The MM5369 produces a 60Hz signal from a 3.579545 MHz crystal, not 1 pps. I vaguely recall that there was a version that produced 50 Hz from a PAL crystal.
The MM5369 can be found on ebay for about US$1 in medium quantities. These may be Chinese counterfeits, but it is not a technologically demanding application, so it should work fine. If you cannot find an old NTSC TV to cannibalize, the crystals are available new for about US$1 from the usual hobbyist surplus stores ( e.g., https://anchor-electronics.com/price-list.pdf ). One additional thought is that the backup battery should physically mounted in a low location , preferably in a container that keeps it separated from the electronic circuitry. I once made the mistake of mounting it in the case above the circuit board, and the electrolyte leakage damaged some components (including some IC chips). > -- 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 neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/038477d3-76c2-490d-ae1f-39add63712ff%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
