I finally migrated to the new NeoNixie list today.
I just received three near-simultaneous phone calls from friends and
family who were watching CBS, informing me of a Nixie watch sighting.
I gotta get another phone line. Two isn't enough.
--
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it, and
keep it at a constant temperature such as in your living room.
You can get fancier - the sky's the limit for time nuts. Buy three
cesium clocks at $60,000 each and compare them.
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the beam
switching tube. He should be amenable to that, and since his web page is
considered the Holy Grail of info for these tubes by the Wikipedia crowd, your
outlook on life may improve. We'll see.
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some wood and lots of wires.
http://www.nixiebunny.com/malmbergcalc/calc.html
Revel in the amazing craft skills of yore.
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is powerful enough to kill you.
A nixie tube uses only a few mA of current. Why run the risk of
electrocution when you can buy something like a Tayloredge switching
supply for $12 and be safe?
--
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wrapping for the HV side of a clock? Can I stay out of trouble by
careful routing or possibly using a layer of tape between anode and
cathode layers?
The cathodes are about 50V, so you only need to worry about the anodes.
Use regular 300V hookup wire for those and you'll be fine.
--
David
-PRF-1/prf1ss1178.pdf
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(USD45), USB, very fast,
all 16F and 18F chips supported. I love it!
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except a 22kohm pullup resistor on MCLR.
Try it, you'll like it!
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at
least six diodes and ceramic disc capacitors.
I can look for any documentation I might have.
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an intuitive user
interface?
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for 6 way multiplexing in the
clocks I made, so 1.4x seems reasonable for 2 way. It takes
experimentation to find the best value, and there is a tradeoff of tube
life vs brightness.
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, then divide voltage by
resistance to get current.
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I also am taking orders for Nixie watches again, if anyone's interested.
I have about 6 months of backlog to work through.
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and there are details on
them that differs from the IEE displays I have seen so far. F.ex. the
lamp sockets with their soldering lugs looks clearly different.
The listing says of the same kind as the IEE... which means that they
are not made by IEE, but similar design to IEE displays.
--
David
aware of, not having 35 years of experience
making mistakes in electronics construction as I have.
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nixie tube, to see if there's some leakage
in the proto board that's making that seven light up. If it's the board,
then the symptom should move to another cathode when you swap their pins.
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TD62084 Darlington driver
arrays work just fine. They cost about 1/4 the price of a Supertex chip,
and come in DIP form so they're easy to use.
They need a Zener diode and resistor to hold the commutator diode pin at
~50V.
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they have very low current
and high voltage. 100 feet of 30 gauge wire would be acceptable if needed.
The primary wires should be 24 gauge wire or larger, to handle the
Ampere or so of current draw.
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On 2/16/11 4:22 PM, Dieter Waechter wrote:
Hi friends,
I'm looking for many SK-207 base tubes with + and -.
You know the SK-207 base:
http://www.tube-tester.com/sites/nixie/data/soc/SK-207/SK-207.htm
Who can help?
Dieter
I bought them last year. Sorry.
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. (Maybe it was David Forbes?)
Not sure..
Anyways, yes, multiplexed and 2.6ma is fine.
-Adam
The formula for lifetime is: lifetime is proportional to 1/(I^3).
I found that multiplexing at 2x rated current for 1/6 duty cycle worked
well and gave similar lifetime to direct current.
I have a clock
Apple is at the top of the game - they thoroughly understand
this principle. Steve Jobs is legendary for not accepting good enough.
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comparison would be nice.
I know the story of too many projects. Ask me about scope clocks. My
latest project is taking all my brain time. It should be worth it, though.
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shipped your watch back Friday. You should get it in a few days.
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assured that whatever
you guess the composition is, it will be wrong.
You might consider, if you're serious, paying a metallurgist to tell you
what the compositions of the metals in a real Nixie tube are.
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On 3/8/11 6:26 AM, Jeff Thomas wrote:
Too Funny!
