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 #2871
Joined: Sat May 22 2010, 06:50PM
Location:
Posts: 81
I think to make my own flyback hv transformer...For ferrite core i think to use a ferrite core from one of my flybacks,but i am not sure if it deserves the labor..Also i don't know how much turns must make the secondary and with what awg magnet wire....
I think to make something like this:http://www.pocketmagic.net/?p=1187
I will take better results than an ordinary flyback?
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
i would get the circuit running with an ordinary flyback first and come back to that later. if you make your own coil it can be hard to insulate i use candle wax for insulating things because it is cheep and repairable.
Registered Member #2871
Joined: Sat May 22 2010, 06:50PM
Location:
Posts: 81
i bought a new ferrite core and i made a good 47-55uH inductor,but again i take a poor output!I take a 2cm purple/orange thin arc...If i change the zener diodes(12v) with 9V zener diodes i will take better results?Also can i connect in series a ordinary 12v transformer with my 12v PC PSU to take 24V 13A?And one more question about pc psu..Can i connect the +12v rail with the -12v rail to take 24v?
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
The choke must have more inductance that the inductance of the primary coils, or the circuit may enter an alternative oscillation mode that leads to destruction, and it shall not saturate. Smaller zener voltages will increase the resistance of the mosfets, resulting in heat and poor performance. Transformers don't work with DC (!?). You can use the -12 V output as ground and have 24 V at the +12 V output.
Registered Member #2871
Joined: Sat May 22 2010, 06:50PM
Location:
Posts: 81
What you mean transformer dont work with Dc?Also if i connect the +12V(10A)rail with the -12v(0.8A) i will take 24v output but how much Ambers?Also have i any risk to destroy my ATX with this connection?
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
aris wrote ...
i bought a new ferrite core and i made a good 47-55uH inductor,but again i take a poor output!I take a 2cm purple/orange thin arc...If i change the zener diodes(12v) with 9V zener diodes i will take better results?Also can i connect in series a ordinary 12v transformer with my 12v PC PSU to take 24V 13A?And one more question about pc psu..Can i connect the +12v rail with the -12v rail to take 24v?
I could not find 12v zeners so I used 15v zeners just dont go over 18v. The lower you go the more you will get into cutoff with the fets so I would not go below 10v. Do you you have a polypropalene cap with low ESR because I suspect that you ara not building enough circulating current in the primary.
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.
first zvs/mazilli driver!Help!
