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 #1258
Joined: Wed Jan 23 2008, 11:52AM
Location: Haarlem, Netherlands
Posts: 20
hi all, i'm planning on building a sgtc for a schoolproject and i've did some research and made some calculations but i've ran into a few problems. i've got two neoncomp NST's:
and i was wondering if i can put them in parralel to create 8+6.3=14.3kV. i know that it is possible with most transformers but since mine have two live outputs instead of one i didn't know how to connect them. is there anyone who has tried this before and can give me some tips? or is it just not possible? greetz Phoenix
Registered Member #1198
Joined: Sat Dec 29 2007, 05:39AM
Location: Seattle, WA
Posts: 21
You parallel transformers to increase current not voltage. If you want to increase the voltage you need to connect your transformers in series. However, putting NSTs in series is not generally a good idea because you will likely exceed the voltage rating of the secondary and burn out your transformers.
Just using the 8kV NST should be fine for a small demo coil anyway.
Registered Member #1103
Joined: Mon Nov 05 2007, 06:02PM
Location: Houston
Posts: 80
If this is for a school project I would be very weary about buliding something even moderately large. I would forget the idea of using NST as they are too large and bulky for this specific application.
Choose something like a small flyback power supply using the ZVS driver. This topology should provide you with more than enough energy to run and demonstrate a tesla coil for a school project.
Ultra7, you live in Houston too? How strange! Do you ever visit EPO?
Registered Member #1258
Joined: Wed Jan 23 2008, 11:52AM
Location: Haarlem, Netherlands
Posts: 20
@ dalus: what is the difference between a switched mode and a regular nst? the ones i have are the ones this guy refers to on the 05:40 mark as "m-point" transformers.
@ ultra7: so what you're saying in the link you gave me is that i can put them in parallel but i would have to find the right phases by trial and error? wouldn't it be a problem that they have different voltage ratings? if i put them in parallel that should give like: (6300+8000)/2 = 7150V @ 2*50=100mA right? would doubling the amperage improve the functioning of my coil?
btw i have recently built a jacob's ladder because i had these transformers laying around and i couldn't wait to test them :P i'm kind of looking around to see if there's any fun stuff i can do with a jacobs ladder. i saw pics of a guy who built one in a glass tube and filed it with lightergas but that's too dangerous for me :P i was more thinking about creating different colours of spark or something. i also built a bottle capacitor from 3 glass 30cL beerbottles, some saltwater and some alufoil. i tested it and it worked quite allright but i have to get a better multimeter somewhere to measure the capacitance. is there a formula to calculate capacitance based on input voltage/amperage and dielectric?
Registered Member #1157
Joined: Thu Dec 06 2007, 12:11PM
Location: Houston, TX
Posts: 307
SilentPhoenix wrote ...
@ ultra7: so what you're saying in the link you gave me is that i can put them in parallel but i would have to find the right phases by trial and error? wouldn't it be a problem that they have different voltage ratings? if i put them in parallel that should give like: (6300+8000)/2 = 7150V @ 2*50=100mA right? would doubling the amperage improve the functioning of my coil?
btw i have recently built a jacob's ladder because i had these transformers laying around and i couldn't wait to test them :P i'm kind of looking around to see if there's any fun stuff i can do with a jacobs ladder. i saw pics of a guy who built one in a glass tube and filed it with lightergas but that's too dangerous for me :P i was more thinking about creating different colours of spark or something. i also built a bottle capacitor from 3 glass 30cL beerbottles, some saltwater and some alufoil. i tested it and it worked quite allright but i have to get a better multimeter somewhere to measure the capacitance. is there a formula to calculate capacitance based on input voltage/amperage and dielectric?
greetz
Exactly!!! More current = Bigger sparx!
Do you have Teslamap yet?
If not it's a free download at , and you can play with all your numbers on it and see what differet current/voltage values will do to your output. Also it will give you accurate tuning points, LTR Cap values. . . you get the drift.
Oh, and I was just like you when I got the NST, I built about 3 Jacobs ladders' and did all kinds of arc and spark experiments. I could not contain my desire to build my coil. When all my parts were together and I began final construction, it was like the buildup to that final date with the woman of your dreams and she orders the lobster dinner.
Registered Member #1103
Joined: Mon Nov 05 2007, 06:02PM
Location: Houston
Posts: 80
wrote ... More current = Bigger sparx!
I wouldn't say this is always true. Input voltage also plays a big role in spark evolution and length. Generally speaking, more current only intensifies arcs.
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.
building my first sgtc
