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 #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi, .. OK, it works.. sort of works.
I finally got myself motivated after a month or so. Run was at 30V and I got up to some 3 inch sparks, but it tend s to lose feedback and do wierd things again.
Sparks look way more healthy than 15mm sparks my halfbridge coil gave for same input, now I just need to be careful not to do something stupid and blow the IGBT's.
Caps I used are also a bit poor, and they slightly increase temperature even with those short runs!
I surely won't be pumping more power before I get scope connectors and everything fixed in place.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
at time, I get some 15cm sparks with 18% (60V) input voltage and pretty high ON time, over 250us. At more realistic 100us I seem to get only 10cm sparks.. point to point. There's only some little corona on breakout point and yet coil manages to drive my USB devices completely nuts. I'l have to continue with it in garage.
Part about tuning has become a bit erratic.. coil seems to work better when I tune lower than resonant even at these little powers. If undertuned, ceramic caps start getting hot and change capacitance heavily. And at some point, I got flashovers between primary and secondary, even though primary goes only for 4-5 centimeters over the secondary winding!
PS. just a quicky question about OCD: I see that faster comparators like LM311 are commonly used (wich I don't have any at moment), so can I use something like LM393 (1,3us)? Considering my period of about 10us it looks 'just fine', but should I perfer a faster comparator for some reason?
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
I also hate the caps, but they still seem to work better from polyester I used before.. polypropylene are way more stable. I just wanted to see if they would work.
Expecting 400..500A as a final maximum for overdriven TO247 30n60's capacitors would suffer only 10..20 amps of peak curent each, but they simply aren't made for high frequency operation of any kind.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi everyone
I bought a large amount of 942C20P15K caps and promptly ditched the ceramics.
The project was mothballed for a while (err, 2, or 3 months, or so) due to lack of motivation but I'm pretty sure it will get going now after school is over.
I also have enough caps to build a SGTC and possibly many other things...
These caps are really huge, more massive than I tought. I don't think I will have easy time blowing those up.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
Firkragg nice design,can't wate to see it run. they were big for my project too and this this is how compact I got them. I haven't run them yet so and i dont know if they will flash yet.
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.
Marko's DRSSTC v1.1