I was thinking something similar, and have it scroll time information
with variable degree of accuracy set in menu ;)
My wife suggested, for us Arizonans with nice sky:
Go outside and check out the sunset
--
David Forbes, Tucson AZ
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. Is it like that tube?
http://www.oddmix.com/tubes/b5440.html
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and between cathodes in the same tube.
A difference of 0.16mA is on the order of 5%, which is nothing to worry
about. I suspect that if you made the tubes display a different 15
digits, you'd see a different current draw.
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of 15K and been done with it.
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. This is the first
impression that their clients get.
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and a 100k
resistor on each decimal place.
Try reducing the DP resistor value until it works well. 100K sounds
rather high.
I'm not sure why you would need any resistor, but I've never fiddled
with Nixie decimal points before.
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, and the other without it lit.
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. This would destroy the logic circuits immediately, as
they can only handle about 5V.
The MPSA42 transistor is needed to provide a path for each anode control
signal to be translated from the 0V level to the 180V level that the
MPSA92 anode transistor bases require.
--
David Forbes, Tucson AZ
On 3/30/2011 11:26 AM, Dan Harboe Burer wrote:
255$??? My God..
.. and I have two of those tubes in my humble collection..
Dan
I hope it was the prankster bidding the shill up to that amount, not the other
way around.
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on the primary side. But which
frequency is required, at which voltage and current?
I purchased one of these red neon tubes from an automobile parts shop.
It has a built-in 12V power supply for use under a car. Just put a
handle with a battery pack on it, and play Jedi Knight!
--
David Forbes
one
end to the other end.
A wire comes to mind.
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the calculator intact!
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On 4/11/11 10:37 AM, David Forbes wrote:
Those tubes are similar to the B5866, which I have a few hundred of.
Oops, I meant to say that I have lots of 5853s, which are the
high-pressure tubes used in calculators.
The 5866 +/- tube is indeed hard to find, but they're usually trashed
On 4/11/11 10:35 AM, Gene Segal wrote:
Now be honest, folks - how many of you have experienced altered states
by observing nixie and edgelit displays?
My state is altered for the better every time I read my Nixie watch.
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to handle 1.5kV.
IEE is still in business. Ask them if part number 14476 is in stock.
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, at least they were manufactured using
identical equipment.
That style of tube was only manufactured for perhaps 30,000 hours, so
the 200,000 hour lifetime claim is an extrapolation.
You will have to reach your own conclusions.
--
David Forbes, Tucson AZ
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in the bulk factory
packaging.
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On 5/10/2011 11:11 AM, micha...@aol.com wrote:
What video?
Michail Wilson
This video.
http://cogwheelcircuitworks.com/
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I rather like the lower-case font. I am surprised that it works as well as it
does. Reminds me of that font that HP laser printers used in the good old days.
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, which could be latches,
counters or some combination of these.
Can you take a clear photo of the top of the board, showing all the ICs?
Or at least make a list of the IC numbers? They'll all start with 74.
--
David Forbes, Tucson AZ
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binary numbers from the three octal connectors,
and displays the sum as a single decimal number.
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it.
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if PayPal were take the entire sales price from me.
I've had less than 1% problem shipments, having mailed hundreds of
small, expensive items all over the world.
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have to stop shipping stuff to Germany.
Members from Germany and the EU, please chime in !
I've mailed a dozen Nixie watches to Germany this year with no
complaints. I use USPS.
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only three small TSSOP chips and
zero transistors, so it's the lowest-parts-count Nixie timekeeping
device I know of. The PC board is 15mm x 38mm. The power supply is on a
separate 40mm diameter board.
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a clock with 6-way muxed ZM1040s that's
been on my mantel for 9 years, still going strong.
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supply on it. Its cost is $75.
1PPS may also be derived from a rubidium clock's 10 MHz output. Rb oscillators
are not too expensive and hold time to within a millisecond per year. I made a
rubidium nixie clock for my workshop:
http://www.nixiebunny.com/rbnix/rbnix.html
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on to designing your next
project.
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putting stress on the pins. That
is, choose a socket pin sized so that the tube pin is near the small end
of the socket's rated diameter range.
