly recommend a DS3232; it's very accurate, has the internal crystal, and requires very little power.
My nixie watch debug board has been sitting in the garage and has not been adjusted since March 2015 and it's gained less than 2 minutes after 6 years. Another interesting fact is the battery (used 1100mAh cellphone battery) will need it's first recharge today after 6 years of usage. Most of the time it sits there with the display off, so only the RTC and the leakage of the voltage regulator cause the battery to drain. But it's rather amazing that a well-used Li-ion battery could last that long on a single charge. On Monday, April 19, 2021 at 5:34:49 AM UTC-7 Bill van Dijk wrote: > If you are still slow with the 10pF, a 12pF is not going to do it. The > relationship between the crystal and load capacitor is critical, and it is > therefore a mystery to me that so many (of the cheaper) are sold without > the specifications. Anyway, if yours is a cheap Chinese crystal, try some > other ones, perhaps you just got a bad one. Generally I always like to get > a good brand name crystal. If you want to play with the one you have, try > something lower yet, 8 or 7pF. > > > > In general terms, and within limits, larger cap slows it down, smaller cap > speeds it up. Sometimes (if you use 2 caps) using a slightly different cap > on one leg of the crystal can make a difference in the final frequency. > > > > Bill > > > > *From:* [email protected] [mailto:[email protected]] *On > Behalf Of *MrThe50sanchez > *Sent:* Monday, April 19, 2021 4:23 AM > *To:* neonixie-l <[email protected]> > *Subject:* [neonixie-l] CRISTAL + CAPACITOR = TIME DELAY HELP > > > > Hello Guys! > > > > I have a nice question to ask you guys if you can give me some help. > > > > I builded a Nixie watch, It works good, but I'm having a little bit of > time delay, 1* min within 6 hours. * > > > > At the *first time,* I had 6 min delay for 6 hours aproximately. I > investigated the relation of the cristal and the capacitors you need to > install with it. First, I had 22pF for a cristal that requires 12.5pF, > giving me that 6 min delay for 6 hours, then, I realised these and > installed 10Pf capacitor and the delay decreased to 1 minute for 6 hours, > and I just ordered new capacitors of 12pF to get more closer to the > manufacture requires, So I imagine that the delay is gonna get less. > > > > ·Is there any way to make this time delay shorter? > > ·Do you recommend me a tipe of cristal that is really acurate to install > on my watch? > > > > Thanks a lot nixie lover's > > > > -- > 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 view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/7ce2b557-f652-44b2-a71f-ed75b96ea06fn%40googlegroups.com > > <https://groups.google.com/d/msgid/neonixie-l/7ce2b557-f652-44b2-a71f-ed75b96ea06fn%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- 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 view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/e504be4d-de5f-41fc-8be8-7d16015f50b7n%40googlegroups.com.
