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 #39190
Joined: Sat Oct 26 2013, 09:15AM
Location: Boise National Forest
Posts: 65
I think Patrick is asking how close do you have to bring the terminals for the initial arc to start. That is an approximate measure of voltage. Once an arc has started, the hot ionized air is much more conductive, which is what allows you to move the terminals apart.
7cm would be a crazy long distance for a LOPT to strike an arc. 1cm would be more typical.
Had a bit better luck since the first try running the same coil with the same LOPT, but replaced my homemade foil cap with this:
It should be 35kV 2000pF, but that’s an arbitrary value. I’ll have to find what’s ideal the hard way, adding or removing strings of five capacitors.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Art, if you don't know of it, the Spanish firm HR Diemen is a great source of LOPT datasheets. The trick is to identify the model number on your LOPT amongst all the different numbers often printed all over them. Heaven knows what all these numbers are.
HR Diemen make replacement LOPTs so there are 'HR Diemen equivalents' for most current and slightly dated TV LOPTs and a lot can be learned from their data sheets. Pin configurations, output voltage and current, auto-transformer taps, diode splits, and all the secondaries used to provide HT to sub-systems around the tele: the more work they can get out of an LOPT, the more the designers like it.
Here is HR Diemen:
PS: You did a good bit of work soldering those capacitors.
I’ve got some high hopes because I had good success today with a lot of things I know are off. The primary is insulated at the moment so I can only tuned in steps with some taps I’ve made. Also, the capacitor value is arbitrary. I could still have to add or remove caps to find an ideal value. But having said that it’s the first night I got streamers to break out into the air from a torus, so I’m pretty stoked.
Here is six seconds.. It’s still pretty noisy to do late at night!!
The leads probably should be at the midpoint yes. This isn’t copper, I had brass rod already, but I figured brass is close enough. Thanks, I will see if mine can be identified. I have the second one for spare now.
Thanks :) At risk to my phone here’s a better one: I think to get a single longer streamer I’d be wanting to put a pointed wire back on it. It seems to want to break out in a lot of places at once so energy is distributed amongst lots of points.
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 Former Questions