You'd be sad if your tubes broke due to insertion stress.
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of misinformation that has propagated through history over
the last 40 years.
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On 6/12/11 5:52 PM, stosk...@tri.net wrote:
Thanks for the correction. Now what do I do with the driver modules I
pulled them out of?
N0UU
Hang them on the wall.
They are nice old-fashioned PC boards, which are art by now.
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Seattle offers the Telephone Pioneers Museum. Fantastic, if you like old
phone stuff.
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The great National chip engineer and Electronic Design columnist crashed
his '69 VW Beetle while driving home from the funeral of Jim Williams,
another great chip engineer.
Details at ED, /. and some other places.
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the laminated acrylic case to make
a kit version of my Nixie watch, with a much lower price point.
I'd have the boards SMT-assembled by machine still, but let the customer
build the rest.
We'll see how it comes out.
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On 6/24/11 8:33 AM, micha...@aol.com wrote:
Jeff,
Did you find a way to make them?
/me wondering where you come up with them all.
Michail
Buy low, sell high.
http://www.nixiebunny.com/b7971ad.jpg
These tubes were available in large quantities at a low price in 2002.
--
David Forbes, Tucson
it on the chip side of the 510k ohm drive-reduction
resistor.
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.
Once adjusted, it's good to a couple PPM at ~20C to 30C (68F to 86F).
One PPM is 30 seconds a year, half a second per week.
I highly recommend adjusting a crystal if you're going to use it for
timekeeping. The hairs you can split with it are much finer.
--
David Forbes, Tucson AZ
--
You
item - note the fancy metal and wooden case work.
It's amazing that it still works after all those 35 years. Those
electrolytic caps look ancient.
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. Of
course today it's fairly trivial to do in a small package, but back
then, I'm not so sure.
A.J.
I used to own an HP 201B audio signal generator. It was powerful enough
to ring a telephone bell, providing 100V RMS at 20 Hz.
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On 6/30/11 9:30 PM, Wayne de Geere III wrote:
You must be a real phone fan to know that proper ring generation is at 20Hz,
I'm impressed!
On 2011 Jun 30, at 20:34 , David Forbes wrote:
I used to own an HP 201B audio signal generator. It was powerful enough to ring
a telephone bell
out there.
I bought a bunch of those tubes on Ebay some years ago, advertised as
new in box, but they were actually old, in the boxes of their
replacement tubes. They exhibited the symptoms you described.
I'd recommend trying some different tubes.
--
David Forbes, Tucson AZ
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block at the top to hold the digits in place.
After all, if you're trying to make it yourself, simplicity is valuable.
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I've been pretty distracted lately, building this gizmo for Burning Man.
http://www.cathodecorner.com/videocoat/
It'll be at the Detroit Maker Faire at the end of July, if you live near
there.
[No Nixie tubes, but it was paid for by selling a hundred Nixie watches,
so there.]
--
David
of the
coat. Getting a second camera to display the person behind me on the back would
be more tricky.
It's been suggested that I could use a rear-facing camera to capture the image
displayed on my front, so as to render me invisible. Harry Potter's dad figured
that one out first, though.
--
David
in bulk, as they are used for that good ol' 12AX7.
The only question is how to connect a big bulb to that little T6-1/2 wafer. I'm
assuming that you'd want to make big Nixies, since there are thousands of little
Nixies floating around.
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of glowing things are often much more glowy than the
same objects appear to the eyeball.
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, but is a modification of my 2-digit Nixie watch.
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. Send me a message offlist.
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supplies can't do that.
Also, if you wish to run the clock/watch off a single 3V battery, then
the Taylor or the LT1308B are your only choices. The inductor-based
designs don't run at 3V input.
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wiring) calling out every component and every waveform's
test point.
But these were television sets full of yummy high voltage, and the
danger of getting a big shock or blowing up the scope probe was palpable.
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, in
the microampere region, since these cathodes are unlit. The Zener diode
therefore may be operating at a much lower voltage than 91V, resulting
in white dots or other unwanted artifacts. Depends on the Zener diode,
of course.
