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 #2555
Joined: Sat Dec 19 2009, 05:58AM
Location: GRAND JUNCTION, CO U.S.A.
Posts: 1
I am new to the business of using flyback transformers to generate high voltage and I need some advice.
What are some especially good flyback transformers to use for generating long discharges? Eventually, I plan to build a small Jacob's Ladder but initially I just want to experiment with flybacks, learn their characteristics, and build several different kinds of flyback drivers.
Should I look for the old type of flyback without built-in diodes or should I go with those newer types that have diodes? Does anyone in 4HV.ORG sell them or should I go to EBAY?
Can anyone recommend an especially good flyback driver circuit?
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
The older style bare-wire transformers will usually put out more power before overheating, however the modern diode split ones will produce more voltage before breaking down.
If you want a lot of power, you can rewind the transformer with a thicker wire - the cores from older transformers are quite large and will allow a winding with much less resistance than the original one (if you do it right), you can even put put it under oil for better heat transfer and insulation.
I've wound up some large flybacks based on the old Zenith large tube TV set design. I've added 400 more turns for a total of 4,200 turns on the sec. Pri is a standard tapped pri that is driven with a transistor type driver. I have the circuit ---- you may contact me off-list if you need it. **link**
This flyback also works well with the NEC voltage tripler if you are charging DC Marx circuits, etc.
Registered Member #2316
Joined: Tue Aug 25 2009, 03:04AM
Location: Bendigo, Australia
Posts: 107
If you want driver plans, we won't spoonfeed but I recommend you search for the "Improved single transistor flyback driver" on the search bar on the right of the 4hv logo.
Registered Member #1104
Joined: Tue Nov 06 2007, 07:38PM
Location: Wisconsin, United States
Posts: 34
Zeus wrote ...
... I recommend you search for the "Improved single transistor flyback driver" on the search bar on the right of the 4hv logo.
I would also recommend this driver as a first time, alternately you could also start with a 555 based driver which would also give you a crude way to audio modulate the flyback (using pin 5). If it’s a jacobs ladder you’re going to build, then the Mazzilli ZVS flyback driver would be the one that can push insane amounts of power through the flyback (possibly lethal amounts). Uzzors website can be helpful when picking a driver topology.
As for the type of flyback, an older type would be best because then you have less chance of getting one with an internal capacitor which would make it useless for what you want to do with it.
Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
The easiest driver by far is the electronic halogen light transformer. You just connect the flyback primary to the 12v output and away you go! This does rob you of some valuable knowledge gained by building your own driver, so if this is your first time I would suggest building something such as the single transistor type. The Mazzilli driver seems to be pretty dangerous for a new guy. Matt
Registered Member #491
Joined: Thu Nov 09 2006, 02:03AM
Location: S. California
Posts: 5
There's two resonance research ones going on ebay right now - they make 15kV or so, or 30kV under oil. They are the open frame type, great for high voltage.
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.
FLYBACK TRANSFORMERS HELP NEEDED
