David, I need to consult you about the rubidium oscillator. I am
wanting to set one up. Can you offer any hints or tips
on dividing down the osc. Freq. (10 mHz, I think it is, and typically
powered by 24 volts DC). Any of your thoughts
will be helpful. Thanks, Chuck
---- Original Message ----
From: "David Forbes" <nixiebu...@gmail.com>
Sent: 4/19/2021 1:26:52 PM
To: "NeoNixie" <neonixie-l@googlegroups.com>
Subject: Re: [neonixie-l] CRISTAL + CAPACITOR = TIME DELAY HELP
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
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