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 #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Killa-X wrote ...
Awhile ago I made a snubber circuit for my flyback to help prevent spikes and stuff. I learned 2 things with it.
1: With correct hookup, I get thin arcs, but i can go as long as 5 inch (75V) with a flyback. Multi-stringed 5 inch arc. 2: If reversed, I get THICK ZVS-like arcs from 1 inch (20V) to 3 near 4 inch (75V) Shorter, but THICK and white.
I found that my mosfet never got warm, even without the snubber. However the snubbers resistor gets extreamly hot if its not sinked. I use to have a diode on the resistor, until i found its under-rated. 1000V 1A 1n4001. Poor thing smoked a tad. Put a 1000V 6A on it, nope, still did. So i cut that all out.
as you might have noticed, theres some redish crap all over the cap and the side of the resistor..My first Varistor, well, It kinda had a little issue, super smoke bomb. SO. I cut the varistor off my 120V switch I hacked off a old radio, and well, Doesn't even get warm :) She works! You can also see a 4001 hiding under the resistor :D Too bad its not connected due to overheating.
Umm, that diode was supposed to be uf4007! It has to be ultrafast, otherwise it will stick halfway on and be linear and heat. Needs to be high voltage, too. The spikes are likely pretty high.
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
I decided to post my pics here because I'm not fully done, and it will be a delayed project until my older brother moves up to Michigan this weekend. Once I get more going, I'll post a thread for a project. For now, here.
Pic 1: With a flash, you can tell I used 2 different spools. I can't buy stuff because of my brother moving, so I'm making things with what I have, many transformers. The transformer covered 6.25 inches of a 2 inch PVC pipe. Then I had extra from a previous one, and finished it to 10 inches. NOTE:It's NOT done. I have to varnish it, trim the bottom to balance it, and cut the top off. Right now I'm adding 2 knex wheels at the ends for a motor shaft to spin while i varnish it. Then i will cut 3 inches off the top.
Pic2: No flash Pic3: Possible topload maybe. Not sure.
Registered Member #1535
Joined: Wed Jun 11 2008, 11:37PM
Location: Northeastern Pennsylvania - USA
Posts: 117
I assembled a very odd arrangement with my 1st DRSSTC. I thought it was kinda interesting to see a 42 inch arc coming from a 2 inch by 8 inch toroid...
Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
Seems that it blocks those to prevent from using it as a image hosting site. Both are on this page:
The second image is not very good. I mounted the lens and laser, so it stays better. I will get a better picture tonight. The camera also doesn't capture much, just the brightest spots.
Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: Pacific Northwest USA
Posts: 1042
some new items in my Chemical Collection (and I have two more, VERY special Element samples coming in the next few days... bu they are from out of the country so I don't know when exactly I am going to get them...) - anyone willing to guess what elements I am getting samples of?
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.