If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #564
Joined: Sat Mar 03 2007, 11:21PM
Location:
Posts: 1
I am drawing up plans for a (small) pyrotechnics project for a large event in late summer in the Nevada desert. Essentially I will be floating small bubbles filled with H2O (in gaseous form) up into a grid of HV wires. This will be mobile and battery powered, likely motorcycle 12 or 24 volt. I have not been involved in any HV projects before, but I am quite familiar with precautions from projects running on mains current.
I am looking at a basic flyback design, but I noticed a lot of them are high power enough to sustain an arc. I only want an arc when the bubbles float into the grid.
What I am hoping for is to get an idea of a target kV number in my circuit design and a related gap size between the grid wires to ensure reliable ignitions and minimal shorts. Also, will the use of a high amperage lead-acid battery be a concern as to the final amperage of the HV output? Or does the flyback have internal limitations? Thanks in advance!!
Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
Just about any flyback and any driver with any power source will do.
You position the electrodes so they are just out of arcing range, and I think it's almost guaranteed that if moist bubbles go anywhere near/between the wires (depending on your arrangement of AC/DC) that you'll get an arc and successful ignition.
Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
Methinks it would be problematic without a custom grid and a 'proper' (20kV+) high voltage supply -- if you encounter the issue of the bubble bursting before the circuit is completed through an arc... ignition won't occur..?
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
This sounds like the kind of thing that is best solved by doing a load of fun experiments with different wire spacings and HV sources. I'm surprised you guys even need an excuse to start zapping hydrogen filled bubbles with flybacks. Personally I'd be looking at getting the grid to spray corona from points all over its surface, and hope the corona would ignite the hydrogen even if the bubbles didn't burst in the right places to start arcs.
Is it Burning Man? It would be neat to think that 4hv had a hand in something that gets shown there.
Registered Member #53
Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
Do you mean soap bubbles filled with hydrogen and oxygen or just cloud/bubbles in open air? If it's a soap bubble then pretty much any flyback will ignight the bubble as long as it touches two of the wired, if it is clouds/bubbles in open air I dont know how that woudl be done.
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.
HV Potential across air -- how much to create an arc on contact with solution?
