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.
Hi guys, I'm looking for some small toroid for TC, ideally made from something. But i have no idea where to look. I tried to bend some metal sheet, which went wrong, used covers from floppy stepper motors, which was iron or something, it was decreasing spark length.
Some ideas where to look? Ideally it should be 3-4cm diameter.
On picture with beer can toroid, which is obviously too big.
Registered Member #3026
Joined: Fri Jul 23 2010, 02:46PM
Location: Los Angeles, California, U.S.A.
Posts: 54
Hi Dingo,
For a three to four centimeter toroid you might try a hollow, brass cabinet or door knob. I have used them on small coils. Try Home Depot first, then your average flea market.
Registered Member #1408
Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679
What are they used for / sold as; in a garden center? That's the tiny one? It look larger in perspective with the mounting box. If that is a 4.5" sphere and 2.5" dia. secondary, that's almost a duplicate of my small one! I like the way you did the "antique-furniture" look!
Search for "Gazing ball" on Amazon, eBay, or just Google it.
I've used 12" gazing balls as top electrodes for a couple Van deGraaf generators I built. The ones I got from Amazon were steel and easily cut with a Dremel and a cutoff wheel.
The price of the ball increases non-linearly with the diameter of the ball. The largest and most expensive I've seen is a 22" ball for which was asked roughly $300 US. The 12"er I bought was about $40.
Registered Member #3490
Joined: Wed Dec 08 2010, 11:55PM
Location: The Granite State
Posts: 34
Kinda scary that you ask this question because I was asking myself the same thing yesterday!I actually came up with a pretty cool solution (though availability could be an issue).I simply stacked two of the bells that are used in the old style microwave timers and treated them with a generous layer of JB Weld on the inside to hold them together.The bells all have holes in the center to mount them so there really isnt much to making one of these.Measures 36mm tall by 40mm wide and I should mention that the halves are made of aluminum.Whoops just noticed your size requirements.Worth a try if nothing else pans out.
Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
Another option is using a plastic toroid (childs toy) and coating it with aluminium foil tape. That's what I do with my small coils, but not that small. There should be something out there though.
Registered Member #2899
Joined: Wed Jun 02 2010, 06:31PM
Location: Deinze, Belgium
Posts: 255
quicksilver wrote ...
What are they used for / sold as; in a garden center? That's the tiny one? It look larger in perspective with the mounting box. If that is a 4.5" sphere and 2.5" dia. secondary, that's almost a duplicate of my small one! I like the way you did the "antique-furniture" look!
There are balls ranging from 2-3 inch to more than 10 inch. They float on water. The one on my 'antique' bedside cabinet is =/- 10"
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.
Looking for mini tesla toroid
