Fun with HV

K

Kevin McMurtrie

Guest
Two twisted wires charged with pulsed HV at the threshold of arcing:

http://www.pixelmemory.us/Photos/Nerd/Wire%20Corona/Violet-Corona.jpg


I can't believe that the insulation on this cheap Radio Shack wire
didn't burn through. It was enduring so much ozone and capacitive
losses that it nearly melted during photographing.
 
:eek:)

Beautiful... nice phot too!

"Kevin McMurtrie" <mcmurtri@dslextreme.com> wrote in message
news:mcmurtri-4D46C3.02223415052004@corp-radius.supernews.com...
Two twisted wires charged with pulsed HV at the threshold of arcing:

http://www.pixelmemory.us/Photos/Nerd/Wire%20Corona/Violet-Corona.jpg


I can't believe that the insulation on this cheap Radio Shack wire
didn't burn through. It was enduring so much ozone and capacitive
losses that it nearly melted during photographing.
Click to expand...
 
On Sat, 15 May 2004 02:22:34 -0700, Kevin McMurtrie wrote:

Two twisted wires charged with pulsed HV at the threshold of arcing:

http://www.pixelmemory.us/Photos/Nerd/Wire%20Corona/Violet-Corona.jpg

I can't believe that the insulation on this cheap Radio Shack wire
didn't burn through. It was enduring so much ozone and capacitive
losses that it nearly melted during photographing.
Click to expand...
Thanks foe the wallpaper.
--
Best Regards,
Mike
 
Kevin McMurtrie wrote...
Two twisted wires charged with pulsed HV at the threshold of arcing:
http://www.pixelmemory.us/Photos/Nerd/Wire%20Corona/Violet-Corona.jpg

I can't believe that the insulation on this cheap Radio Shack wire
didn't burn through. It was enduring so much ozone and capacitive
losses that it nearly melted during photographing.
Click to expand...
Did you take that picture? It's damn spectacular! Please tell us
more about how you took it, some of the photographic details, etc.

Thanks,
- Win

(email: use hill_at_rowland-dot-org for now)
 
On Sat, 15 May 2004 02:22:34 -0700, Kevin McMurtrie <mcmurtri@dslextreme.com>
posted this:

Two twisted wires charged with pulsed HV at the threshold of arcing:

http://www.pixelmemory.us/Photos/Nerd/Wire%20Corona/Violet-Corona.jpg


I can't believe that the insulation on this cheap Radio Shack wire
didn't burn through. It was enduring so much ozone and capacitive
losses that it nearly melted during photographing.
Click to expand...
The "pulsed HV" is probably mostly AC. The losses in the insulation
probably held the voltage across the insulation its self down to less than the
breakdown voltage. IOW, there was plenty of current through the insulation but
not much voltage across it.

Jim
 
On a sunny day (Sat, 15 May 2004 02:22:34 -0700) it happened Kevin McMurtrie
<mcmurtri@dslextreme.com> wrote in
<mcmurtri-4D46C3.02223415052004@corp-radius.supernews.com>:

Two twisted wires charged with pulsed HV at the threshold of arcing:

http://www.pixelmemory.us/Photos/Nerd/Wire%20Corona/Violet-Corona.jpg


I can't believe that the insulation on this cheap Radio Shack wire
didn't burn through. It was enduring so much ozone and capacitive
losses that it nearly melted during photographing.
Nice picture!
Click to expand...
 
On Sat, 15 May 2004 11:10:13 +0100, "UncleWobbly" <hendy@talk21.com>
wrote:

:eek:)

Beautiful... nice phot too!
Click to expand...
Yes, very professional.
I wonder why this type of discharge never seems to travel by the
obvious shortest, direct route between electrodes. Anyone know?
--

"What is now proved was once only imagin'd." - William Blake, 1793.
 
Once the air is ionised it will conduct very well, this warm air rises, and
thus leads to the arcs... until the point where they no longer represent the
"best" route, either due to a rise in resistance (shutting the arc down) or
a new arc forming effectively "shorting-out" the more resistive route.

I would imagine the exposure of this photo takes in several of these
"cycles" so we see the rats nest at the top.

