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 #3768
Joined: Tue Mar 22 2011, 12:46AM
Location:
Posts: 107
Can anyone give me proper instructions on how I should do this? Like how did I tune my primary coil, My secondary coil is this one, which apparently resonate frequency is approx 211 kHz "Resonate frequency is approx 211 kHz. If you make a primary from 0.25 inch coppper tubing with 0.25 inch spacing and a 9.3 nf capacitor you will be in tune at about turn 9 or 10(with a 12kV 30ma NST). " I had to use wire instead because when I tried with the copper tubing, I couldn't get it winded without it getting all kinked up so I used wire. How do I use the signal generator and O-scope to tune it to the secondary?
Registered Member #3768
Joined: Tue Mar 22 2011, 12:46AM
Location:
Posts: 107
The oscope at my school doesn't go to 211kHz though, do I need it too? that is the resonant frequency of my secondary coil. What exactly am I looking for? I know I am supposed to alter the primary tap. But connecting the capacitors, primary coil, oscop, and signal generator creates a huge mess of wires that I know is affecting the resonate frequency.
Registered Member #6038
Joined: Mon Aug 06 2012, 11:31AM
Location: Salado, TX
Posts: 248
All those wires will not have that significant an effect on your tests. You will have to fine tune later when the coil is operational, but for now, you want to get the two coils as closely tuned as possible, so you can at least see some results when you fire it up. Unusual for a scope not to handle 211kHz - that's pretty low frequency. As you saw in the video you are looking for the spike in output voltage as you sweep across a range of frequencies with your signal generator. What sig gen are you using?
Having coated wire does make it a lot more difficult to tune as you can't simply slide a connector from one point of the coil to the other. You can try remove the insulation from the wire which will be tedious but make tuning a lot easier. Then you will have to ensure that the turns in the primary are not touching each other.
If your test equipment is not sufficient, you can always go back to basics and do some math - there are free Tesla tools out there that will allow you specify coil parameters, capacitance etc to get the right configuration. Again, may get you close enough to resonance that some fine tuning is required when it's running. I always do this first before even hooking up any electronics to tune it.
Registered Member #7267
Joined: Tue Oct 16 2012, 12:16AM
Location: Detroit, Michigan
Posts: 407
How do you know it is effecting the frequency? It should not unless you place all the equipment right next to the primary. You could also use javatc or deepfriedneon calculator to make a table of inductances with their respective LC frequencies at different tap points. Then fine tune the primary by trial and error of different tap points that are close to your calculated resonant frequency.
Registered Member #3768
Joined: Tue Mar 22 2011, 12:46AM
Location:
Posts: 107
I think I may just try and rewind the primary with 1/4inch copper tubing, 1/4 inch spacing, any tips on how to wind it and with what supports? I tried it before and it went horribly wrong, the tubing got all kinked up.
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.
Tuning a primary coil.
