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 #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
So try as I might I cannot get 6.5kV out of that AC fbt at 85khz. The core saturates before I can even get 700V out of the thing.
I decided to make an AC FBT using a modern core, this one from a projection TV. I have only 24 and 40ga magnet wire and 24 seemed too thick. 40 is a little thin but it's not as thin as typical FBT wire so I figured it'd work.
Halfway through the first layer I thought, wouldn't it be neat if I could get 75kV directly out of the thing? So that's what I'm planning to do, make a flyback-xray transformer.
So I plan on putting all my 40ga wire on there (~1/4lb), a daunting task to say the least. I managed to get the first layer done (~250 turns), but I'm not sure what I should use to insulate it. This transformer must be submerged in oil and a vacuum pulled for it to work (refrigerator compressor) and if I use plastic I fear that it'll prevent the mineral oil from insulating things (non permeable).
So what should I use 4HV? 3 turns of paper possibly?
Registered Member #3343
Joined: Thu Oct 21 2010, 04:06PM
Location: Toronto
Posts: 311
Ya.. It is difficult to figure out what u are going to do. Let me know: How many turns @ primary?? What is the primary voltage ?? How many volts per turn?? kind of pulse, pulse lenght microseconds? ferrite cross section?
The first secondary layer has 250 turns ?? How many turns the secondary second layer ?
Maximun interlayer volts ? Thicknes of paper ? Dielectric strenght of paper. Secondary capacitance ?
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
I don't think it will. Plan C is to wind a regular AC flyback on a computer monitor core (150khz) and use a multiplier with that.
But for those who have made their own flybacks and or know something about HV transformer design, what should I use between layers, if those layers are to be oil saturated?
Registered Member #3282
Joined: Wed Oct 06 2010, 05:01PM
Location:
Posts: 224
maybe you would get better results if you wind like this? Each island of wire has a higher potential than the next island of wire. thus you wcould use paraffin as a potting compound.
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Hmm I see what you are saying, but the thing is I am not a machine capable of stacking wire into those fancy little pancakes one sees on old flyback transformers.
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.
Tasks such as this should not be attempted by man.
