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.
Hi folks. first sorry for my poor english. i am not good at this. I've looked here so long time cause 4hv didnt send a code to my e-mail. help noob!
in this site,as u see, it used 555 timer and maked L*di/dt big. i callculationed it how much. it's just about "1v" at 1khz. i cant understand what makes 250vdc. i did not make it yet.. but i cant believe.
and.. this one..
in 2nd fig, i think it's capacitor charge boost circuit. looks like use kickbak voltage. i cant understand how it works. somebody please explain this,
Registered Member #1370
Joined: Mon Mar 03 2008, 09:01AM
Location: Finland
Posts: 56
In the first schematic 555 drives a power transistor with square wave. When current is applied, inductor takes some energy. Then the transistor is switched off, and inductor tries to push energy out, which causes comparatively high voltage. Second circuit utilizes inductive kickback too, but it charges two capacitors. Third shows the circuit of shooting coil, caps and thyristors. When you close "fire trigger", L1 shoots it's content out. If "contact exit switch" is some kind of optical switch, whole system could be a two-state coilgun, triggering SCR bank 2 and so shooting contents of L2 out. "Indicator" starts to sink current when the voltage rises. It can be used as a meter for cap voltage, and there it lights a led.
Registered Member #952
Joined: Mon Aug 13 2007, 11:07AM
Location: Finland
Posts: 388
Exactly as Laakkonen said. You might also want to protect the caps from overvoltage, see here for example: So basically there's a comparator which stops the charging when the voltage reaches a wanted level.
BTW, what does anothercoilgunsite have against 4hv? Or do they just want to save their bandwith by disabling linking from 4hv?
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Something went bad a while ago, unfortunately I missed it. He was banned from the forum at any rate, which is probably why he holds a grudge against us.
About my boost converter, it's a poor version made to suit specific components. Namely a TL071 op-amp, which doesn't work well as a comparator. Use Aahz' version instead.
Registered Member #1386
Joined: Tue Mar 11 2008, 08:16AM
Location:
Posts: 13
Uzzors wrote ...
Something went bad a while ago, unfortunately I missed it. He was banned from the forum at any rate, which is probably why he holds a grudge against us.
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.
Coilgun Noob. have Some que
