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 #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
As a part of my ongoing endavour to produce insanely high voltages I put this thing together last night:
It's a 9 stage CW consisting of 1nF 10kV capacitors and 15kV diodes, with all the conections covered up with brass spheres. I hope that this will limit conrona enough so I can run it in air. Not tested yet for lack of a suitable high voltage source - a flyback is going to produce much more than 7kV rms and therefore will immediately blow the capacitors. I think I'll also want more current than a flyback can reasonably supply, so I'll probably wind my own transformer for this. If only I could get my halfbridge or ZVS driver to work.
Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
good point Sulaiman, thi would just save me time winding the transformer. I suspect I might be better of redoing the wohe thing for 30kV per stage though, I think efficiency is going to suck with so many stages.
A MOT is going to be no good for this, at 50Hz I might be able to put 800mW through the CW if I am lucky, but not the 800W the MOT is rated for.
EDIT: I got the thing working now, I am using a single-layer secodary on a flyback core, driven by the ZVS circuit. I get more than 5cm arcs out, which I think is pretty much the maximum I will ever get from this. Now I just need to put more power through this, so I can use it to charge up my Marx gen.
Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
One month later... Cut down to three stages rated at 30kV each, this provides for a much better throughput of power. Driving with a flyback of 10kV rms or so, it produces an estimated 2*3*1.4*10kV= 80kV.
I had to increase the space between the components as I had corona actually kill on of mz capacitors. The red thing, btw, is a water resistor to protect the diodes.
Pictures:
Overhead sheet placed on the topload (negative polarity) and grounded wire near it. Surface tracking distance is a total of more than 20cm back and forth.
Another shot, two second exposure:
new OHP sheet, after the first one got punctured. Still I am impressed how much voltage they can stand.
Oh, and a funny side node: After I had switched the generator off and discharged all the capacitors, I picked up the OHP sheet because I wanted to see if it was still charged. It was! A bright, nested flash extended something like 10cm around my thumb and index finger, and discharged the surface charge with a painfull snap. Wow! Even after that, the sheet had still enough charge that when I placed aluminium foils on both sides, they were charged up to several kV and I could discharge them with a small bang. Fun!
Registered Member #53
Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
Unexpected capacitors can be fun and VERY painful dicoveries. I had the glass of a 60w light bulb charge up enough that my arm tiwtched when it discharged into my thumb.
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.