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 #1218
Joined: Tue Jan 08 2008, 02:13AM
Location: College Station, TX
Posts: 9
I'm new to this forum, so please allow me to introduce myself:
I'm a Freshman EE major at Texas A&M University with a lifelong background of electronics. In seventh grade I began experimenting with High Voltage stuff. I believe it was Sam Barros' PowerLabs website that sparked this interest.
I just built a low-power flyback driver using the simple 555-based circuit. Attached is a picture of the unit. It runs nicely, drawing only 180 mA unloaded and 2 A when arcing. It is in its final stage except for swapping its IRF730 with an IRF540. After this modification is made, I'd expect about 18 kV out with 12 VDC in.
Now, I would like to take this circuit to the next level. I would like to keep the basic design the same except for:
Larger filter cap (4700 µF instead of 470 µF, at least 35 V) MC7812 12 V 1A voltage regulator driving the 555 (*WHY do these get so hot? I blew two of them with only 20 VDC in driving a 555) STW18NB40 High Power Mosfet 400V 18.4A instead of IRF540 (larger TO-247 for better heat dissipation on heatsink approx 2x the size) Second 10K potentiometer for adjusting duty cycle.
Does this all check out? If all goes well, I'd like to be able to get around 30-50 kV out of this new circuit at 24 V input using a standard DC Flyback.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
You should be fine, just make sure that you use isolator tabs between the mosfets and the heatsink (the tab on a regulator is usually ground where on the mosfets it is connected to v+)
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.
Suggestions For High-Power 555/MOSFET FB Driver
