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 #2998
Joined: Tue Jul 13 2010, 08:34PM
Location: Swedish forests.
Posts: 26
I've made my own secondary to good effect. I used high quality copper wire from a MOT and might have reached about 400 turns at most. The turns ratio definately isn't the issue, bus as other members have pointed out it's insulation.
I use regular clear plastic tape about 5 layers per layer of coil, and wind them from the top to bottom with a single strand going up again when I reach the bottom. This way the voltage is evenly distributed throughout the coil, and doesen't spike at the ends. Just remember to insulate this runner strand some extra, or else the effort will be in vane.
I've never used oil or the like to secure the coils, I just wrap them very hard with tape, first regular, then electrical. And of course I try to wind them as hard as I dare without snapping the wire so there's very little air in them.
I wind my coils a little smaller each layer not so much for capacitance problems, but to give some clearence to the core as the voltage increases. At 15Kv (estimated) the core is surprisingly conductive, as I had the misfortune of finding out in my first attempt.
Another thing that's beneficial with winding your own scondaries is that you can vary and/or eliminate the airgap in them. I found that my low freq ZVS circuit worked much more in harmony with the core without the airgap. Not any higher voltage, but DAMN the sparks became hot!
Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
what is an air gap?
I use one strip of red paging tape for each layer and then put it in oil i have a rig setup so i can wind it on a drill, so winding is easy. I am trying to get the right mix of voltage and current but i might get some 30 gage wire and wind that for some really high voltage.
Registered Member #1875
Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
From what I've read, the gap can be anywhere in the ferrite, even distributed throughout the core. Having two plain old equal size U cores with a spacer is just the easiest thing to do, I suppose, which results in two gaps.
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.
winding a secondary on a flyback core
