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 #1169
Joined: Wed Dec 12 2007, 09:16AM
Location: Portland OR
Posts: 251
Wirenut wrote ...
How much inductance is too much? Is that something i'm going to have to "tinker" with until things stop blowing up?
I don't think so as long as you don't forget the snubber cap like I did. I think the rule of thumb is to try to keep the connections between the large electrolytics and the half-bridge as short as possible. I think to best way to do this is to put the caps and bridge head to head, but the caps I used were massive (nearly 1' long) so I had to put them sort of side by side with the bridge to get everything to fit inside the base.
Is there an effective way to shield the wires from inducing currents in other components?
I just used tightly twisted pair wires for the connections from the current transformers and to the gate transformer.
By snubber cap you are referring to the c101 capacitor correct? sorry I am not an electrical engineer. I think the most trouble I have with this forum is all the acronyms being used to describe things.
Registered Member #141
Joined: Sat Feb 11 2006, 01:14PM
Location: Southern California
Posts: 96
hrmmm some of the pics are not showing up... if you need hosting space or something let me know.
I think you get the image disabled tag if you're not logged in. Log in and try again. Also, the img disabled tag should be clickable even if you're not logged in.
Registered Member #1169
Joined: Wed Dec 12 2007, 09:16AM
Location: Portland OR
Posts: 251
Wirenut wrote ...
hrmmm some of the pics are not showing up... if you need hosting space or something let me know.
I think you get the image disabled tag if you're not logged in. Log in and try again. Also, the img disabled tag should be clickable even if you're not logged in.
its working now. looks very nice. few questions tho...
1. did you use the advance modulator described in the book or something different? 2. you MMC looks different as well. was this to relive some stress in the capacitors? 3.i noticed in the the pictures you the arcs were striking the ground and not targets, does that reduce the reliability of tesla?
Registered Member #141
Joined: Sat Feb 11 2006, 01:14PM
Location: Southern California
Posts: 96
1. did you use the advance modulator described in the book or something different?
Yes, I used the advanced modulator. Here's a shot of the inside:
2. you MMC looks different as well. was this to relive some stress in the capacitors?
The specified mmc should work fine if you provide adequate cooling as per the design. My layout basically provided no airflow at all, so I overheated them. I should also point out that this was while running at maximum primary current without the current limiting circuit, which is obviously beyond the design specifications.
3.i noticed in the the pictures you the arcs were striking the ground and not targets, does that reduce the reliability of tesla?
I think if the coil was arcing continually to ground or a grounded target, then yes, that would push the limits of reliability, but what you see in the pics are only momentary strikes that last fractions of a second. I don't believe these kind momentary arcs are a problem, and I haven't had any failures since putting everything together correctly.
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.
Minibrute Construction Thread / FAQs
