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 #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
That was a well-produced and instructional video. But we could replicate all those destructive demonstrations using batteries of well-chosen rechargeable cells, in about the same total size and voltage. And the relative depletion of the stored energy would be much less. Shall we start with lead-acid, NiCd, NiMH, Li-ion, or Li-poly?
Of course for us nerds, it's way cooler to do it with capacitors. But to beat batteries you'll need to look for other applications.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
Try bending a piece of coat-hanger wire so it can directly bridge the two capacitor terminals. It ought to get red-hot at least (steel wire needs many more volts per inch than copper wire). I used to do that with a pair of ancient flooded-plate NiCd cells. each the size of a pack of cigarettes.
How about making a 250 amp capacitor charger, using a rewound MOT and a couple of big Schottky diodes? Then make a regulated boost converter to run, say, an electric scooter as the cap discharges from 2.5 volts to, say, 1.0 volt. (using 84% of its stored energy). You can run the set for many thousands of cycles, with a period on the order of one minute -- hard to match with batteries.
I thought about making an extremely-low-frequency LC tank circuit. The boostcap documentation says many types are symmetrically constructed, although frequent voltage reversal is abusive. But 3600 F is an impractically high C value, and would require impractically low R values in the inductor to make an under-damped RLC.
Registered Member #4081
Joined: Wed Aug 31 2011, 06:40PM
Location: UK
Posts: 139
Just melted some 4 gauge with a rewound MOT, which will deliver the most current, the MOT or the boostcap? Logic tells me it the capacitor But in the vid it took quite a while to melt that wire
Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Harry wrote ...
Just melted some 4 gauge with a rewound MOT, which will deliver the most current, the MOT or the boostcap? Logic tells me it the capacitor But in the vid it took quite a while to melt that wire
Yeah, but the voltage wasn't at the highest when I did that. It was around 2 volts if I remember correctly.
And, I would make a boost converter for it, but it's rather hard to find ones that work from 2.5 volts down to 1 volt...
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.
What to do with a Boostcap?
