Back when the neighborhood use to throw 4th-of-July block parties,
we'd just plop a keg of beer at each end of the street, and a crowd
would form in short order.
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On Jan 19, 1:55 am, lai...@wcoil.com wrote:
> 3 years in
> the Engineering Test Lab I can pass on a little information on alternator
> speeds. On a sychronous alternator the rotor operates with DC excitation, ...
> Tim
I remember we had a synchronous machine in our university's power lab.
Th
Interesting.
Yes the grid frequency drops when the generating station is
overloaded, the gensets slow down and the output frequency depends on
ratational speed, theres an online gizmo for the uk that shows the
current frequency, it says at the lower end 'overloaded'.
This side of the pond you can g
My battery just died over the last week. :(
Bunny provides free batteries, right? :)
Michail
In a message dated 1/19/2012 12:34:20 P.M. Pacific Standard Time,
n...@desmith.net writes:
No - perhaps people with Nixie Watches can post photos of them? I
still have my pre-production pro
On Jan 19, 6:03 pm, David Forbes wrote:
> This group will be 10 years old on the 27th of this month. That's only a
> week!
Well, its just over 2 years since I opened this new version to
original members (16th Jan 2010) - I actually started the Google
group in August 2004, but it was very lonely!
Here is the modification for 50Hz:
http://www.tayloredge.com/storefront/1384_TIClock/1384_60-to-50Hz_Conversion.pdf
Note that there are some errors in the original schematic, cleaned up
schematic here: http://www.tayloredge.com/storefront/1384_TIClock/1384.pdf
jt
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This group will be 10 years old on the 27th of this month. That's only a
week!
Does anyone have any plans for a Nixie tube-themed party?
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David Forbes, Tucson AZ
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Hi folks,
I have two new F9090AA Nixie tubes for sale, just like this one:
http://www.jb-electronics.de/html/elektronik/nixies/n_f9090aa.htm?lang=en
Anyone who is interested: please feel free to contact me.
Best regards,
Jens
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Hello Tim,
What fond memories this brought back. Many years ago a good friend
of mine who worked for the electric company took me into a small
unmanned powerhouse, and let me bring up the D.C. exciter first, and
then one of the fairly good sized alternators. With lots of instruction
he the
In my past life at an operating nuclear power plant when we brought
the unit back on the grid we still used the synchroscope method...no
flashing bulbs just a nice analog meter that indicated the generator
was in phase. Then manually closing the main breakers and hopefully
everything worked well.
> > have a Nixie clock based on that (uses mains frequency), and I can
> > tell you that it is not true at my outlets! The clock loses a few
> > minutes every day, which makes it more of a lamp then a clock.
>
> I suspect that's more a problem with the clock than the power frequency. To
> extr
Tim,
Thanks for that. Long read, but worth it.
makes people realize a little more than a lot of work is involved.
I do wonder how much of that is now automated.
Michail
In a message dated 1/19/2012 1:54:38 A.M. Pacific Standard Time,
lai...@wcoil.com writes:
Tim
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You received th
> I have heard the same thing about the US grid having the exact number
> of cycles per day, due to legacy use of the frequency for clocks. I
> have a Nixie clock based on that (uses mains frequency), and I can
> tell you that it is not true at my outlets! The clock loses a few
> minutes every da
> I was thinking to use the level shifter on an H-bridge (4 transistor
> array [2 NPN and 2 PNP] that reverses polarity) to power NE-2s. While
> there are tricks to make one NE-2 light both electrodes, powering many
> requires a lot of components.
[...]
> Many NE-2s (with both electrodes lit) can
I have heard the same thing about the US grid having the exact number
of cycles per day, due to legacy use of the frequency for clocks. I
have a Nixie clock based on that (uses mains frequency), and I can
tell you that it is not true at my outlets! The clock loses a few
minutes every day, which m
Thanks guys!
@David - In retrospect,common anode would have been nice, but they are
what they are. They have such a neat color that I have never seen on
an LED, I don't want to give them up! They make a really amazing glow
on IN-18s.
@John and dr pepper - that all makes more sense now, thanks.
Thanks Tim, a bit off topic but very interesting!! I find stuff like this
quite fascinating. I like how if you are a little off on your timing the
motors would ring like bells as they jerk into synchronization. Definitely
a good read for this morning.
Thanks,
Joe
On Thu, Jan 19, 2012 at 3:55 A
> When I connect the emitter to to +13v, base to ground or +5 through
> any resistor and collector to the array, it lights up. Only when I
> disconnected the resistor (open), does the array turn off.
Right. You'd have to pull the base to +13V to turn it off. Something lower
(more negative) tha
My source for this isnt necessarily accurate, however they say the
mains freq is accurate in the uk over a 24 hour period from 9 am till
9 am, they speed up and slow down the gensets during the 24 hours and
at night time they control the speed to get the right amount of cycles
for the last 24 hours
Having worked at Lima Electric (Sadly No longer in Lima Ohio, Factory
Closed) for over 5 years making synchronous alternators, and 3 years in
the Engineering Test Lab I can pass on a little information on alternator
speeds. On a sychronous alternator the rotor operates with DC excitation,
either s
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