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 #1430
Joined: Sun Apr 06 2008, 11:12AM
Location: Ã…rhus, Denmark
Posts: 102
so, i finally got around to building that awesome spudgun i have been wanting for so long. chamber fan, pure butane fuel meter, laser sight, firing timer, microcontroller based chronograph mounted on the barrel? all that kind of stuff. the problem is: i need a small ignition circuit! ignition coils and flybacks are simply too big.
i'm planning on using a 13cm * 7cm * 4cm box with 2 9volt batteries for the chamber fan as the housing.
do you have any ideas on small circuits that will give off some nice at hot sparks/arcs that will fit in the box?
Registered Member #1221
Joined: Wed Jan 09 2008, 06:17PM
Location: Odense, Denmark
Posts: 196
Modified camera flash circuit to discharge some capacitor into the chamber? Not super high voltage I supose but a discharge like that ought to ignite the gas, right?
Hurts alot on your fingers at least.. been zapped once, never really got back to that circuit again :D
Registered Member #1430
Joined: Sun Apr 06 2008, 11:12AM
Location: Ã…rhus, Denmark
Posts: 102
by "discharging some capacitor into the chamber" i assume you mean the method with the really really closely spaced electrods, i have tried that before, but the electrodes are extremely sensitive. after about 5 shots, the electrodes need adjustment again and the charging time sucks
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Discharge a somewhat small capacitor into a little pulse coil?
I have used a normal magneto from a weed wacker for a pulse coil. I wound a primary on some random part of the iron core, and discharge a small capacitor into it and it gave a couple inch spark. They are usually pretty small, and the charging circuit could be a camera charger, and try like 10uf or something. That would charge quick and probably be enough for half an inch spark.
That is what i would do. Just look for a trashed weed wacker.
Registered Member #396
Joined: Wed Apr 19 2006, 12:55AM
Location: Pittsburgh, PA
Posts: 176
I've used a small 9v battery powered grill ignitor very sucessfully. It came with a big cool looking red button and gives out successive pulses of probably 8kv at about 4 Hz for as long as you push the button. It definitely meets your size requirements too. I think I got it on eBay. A quick search returned this - which is similar but you could probably find it cheaper if you look around.
Registered Member #2261
Joined: Mon Aug 03 2009, 01:19AM
Location: London, UK
Posts: 581
If you just need a spark to ignite a gas air mix from a finger operated trigger, you couldn't get much better than the mechanism out of a piezo type lighter.
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.
tiny ignition circuit