Short answer: B is guaranteed to work, A is try-it-and-see.
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David Forbes
On 7/27/2011 6:26 PM, jerry kimento wrote:
i made a nixie clock using the MM5309 chip
using the BCD out to drive a 74141
my question is ... i cant seem to get the nixies to display very
bright
i did have to play with the c and r values to get it to look readable
but i would like it brighter
and the TTL chip with 5V, and wire the signals
direct. It will work just fine, as TTL is really a 3.3V logic family,
with a 5V power supply.
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A long text, but the main question is: How do I resolve that issue?
The short answer: Don't use PWM next to a radio receiver.
You are introducing an interfering radio signal.
Dim the lights using a variable DC supply with a regulator IC. It will
get warmer, but your radio will work.
--
David
the trouble.
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afford to do that by charging a lot of money for consumer
electronics. A color television cost half as much as a new car in the
mid-1950s.
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money from information.
The text says to type the word Radiola into the little form below, next to a
button that has the word Go.
Once you do that, the form appears.
At least that's what happens in Firefox on XP.
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On 10/14/11 7:23 PM, mike wrote:
dave
do you live in tucson? We live next to U of A my wife is
going after her PHD there
mike
Yes, I do live in Tucson near the U of A, where I work in radio
astronomy. I live behind the Szechuan Omei.
--
David Forbes, Tucson AZ
display with light bulbs.
It might make more sense if you rotated the case counterclockwise 90
degrees to put the seconds on the right and the hours on the left.
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with the supply :)
The boost supply's direct path is not obvious, so don't feel bad about
missing it. It's human nature to consider only the well-considered path
and completely miss the non-obvious path. That's how magicians make
their money.
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Or it could be magic.
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On 11/15/2011 11:24 AM, Larry wrote:
Did anyone notice that his left hand was not visible every time the
pattern changed?
That's magic for you.
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will run hotter,
however. You would want to use one watt resistors for 220V.
By the way, the typical sustaining voltage across the tube when lit is
150V. The difference from your power supply voltage is all dissipated in
the anode resistor.
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For more
for
purchase that fit IN-1s?
The first Google hit for in-1 nixie is Dieter Waechter's clock, which
uses PC board socket pins.
http://www.tube-tester.com/sites/nixie/IN-1_LC-516%20Nixie%20Clock/in-1_lc-516.htm
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David Forbes, Tucson AZ
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common anode driver circuit
to turn off all the anodes.
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David Forbes, Tucson AZ
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for ancient Sprague
driver chips. That's the sort of niche market in which you can name your
price.
I would ask them if it seemed reasonable, but it doesn't seem reasonable.
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David Forbes, Tucson AZ
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On 12/3/11 11:45 AM, Nick wrote:
Subject says it all really - anyone got one I can borrow even?
Thanks
Mocl
Isn't that just a standard 12 pin Compactron socket and a side clip?
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David Forbes, Tucson AZ
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people are planning to do
with displays if they get one. Don't read mine; it's silly.
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David Forbes, Tucson AZ
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On 1/5/2012 10:51 AM, David Forbes wrote:
On 1/5/2012 10:35 AM, coggs wrote:
When I ship my nixie clocks internationally, I do not include a power
adapter.
In North America I get them from Jameco : http://goo.gl/iqTvj 12VDC .
2a 2.1mmx5mm center positive.
Is there a retail store in the UK
often than
once. I will leave them open for now...
Regards
Markus
My friend who used to collect this stuff now calls it all sanitary
landfill material.
You might be able to salvage the nixie sockets.
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David Forbes, Tucson AZ
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on the Nixie tube, because the base has to be
more positive than the emitter, and that's not possible in the circuit
you published.
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David Forbes, Tucson AZ
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purchased from overseas sellers always seems to have
it marked as a gift on the customs forms. So, the question: Is this
standard practice?
-Adam
Yes, it's standard practice. No, it's not strictly legal. No, I don't do
it.
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David Forbes, Tucson AZ
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