This was used as a special in old frankenstein films where the mad
professor's lab had the electrical arcs moving up between two wires that
gradually move apart.

"Paul Burridge" <pb@notthisbit.osiris1.co.uk> wrote in message
news:bueca0hb27i4ude16aqk0eg4rej287gi9g@4ax.com...
On Sat, 15 May 2004 11:10:13 +0100, "UncleWobbly" <hendy@talk21.com
wrote:

:eek:)

Beautiful... nice phot too!

Yes, very professional.
I wonder why this type of discharge never seems to travel by the
obvious shortest, direct route between electrodes. Anyone know?
--

"What is now proved was once only imagin'd." - William Blake, 1793.
Click to expand...
 
On Sat, 15 May 2004 02:22:34 -0700, Kevin McMurtrie <mcmurtri@dslextreme.com>
wrote:

Two twisted wires charged with pulsed HV at the threshold of arcing:

http://www.pixelmemory.us/Photos/Nerd/Wire%20Corona/Violet-Corona.jpg


I can't believe that the insulation on this cheap Radio Shack wire
didn't burn through. It was enduring so much ozone and capacitive
losses that it nearly melted during photographing.
Click to expand...

Kewl, looks like a melting champagne glass...




Remove "HeadFromButt", before replying by email.
 
On Sat, 15 May 2004 17:00:03 +0100, the renowned Paul Burridge
<pb@notthisbit.osiris1.co.uk> wrote:

On Sat, 15 May 2004 11:10:13 +0100, "UncleWobbly" <hendy@talk21.com
wrote:

:eek:)

Beautiful... nice phot too!

Yes, very professional.
I wonder why this type of discharge never seems to travel by the
obvious shortest, direct route between electrodes. Anyone know?
Click to expand...
I suspect the heating in the air causes turbulence which disturbes the
most direct path by moving the ionized air around. That is how Jacob's
Ladders work.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
Kevin McMurtrie wrote:
Two twisted wires charged with pulsed HV at the threshold of arcing:

http://www.pixelmemory.us/Photos/Nerd/Wire%20Corona/Violet-Corona.jpg


I can't believe that the insulation on this cheap Radio Shack wire
didn't burn through. It was enduring so much ozone and capacitive
losses that it nearly melted during photographing.
Click to expand...

Interesting, and lovely photo.

I used to do this when I was a kid, by hooking a 3-6 ft. piece of Radio
Shack clear speaker wire to a Model-T ignition coil that I had rigged to
make a continuous supply of about 15kV, judging from the size of the arc
that it would sustain.

The wire did exactly what we see in your photo, glowing a dim purple
from corona discharge.

I realized it made lots of ozone, so I'd stick it in a mason jar to
collect the ozone.



Good day!


--
_____________________
Christopher R. Carlen
crobc@earthlink.net
Suse 8.1 Linux 2.4.19
 
In article <c855h50268r@drn.newsguy.com>,
Winfield Hill <Winfield_member@newsguy.com> wrote:

Kevin McMurtrie wrote...

Two twisted wires charged with pulsed HV at the threshold of arcing:
http://www.pixelmemory.us/Photos/Nerd/Wire%20Corona/Violet-Corona.jpg

I can't believe that the insulation on this cheap Radio Shack wire
didn't burn through. It was enduring so much ozone and capacitive
losses that it nearly melted during photographing.

Did you take that picture? It's damn spectacular! Please tell us
more about how you took it, some of the photographic details, etc.

Thanks,
- Win

(email: use hill_at_rowland-dot-org for now)
Click to expand...
Thanks!

I took the photo last night. I've made other attempts at this kind of
thing but the insulation usually burns through in a few seconds.

The HV source is two opposite-phased ignition coils driven by two
parallel NTE2385 MOSFETs. The device started out as a "Jar-Jar-Q" joke
but, with some circuit upgrades, became reliable and useful. A pair of
insulated pots adjust the on-time and off-time of the pulsing. For this
photo, the off-time was at minimum and the on-time was set to the
threshold of arcing across the top.

I kid you not - My small tripod tips over when I take profile
orientation photos. The Art of Electronics and a Nesquik carton helped
hold the camera in place.

