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 #639
Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512
Wouldn't agree Linas coil is about the same size as mine and I was eventually able to break 2.4 meters running with a 10A variac. Tank cap size doesn't matter much just make sure it's tuned and have a high coupling factor between te coils.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Dalus wrote ...
Wouldn't agree Linas coil is about the same size as mine and I was eventually able to break 2.4 meters running with a 10A variac. Tank cap size doesn't matter much just make sure it's tuned and have a high coupling factor between te coils.
Yea, it is all about the limiting factors like tank circuit impedance. Of course, more capacitance means you can use even less primary turns, which means less resistance . It all depends on the primary resistance. Coils with higher freq can run a tiny tank cap, but still use few primary turns, and the current would still be the same (provided primary impedance is the same). As long as the tank cap is resonant, which in a primary current feedback drsstc, it always will be, the current will be high. I am just repeating myself now.
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
OK, i added one string to MMC, also used more turns,and in large room i was able brake 2.4m limit :) soon i will upload some videos, but not all the sparks you will see in video, so now now waiting for HD night vision cam :)
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Still,i have just 5V on current protection ( just in ground sparks can create 8V 1000:1 4,7R ) so maybe larger MMC ? Yes, now 3m :D But first, big show for physicist day
Registered Member #639
Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512
Yikes watch out for your secondary with all those racing sparks. Might be wise to reduce coupling a bit if you want to push it further. Awesome display of power, well done Seeing your coil makes me want to rebuild my own again with a proper MMC and a larger variac . . .
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
i just need new secondary with good varnish that's it and those racing sparks are because of polishing failure and wet surface closer video Coil was in small room, so i have just 3m safety are, so during this video, when spark expand you can see that people who capture this video started to be afraid
Dalus wrote ...
Seeing your coil makes me want to rebuild my own again with a proper MMC and a larger variac . . .
The same thing happened to me, then i so Finn Hammer DRSSTC powered from 800V ups, I forgot to mention that when somebody remove ground in test, i blow one BS170 transistor in delay circuit, so my coil was running just with two transistors , so i get just half power output ( like 1m sparks ) IGBT handle it very good ( maybe because i have all protection which can be used in IGBT drivers )
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.
Large DRSSTC [update]
. It all depends on the primary resistance. Coils with higher freq can run a tiny tank cap, but still use few primary turns, and the current would still be the same (provided primary impedance is the same). As long as the tank cap is resonant, which in a primary current feedback drsstc, it always will be, the current will be high. I am just repeating myself now.
and a larger variac . . .
