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 #989
Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
The secondary winding position is the same =/ Tryed to change GDT Turns, winded on the same core, first has 10 turns, second 20 turns. no difference at all. Tryed to change the GDT Core from Blue to Black, 12 turns on the new one. No changes too.
Registered Member #229
Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506
Parallel two TCs for each GDT input (without 540/9540, maibe too much delay) and use a 1-4 microF for DC blocking cap. Maibe you need more current to switch the fullbridge.
Registered Member #989
Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
With TC's the output is the same, but the TC's got too hot. If it was delay, the problems was on Higher Frequencies not lower ones. I found one 10uF 250V Polyester Cap here, its from strobe lamp driver. Its too much for the GDT Cap?
Registered Member #989
Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
Ok, tryed 10uF on GDT Cap, nothing happens different. Tryed to increase the Primary Cap (that goes in series with the primary) from 1uF to 3uF, nothing happens too.
Changed the secondary to a little bit higher fres, same thing happens, increasing the topload, decreases the spark size.
I really dont know what is happening here. All things is fine... Any more ideas? (PS: One IRF9540 is with a little more heat than the other mosfets. Changed it, but it gets the same heat. But the board is correct. I think that is because I running CW)
Registered Member #229
Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506
If it is an antenna driver it is very sensitive for the position of the antenna. Do you feed it from the mains outlet or from an transformer? Maibe higher current capability is needed? Maibe you changed something in the circuit? Reversing the polarity of the primary and but not also on your GDT primary? Wrong position of a TC chip in its socket?
Registered Member #2315
Joined: Tue Aug 25 2009, 02:35AM
Location: Leyte, PH
Posts: 161
my 1st SSTC was interrupt driven, now my SSTC with CT feedback runs in CW mode(my interrupter REMOTE is not done yet).. have tried it with 100Vac stepdown transformer rated 500W and ran it with fullbridge smoothed(100uF) for short periods of time (maybe 1-2 seconds)..I could get 2" corona "brushes"... all is OK but I dont push my luck with CW ..Im only using IRFP450
im using 470nF on my gdt primary.. if 1 mosfet IS heating, might be your zener/s in G/S is dead.. or maybe a failing mosfet gate resistor... or maybe a shorted? GDT winding..
Registered Member #989
Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
The antenna works the same independent of the position. I am feeding from mains with a variac, but the current when I put toroid is lower than without it. (10A without, and 5A with)...
I tryed to reverse all polarity (GDT and SSTC Primary), if out of phase, it doesnt work at all (and no current is drawn)...
The TC position is fine, it soldered direct on the board I only have one TC4426 that is dual mosfet driver, for handling the IRF540/9540 FullBridge driver for GDT. And it runs very cool.
Raff: Its one mosfet from the GDT Bridge not from the SSTC bridge. The Fullbridge of IRFP250N is running very cool. And I dont have zeners on the bridge at all. Only gate resistors (5 Ohm). All resistors are ok, so is the mosfets on the GDT Driver, and so all the circuit (I tested it)...
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.
SSTC - New Secondary = Problems
