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 #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
hen918 wrote ...
It's a bit scary that the HT lead does not insulate the high voltage! You would have thought they would have used tick enough insulation.
This can happen with any flyback when it's abused. One of the reasons why 'chicken sticks' are MANDATORY. Even in a CRT the HT lead has a plastic 'spacer' thingie to keep the lead away from grounded parts.
It shouldn't be too difficult to add extra insulation, but I'd still keep my distance.
I'm more concerned about internal breakdown, what with a 'theoretical' DC breakdown voltage of 83kV.
At least none of these have failed yet, but I'll probably destroy mine eventually, and cut it open to see exactly what's inside.
If you have concerns, run it under oil, with heavier insulated leads from the oil container to the arc, or other load.
Registered Member #6541
Joined: Sun Sept 09 2012, 05:01AM
Location: Melbourne Australia
Posts: 16
I don't have a link or data sheet for the smpsu, I found a box of them dumped on the side of the road with a heap of wire and downlights. The unit is an "Electronic transformer for Halogen lamps dimable (trailing edge) and the stats on the unit are Pri 220 - 240v 50hz 0.25a pf>0.99 Sec12vac 20-60va max . Ta:0-40 deg c Tc 80 deg c.
and the guts of it:
I was surprised at the arcing over in the flyback, not only from the bolt to the cable in the video but also from the secondary to the frame (not captured on film) when I streched the arc to its maxium. I put 10 winds on the primary, should I alter that?
I like the arc this makes better than the zvs (for my plasma tube project) ... we'll see
Registered Member #8817
Joined: Mon Dec 17 2012, 05:16AM
Location: Australia
Posts: 110
hen918 wrote ...
It's a bit scary that the HT lead does not insulate the high voltage! You would have thought they would have used tick enough insulation.
The leads are quite thick as they are, look at the volts coming out of the transformer, its really hard to insulate against that voltage when its really close or touching the core.
Registered Member #8817
Joined: Mon Dec 17 2012, 05:16AM
Location: Australia
Posts: 110
Hey guys i have one flyback left, it has a tiny bit of damage, one of the core supports has broken off, this certainly doesn't have any detrimental effects on the performance of the flyback, it actually allows the flyback core to swing 90 degree's to one side to be more compact.
See photos:
Anyway ill left it go for $45USD + postage, first in best dressed.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
One of mine had some superficial damage on the bobbin as well, for some reason I have found shipping to/from australia to be by far the worst in terms of the packages being damaged. I ran a group buy ages ago and a sizable fraction of the packages arrived empty--the package had been torn open and all that arrived was the label!
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.
Modern AC Flyback Transformers
