One more thing those Elm modules were meant to be just a short term fix when the power gid went away or for battery operated situations....not a long term time base...regards...
On 27 June, 20:09, threeneurons <threeneur...@yahoo.com> wrote: > http://www.elmelectronics.com/ebench.html#Oscillators > > | Larry <unmitigated_f...@earthlink.net> wrote: > > | I recently completed a Kabtronics Nixie clock that uses line > | frequency. Now I'm going to have to add a 60Hz generator to it. > | Thanks for the link. > > If you can change the input source (3.58MHz xtal), or tweak it, you > might just want to leave things alone. > > There are 525,960 minutes in a year, on average. 525,600 for a normal > year, and 527,040 for a leap year. Being off 20 minutes in a year > works out to ~38ppm (East Coast). 8 minutes comes out to 15ppm (West > Coast). A typical crystal has 30 to 50 ppm accuracy, or between 15 to > 26 minutes off, in a year. You'll get no improvement with a common > crystal. You might just as well just stick with the line sync, and > just occasionally hit that minute button, to correct the time. > > That module won't help you unless you swap out that xtal, and tie a > TCXO to the clock input. Of course, you'll need to match the > frequency, or write your own uC code. A TCXO has an initial accuracy > in the 1ppm to 2.5ppm territory. Even when extra errors, such as aging > coming into play, you're still a lot better off than using a cheap > xtal. > > I actually use to sell a coded uC (a tiny12 in fact) on eBay, that > outputed 50Hz, 60Hz, and 1Hz. Sold it for $5 each. Maybe I should just > post the source code, to screw with that guy. Code is pretty trivial. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
