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 #227
Joined: Mon Feb 20 2006, 10:47PM
Location: Cambridge Ontario, Canada!!
Posts: 127
well guys I have ripped apart my other 2 MOTs and I have 2 cores that are Identical. Can I make a double "E" core? the link for my pictures what will happen if I use both 120 primaries in the same core? I was told I'm gonna over saturate it. as for the wire I'm getting a big roll of 33gauge.
Registered Member #223
Joined: Mon Feb 20 2006, 06:42PM
Location: Ottawa, Ontario, Canada
Posts: 125
Well since you have two identical primaries you could make a nice 1-2KVA isolation transformer. You could use the double 'E' core this would give you even more room for windings/insulation.. If you really want to make your own transformer I would suggest using the double 'E' with the primary in the middle and two new secondaries on ether side using the core as a center tap. However I don't know why you are bent on winding your own.. I mean two mots in series gives 4KV and it's possible to do more..
I wouldn't use both primaries at once since you wouldn't get any gain from it.. If you connect both in series you are decressing the V/turn ratio, so less Vout. And if you parallel them you are gong to cut the primary inductance in half causing double the current drawn from mains.
Registered Member #223
Joined: Mon Feb 20 2006, 06:42PM
Location: Ottawa, Ontario, Canada
Posts: 125
Like that but it would only have one primary and two secondaries.. so it would go secondary-primary-secondary. both secondaries would be connected in series with the center point connected to the core. Or Just have one big secondary and one primary. If you use both primaries in series you are decressing the V/turn ratio; so you get half the Vout for a given Vin.
Registered Member #316
Joined: Mon Mar 13 2006, 01:30PM
Location: Marietta, GA
Posts: 212
Maybe you could use both cores next to each other to make a really wide core and wind your own primary and secondary. With such a large cross-section you could put some serious power through it.
Registered Member #76
Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458
i already wound some high voltage transformers, but never used a mot. the window i too small to get high enough voltages. you have to know that these transformers are very "Hard". they will put some 1000s of watts in short circuit (ie draw an arc) if you use this thin wire then it will burn up within seconds.i dont think its possible
Registered Member #227
Joined: Mon Feb 20 2006, 10:47PM
Location: Cambridge Ontario, Canada!!
Posts: 127
Well I guess no HV transformer, The second thing I wanted to do was to make a large isolation transformer to put in my variac case. maybe I'll make two. Now I have 3 cores ripped apart and I'm getting 2 new MOTs. what guage wire would be right? 20-22?
Registered Member #51
Joined: Thu Feb 09 2006, 04:17AM
Location:
Posts: 263
There is a thread on the old board about an isolation transformer I built out of mots. All I did was cut appart a MOT and replace its secondary with another MOT primary. I dont use the transformer any more though, because it was too big and heavy for my use.
Registered Member #227
Joined: Mon Feb 20 2006, 10:47PM
Location: Cambridge Ontario, Canada!!
Posts: 127
Well, I want to get the most power I can If I build an ISO. So when I rewind It I should: have the same gauge wire for primary and secondary(s), and have the same number of turns for each winding? is this right?
how many turns should I have on each? The 3 primaries I have are all different, one is beat to hell, the other is in great shape and the third is to big for the double "E" core. How many watts can I expect? 1 or 2 Kw?
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.