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 #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
At one stage I was doing voltage readings on my 1.5kJ pulse caps for can crushing. I was only getting a puzzling damped curve on the CRO where I should have been getting a ringing discharge with voltage reversal. To test this, I put 5 or so 1N4007's across the cap in reverse. No problems charging but when fired the diode chain exploded presumably after 80% voltage reversal (1.2kJ) got dumped back into the diodes. The only bit I ever found was a small bit of black diode plastic embedded in my wrist. The rest of me was behind a blast shield.
So the voltage reversal was there all right and the problem was too much inductance in my voltage divider leads. Peter
Registered Member #79
Joined: Thu Feb 09 2006, 11:35AM
Location: Arkansas
Posts: 673
On my first tesla coil, I built one of those spark plug spark gaps. Nobody told me not to use the "resistorized" kind. I had no idea. Darn things started exploding quite loudly sending ceramic shrapnel all over the place. I got a nice knot on my head where one of the "knobs" hit me and a pretty deep cut on my arm. Didn't go quite as I had planned!
Registered Member #180
Joined: Thu Feb 16 2006, 02:12AM
Location: Ontario, Canada
Posts: 187
My new tesla coil's bridge exploded the other day after I fed it with filterd DC, then i tried it again today... same thing happend. The mosfets blew up pretty good and the thing lit on fire, haha oh well guess i have to make another one now
Registered Member #180
Joined: Thu Feb 16 2006, 02:12AM
Location: Ontario, Canada
Posts: 187
What I think happened was that the mosfets gate shorted, and the mosfets blew up. But also the resistors on the gates fried too, and they lit on fire (that little blob of silver below the cap in the above pic was a resistor and solder). Since the resistors were really close to the cap i think it just melted it and then it shorted out and it lit on fire too haha... and a second later it was all gone
This is what it looked like after with everythign still mounted.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
That mosfet with blown gate obivously sent it off (gate, the leg) and physically smashed/burnt cap, resistors, and entire bridge got pulverized.
Or maybe cap was first really??
Gate breeches are usually worst kind of failure for mosfets (very often explosive), they dont like it at all. I dont ssee any zeners or TVS at gates maybe it was the problem...??
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.
Most spectacular failures