Other appearances by this device:
http://www.pixelmemory.us/Photos/Work/Women.com/JarJar-Q/
http://www.pixelmemory.us/Photos/Nerd/Propane/


EXIF details from the original photo:

File Name
IMG_1625.JPG
Camera Model Name
Canon EOS DIGITAL REBEL
Shooting Date/Time
05/15/04 01:10:04
Shooting Mode
Manual
Tv(Shutter Speed)
83
Av(Aperture Value)
7.1
Metering Mode
Center-weighted averaging
ISO Speed
100
Lens
18.0 - 55.0mm
Focal Length
25.0mm
Image Size
3072x2048
Image Quality
Fine
Flash
Off
White Balance
Daylight
AF Mode
Manual Focus
Parameters
Contrast Normal
Sharpness +1
Color saturation Normal
Color tone Normal
Color Space
sRGB
File Size
1010KB
Drive Mode
Self-Timer Operation


- Kevin
 
most direct path by moving the ionized air around. That is how Jacob's
Ladders work.
Click to expand...
that's the name I could get... those zzzzzttt zzzzzzzttt thing in old
Frankenstein movies... :eek:)

Thanks!
 
"UncleWobbly" <hendy@talk21.com> wrote in message
news:40a6495f$0$4584$db0fefd9@news.zen.co.uk...
Once the air is ionised it will conduct very well, this warm air rises,
and
thus leads to the arcs... until the point where they no longer represent
the
"best" route, either due to a rise in resistance (shutting the arc down)
or
a new arc forming effectively "shorting-out" the more resistive route.

I would imagine the exposure of this photo takes in several of these
"cycles" so we see the rats nest at the top.

This was used as a special in old frankenstein films where the mad
professor's lab had the electrical arcs moving up between two wires that
gradually move apart.
Click to expand...
I pray to differ - what you're talking about is a "Jacob's Ladder". This
is much prettier. :) The stuff that really turns me on is the corona -
Is that just stressed air ionizing?

In any case, it's gorgeous.

Thanks!
Rich
 
"Kevin McMurtrie" <mcmurtri@dslextreme.com> wrote in message
news:mcmurtri-92897B.12081515052004@corp-
Other appearances by this device:
http://www.pixelmemory.us/Photos/Work/Women.com/JarJar-Q/
Click to expand...
ROFLMAOPIMP!

I didn't know Guy Macon was a Jedi!

Cheers!
Rich
 
On Sun, 16 May 2004 02:40:10 GMT, the renowned "Rich Grise"
<null@example.net> wrote:

"Kevin McMurtrie" <mcmurtri@dslextreme.com> wrote in message
news:mcmurtri-92897B.12081515052004@corp-
Other appearances by this device:
http://www.pixelmemory.us/Photos/Work/Women.com/JarJar-Q/

ROFLMAOPIMP!

I didn't know Guy Macon was a Jedi!
Click to expand...
THAT'S THE ONE! What an irritating POS that "toy" was..

Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
Rich Grise <null@example.net> says...
"Kevin McMurtrie" <mcmurtri@dslextreme.com> wrote

Other appearances by this device:
http://www.pixelmemory.us/Photos/Work/Women.com/JarJar-Q/

ROFLMAOPIMP!

I didn't know Guy Macon was a Jedi!
Click to expand...
I can neither confirm nor deny whether I am a Jedi. Let's just say
that the Sith Order was the victim of bad PR and leave it at that... :)


--
Guy Macon, Electronics Engineer & Project Manager for hire.
Remember Doc Brown from the _Back to the Future_ movies? Do you
have an "impossible" engineering project that only someone like
Doc Brown can solve? My resume is at http://www.guymacon.com/
 
Spehro Pefhany says...
Rich Grise wrote:

Kevin McMurtrie wrote

Other appearances by this device:
http://www.pixelmemory.us/Photos/Work/Women.com/JarJar-Q/

ROFLMAOPIMP!

I didn't know Guy Macon was a Jedi!

THAT'S THE ONE! What an irritating POS that "toy" was..
Click to expand...
NEW YORK--An estimated 80 billion tons of Jar Jar Binks-related
merchandise--manufactured in bulk this spring in anticipation of the
summer's blockbuster Star Wars prequel--is now available at as much as
70 percent off the regular retail price and could plummet even lower
by week's end, according to a report issued Monday by the National
Association of Toy & Novelty Retailers.

