..or (if you have room for it) use one of those vintage master clocks e.g.
like this one:
http://www.ebay.de/itm/TN-T-N-Hauptuhr-Mutteruhr-Nebenuhr-50er-Jahre-elektrische-Prazisionspen-/230725324606?pt=Kamin_Standuhren&hash=item35b84d0f3e
They can probably be modded to deliverng a second pulse without too much
trouble.. or use some software to accept its minute/ ½minute or whatever it
delivers of sync signal.. :o)
I have one of those clock - got it up and running, but I haven't so far
connected it to a nixie clock..
Dan
----- Original Message -----
From: "Jonathan Peakall" <[email protected]>
To: <[email protected]>
Sent: Sunday, January 22, 2012 5:08 PM
Subject: Re: [neonixie-l] Mechanical Timebase!
Tim,
You could do a simple acoustic detection thing with an electret
microphone. Cheap and simple and should work fine. That way nothing
touches the movement or impedes it's display.
Jonathan
There is always a lot of discussion about various timebases for clocks on
this group. One I have never seen discussed is using a high quality watch
or clock movement. I have some real neat antique pocketwatches. I thought
it would be real neat to set up a pocket watch movement where you can see
all the works (It would have to be in a dust proof enclosure.)in
operation. I thought you could pick off the oscillations of the balance
wheel using a fiber optic through beam photoeye on one of the photoeyes
made for detecting tiny objects. I see these in my industrial maintenance
work from time to time. The watch could be set up with a electic winding
mechanism. With the photoeye output (Usually 9-24 volt sourcing or
sinking depending on the photoeye.) all you would need is some divider
circuits to produce your timebase signal for a clock. Nixie, numitron
etc.
See WIkipedia Balance Wheel. A good 17-23 jewel watch movement sitting
in
one position a constant temperature can be very accurate.
Tim
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