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 #2046
Joined: Sun Mar 22 2009, 01:12PM
Location: Stockholm, Sweden
Posts: 23
The coilgun itself starting to come together, ended up with 2x 3300µF 350V capacitors, so a total of 404J @ 350V, the static charger(previous posts) only charges to ~322 volts though. Will see what the mobile charger does once I make it :P..
Registered Member #2046
Joined: Sun Mar 22 2009, 01:12PM
Location: Stockholm, Sweden
Posts: 23
Alright then, another slow update coming up!
I've hooked up the first capacitor to both firing and charging system, as you can see the construction is getting sloppier since I'm quite tired of this coilgun already, I'll just finish it to learn more about optogate triggering which is the next step. The DC plug is for the external charger, which can be controlled by the C0/C1 switch, B1/B0 controls shuts off/on the onboard battery power stored further back in the stock.
So far the performance is promising, 20m/s from 320V 3300µF, which should equal around 6.6% efficiency with the 56gram projectile. Hopefully I'll get >30m/s with second stage.
Registered Member #2046
Joined: Sun Mar 22 2009, 01:12PM
Location: Stockholm, Sweden
Posts: 23
Well this is just getting messy and doesn't seem to spark much interest. It's all so unplanned from the start that it's getting hard to get things together in a good way..
I'm already planning my next coilgun so .. Few more stages, smaller projectile, different layout, and so on.
Registered Member #2046
Joined: Sun Mar 22 2009, 01:12PM
Location: Stockholm, Sweden
Posts: 23
Worked a bit on the trigger schematics.
Slightly worried about the second stage going on due to electrical noise or something.. I were originally planning to use a 7404 for inverting the signal from the photogate but I reasoned that using this I'd skip the entire voltage-regulator history for the IC and thus reduce some hazzle..
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.
Work in progress ~350J 2stage coilgun
