Nice clock Mitch. Will you be offering a kit or the PCB for sale? I'd like to get one but lack the chops for all this geek talk you guys are discussing.
On Wednesday, February 24, 2016 at 6:19:12 PM UTC-5, Mitch wrote: > > Thanks! > > I was not aware of that. I'm using a variety of supercaps bought from > Digikey and on ebay. I didn't pay much attention to that part of the > circuit or the values of the supercaps, but I was surprised to find that > one clock had the correct time when not powered for about two weeks. > > > > On Wednesday, February 24, 2016 at 3:24:26 PM UTC-5, gregebert wrote: >> >> Nice clock! >> >> Curious about the capacitor you used for sustaining the DS3231 RTC during >> power-outages because there is a periodic temperature-compensation cycle >> every 64 seconds that takes a spike in current. Datasheet says about 600uA >> for up to 200msec, so each of those will take a bite out of your capacitor. >> If I did my math correctly, a 1000uF cap will drop around 120mV after each >> cycle. >> >> In my case, I was monitoring standby current of my wristwatch (nominally >> < 2uA) with a 50uA mechanical meter, and the temp-comp cycle pegged the >> meter. >> >> >> -- 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/5834911a-923e-4a19-be3b-ecba78f07178%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
