Main Menu
bullet Home
bullet Forum
bullet Members
bullet Member Map
bullet HvWiki
bullet Chat Room
bullet Submit News
bullet Site Rules
bullet Archives
bullet Visits
bullet Forum
Welcome
Username or Email:

Password:


Missing Code




[ ]
[ ]
Online
  • Guests: 24
  • Members: 0
  • Newest Member: omjtest
  • Most ever online: 396
    Guests: 396, Members: 0 on 12 Jan : 12:51
Members Birthdays:
All today's birthdays', congrats!
Linas (34)
Toasty (29)


Next birthdays
05/16 kg7bz (68)
05/16 steve516 (31)
05/17 Finn Hammer (72)
Contact
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.
Forums
4hv.org :: Forums :: General Science and Electronics
« Previous topic | Next topic »   

[moved] Poor mans Pulse Switch?

1 2 3 
Move Thread LAN_403
uzzors2k
Sat Feb 11 2006, 10:40PM Print
uzzors2k Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
 		Since I can't get a decent SCR for my coil gun anywhere without massive shipping costs, I need to look for alternatives. I've tried various switches, but they have either welded shut, or are just to noisy. My latest idea is to use a flash tube from a camera. To ignite the arc I'll use a pezio, and the cap bank should keep the arc burning. My cap bank is 450v @ 4700µf.

Will this work? And will the small flash tube survive a 500 Joule shot without shattering?
Back to top
Michael W.
Sat Feb 11 2006, 10:59PM
Michael W. Registered Member #50 Joined: Thu Feb 09 2006, 04:07AM
Location: Vernon, B.C, Canada
Posts: 324
 		Hah, I don't know if it will survive but normally theres only about 4 joules flowing throught them....(in a disposable camera)
Back to top
Simon
Sat Feb 11 2006, 11:57PM
Simon Registered Member #32 Joined: Sat Feb 04 2006, 08:58AM
Location: Australia
Posts: 549
 		My bet is on shatter.

If you really want to try, put on the protective gear and do a destructive test - with the camera ready.

I remember Madgyver (is he still around anywhere?) used a flyback or ignition coil or something to for a triggered gap in one of his cap banks.

[Note: moved from EM Projectile board]
Back to top
Wilson
Sun Feb 12 2006, 06:56AM
Wilson Registered Member #78 Joined: Thu Feb 09 2006, 11:27AM
Location: Sydney, Australia
Posts: 133
 		I doubt whether a flash tube from a disposable camera would work. It would probably be a single shot device, with the tube too cracked to fire again, or it just explodes :P
btw, have you considered using a large circuit breaker- like the industrial 6kVA surge types?
Back to top
Bjørn
Sun Feb 12 2006, 07:22AM
Bjørn Registered Member #27 Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
And will the small flash tube survive a 500 Joule shot without shattering?
I cracked one with 60 Joule so it is not going to work at all.
Back to top
uzzors2k
Sun Feb 12 2006, 10:16AM
uzzors2k Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
 		What about a large sealed spark gap? I think I saw like that at Link2 once. Otherwise I guess I'm going have to buy a SCR...
Back to top
ragnar
Sun Feb 12 2006, 12:52PM
ragnar Registered Member #63 Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
 		I'll tell you now it's unadvisable.

http://www.whiteplasma.com/matt/imagedump/deadxenon1.jpg
http://www.whiteplasma.com/matt/imagedump/deadxenon1.jpg

Wear safety goggles and get it on video! :D
Back to top
Marko
Sun Feb 12 2006, 01:22PM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
 		I have similar problem for my 600 joule bank.
SCR seems only good solution, or simplest posible mechanical solutions (like tesladownunder's rope-switch) that you won't be sorry for if they weld..

Small flaashlamps may be just fun blowing up.. cheesey
Back to top
EDY19
Sun Feb 12 2006, 05:45PM
EDY19 Registered Member #105 Joined: Thu Feb 09 2006, 08:54PM
Location:
Posts: 408
 		Just go for a SCR- I got a 2kA peak current 1200V SCR for 10.00 shipped. It works great, and if it ever fails, I have the other half of it, it is a dual unit.
Back to top
uzzors2k
Sun Feb 12 2006, 07:44PM
uzzors2k Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
 		Nice buy, where did you gt it?
Back to top
1 2 3 

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob

Go to:

Powered by e107 Forum System
 
Legal Information
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.