David! I was just taking a look at your Nixie watch diagram, what is the function on the resistor R11 = 510K on the Crystal circuit of the pic.
For getting better readings on the output oscillator? Thanks a lot. El lun, 19 abr 2021 a las 19:26, David Forbes (<nixiebu...@gmail.com>) escribió: > My Nixie watches have a variable 5-30pF capacitor on the crystal so that I > can adjust the oscillator to exactly 32768 Hz. You could use a different > value depending on your crystal characteristics. I use an old Hewlett > Packard universal frequency counter, running in time period averaging mode, > measuring the time period of 10,000 cycles of the oscillator. > I connect an oscilloscope probe to the oscillator output pin on the PIC > computer to achieve minimum loading of the crystal circuit. I have to > adjust it to run a bit slow with the probe connected, to get proper > timekeeping when the probe is removed. > I can adjust it to within one second per week using this technique. I've > done this on 2000 Nixie watches by now, so it works. > > > On Mon, Apr 19, 2021, 1:23 AM MrThe50sanchez <the50sanc...@gmail.com> > wrote: > >> 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 neonixie-l+unsubscr...@googlegroups.com. >> 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 neonixie-l+unsubscr...@googlegroups.com. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/CAPbqtvfXMhwT4BZLp64Rn_1SpMxDa-46RBVcpLMgkb0-4fFxMw%40mail.gmail.com > <https://groups.google.com/d/msgid/neonixie-l/CAPbqtvfXMhwT4BZLp64Rn_1SpMxDa-46RBVcpLMgkb0-4fFxMw%40mail.gmail.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 neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CAMyLbsEtwfTLvQpEzTOd%3DeVaE-fvs9vudZO%3DGQWoW19%2B6%2BTcNg%40mail.gmail.com.
