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 #964
Joined: Wed Aug 22 2007, 12:39AM
Location: Stockton, CA
Posts: 134
I want to do a flyback driver circuit, but I'm still wondering what the best first-time circuit would be, like a balance between simplisity (spelling? can't find the spellcheck...) and performance. I don't really want to do the single transistor/mosfet designs, I've read that they don't work too well... I've found some 555 drivers, but I don;t know what kind of performance they have. I've read around, but I can't seem to find what I'm looking for, so I'm looking for someone with experience's opinion.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
I am quite fond of the mazzilli driver because it is cheap, simple, and can provide more than enough power.
But a simple 555 running a 1/2 or fullbridge should work fine too. Also, it is easier to tune for resonance with the 555 driver (just twiddle the pot), which allows you to get very large voltages out.
Registered Member #964
Joined: Wed Aug 22 2007, 12:39AM
Location: Stockton, CA
Posts: 134
... wrote ...
I am quite fond of the mazzilli driver because it is cheap, simple, and can provide more than enough power.
But a simple 555 running a 1/2 or fullbridge should work fine too. Also, it is easier to tune for resonance with the 555 driver (just twiddle the pot), which allows you to get very large voltages out.
Err, the link to the circuit isnt working. Or is the circuit the pic on the bottom of the post? That driver looks like one of the ones on uzzors page.... I think I'll try the mazzilli if I can find the actual schematic. For this driver what type of flyback do you recommend? I'm getting a bunch of the xformers, with built in diode, removable, and no diode. I think I'll try the 555's on the other ones and one of them the plasma generator circuit that'll come with them.
EDIT: DOH! that picture IS the mazzilli.... cool. I am also wondering what those transistors are... some kind of mosfet? EDIT 2: DOUBLE DOH! it says what the transistors are in the picture....
Oh wait.... what are those diodes on the mazzilli that have a little squiggle on their line? I've heard them reffered to as "zeners" but I'm not sure..
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
A zener diode is a diode that, in laymens terms, acts as a governor for voltage; a 10v zener will not draw any (noticeable) current at 9v, but at 11v it will look like a short circuit. If you are not running the circuit at >12v you should be able to omit them.
BTW, the best place to get the irfp250's is on ebay, they can usually be had for about $1 a piece. The best place to find the inductor is from an ATX computer power supply, use the big yellow 'donut' core, with about 40 turns of wire on it.
Registered Member #964
Joined: Wed Aug 22 2007, 12:39AM
Location: Stockton, CA
Posts: 134
... wrote ...
A zener diode is a diode that, in laymens terms, acts as a governor for voltage; a 10v zener will not draw any (noticeable) current at 9v, but at 11v it will look like a short circuit. If you are not running the circuit at >12v you should be able to omit them.
BTW, the best place to get the irfp250's is on ebay, they can usually be had for about $1 a piece. The best place to find the inductor is from an ATX computer power supply, use the big yellow 'donut' core, with about 40 turns of wire on it.
Thanks. I'll look around, but I have no ATX's.... Would is be possible to make my own? I have no idea how to measure uH's....
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
You don't have to measure the inductance of the inductor. Just put about 30-50 turns on it and it should be fine. Flybacks with built in diodes work fine with this circuit.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
If you build the "zvs" or "mazzili" driver, I advise you to put some spacers (thin sheets of non-conductive material- plastic, paper) between the 2 core halves of the flyback, the gap should be around 0.5mm. Without it the flyback often makes *really* nasty screeching sounds, and for flybacks with built-in diodes it also stores energy for the next half-cycle.
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.
Flyback project
Or is the circuit the pic on the bottom of the post? That driver looks like one of the ones on uzzors page.... I think I'll try the mazzilli if I can find the actual schematic. For this driver what type of flyback do you recommend? I'm getting a bunch of the xformers, with built in diode, removable, and no diode. I think I'll try the 555's on the other ones and one of them the plasma generator circuit that'll come with them.
