On Mon, Feb 11, 2019 at 10:15 PM Nick <[email protected]> wrote:
> Yep. Genuine ones are very precise > > Where did you source yours from? > I got them from Aliexpress (2 pcs in 8/2016 then 3 pcs in 7/2017) and Banggood (3 pcs in 11/2018). I think the batch of 3 from Aliexpress that came without battery had DS3231SN, because I have three of them, but I did not keep so detailed records. OTOH I noticed that the ZS-042 board with DS3231SN is a deeper blue color than those with DS3231M. Coincidence? Interestingly the only DS3231M in service, outputting 32701 Hz, exhibits good precision, gaining maybe 5 seconds/month, and it is not running at 25°C in there. I use the 1 Hz output to do Nixie effects and re-read date/time from RTC every 60 seconds. So, if it is a Maxim chip, it must have some sort of internal factory calibration. Otherwise it is a microcontroller pretending to be an RTC, with some sort of software calibration to hide its nature. BTW, all boards have the charging circuitry for LIR2032 but came with CR2032, when installed. Paolo -- 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/CABj2VaagUasyGJRk2ydmrVt05yfaRjq7%3D6Am6QniG%2BZiDsW%3D4Q%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