"Come on down, one and all, and get your special, ultra-rare
collectibles featuring everybody's favorite bumbling orange space-frog,
the incomparable Jar Jar Binks, surely one of the most enduring and
beloved characters in the entire Star Wars pantheon," NATNR spokesman
Jonathan Oglivie said. "All across America, Jar Jar action figures,
plush dolls, push-up pops, bedspreads, nightlights, play make-up heads,
keychains, toothbrushes, mugs, mouse pads, bicycle helmets, TV-dinner
trays, T-shirts, pajamas, coloring books, paint-by-number sets, jigsaw
puzzles, glow-in-the-dark stickers, videogames, interactive read-along
CD-ROM adventures, and pretty much anything else you can possibly
imagine are available at low, low prices that anyone in the universe can
afford."

Oglivie said the savings are part of a "very special, limited-time
offer" available "only until we can somehow clear all this stuff off
the shelves." He also noted that the estimated 850 billion cubic feet
of cardboard-backed, plastic-wrapped Jar Jar merchandise is available
"wherever virtually anything is sold."

Monday's report comes in response to what industry insiders are calling
"a shelf-space crisis of unimaginable proportions" that has resulted
in "giant piles of Jar Jar detritus as much as several stories high"
in parking lots across the nation. Toy stores, gas stations and
supermarkets everywhere are choked with items bearing the image of the
omnipresent, mischief-making Gungan amphibian.

To deal with the massive overspill of goods, many retailers are offering
a "bucket of Jar Jar" deal, in which customers who bring their own
trashbag can take away "as much Jar Jar crap as they can carry" for a
nominal fee, often one dollar or less.

"Not only is this clearance sale a chance to buy some terrific Star Wars
merchandise at a great price," said Ames, IA, ShopKo manager Benjamin
Reuss, "but it will also help fulfill the legal requirement that I clear
a reasonable pathway to the fire exits before the fire inspector returns
next Thursday."

"Let's face it: America is in the grip of a Jar Jar glut that has
virtually paralyzed the nation," said sales-industry analyst Richard
Januscz. "Almost anywhere you go in this country, there is a life-size
stand-up cardboard cutout of Jar Jar Binks staring at you, extending a
helpful hand toward the soft-drink dispenser, his grinning face seeming
to say, 'Wah-nah so-dah?' He is inescapable. Something must be done
immediately."

A spokesman for Lucasfilm said the enormous discounts represent "a
fantastic opportunity" for Star Wars fans, noting that Jar Jar is a fun,
adorable character who is loved by children of all ages.

"Who doesn't love Jar Jar, with his clumsy, side-splitting antics,
adorable pidgin-English speech patterns, and hilarious Muppety voice?"
asked Lucasfilm vice-president of licensing Joseph Gaer. "As George
Lucas himself has repeatedly stated, the creation of Jar Jar Binks is
his single greatest accomplishment in The Phantom Menace, the aspect of
the film he's most proud of, because Jar Jar is the first completely
digital character ever to appear in a major motion picture. Right?"

"Right?" added Gaer, wiping his brow. "Is anybody with me on this one?
Hello?"

With the Jar Jar crisis mounting, the federal government has stepped
in, urging citizens to "do their part" by purchasing at least one Jar
Jar item. Citizens are also encouraged to stay indoors and use major
business-district thoroughfares only if absolutely necessary.

Should the Jar Jar surplus reach disaster levels, the National Guard
is poised to begin transporting the accumulated products to special
"Emergency Jar Jar Storage Silos" in northern Nevada, where they will
be kept until buyers can be found. If significant tonnage remains
after these measures have been taken, the Jar Jar items will likely be
recycled for use as building materials by Third World nations or, if
necessary, as solid fuel.
 
On Sat, 15 May 2004 11:22:02 -0500, Dave VanHorn wrote:

Thanks foe the wallpaper.
--
Best Regards,
Mike

Me too, beautiful!
Click to expand...
Have you rotated and resized/croped it yet. Did it work out?
--
Best Regards,
Mike
 
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