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 #1321
Joined: Sat Feb 16 2008, 03:22AM
Location:
Posts: 843
Well I've been going crazy trying to figure out the puzzle of how to clamp a ferrite transformer together so that it's not only secure and mechanically rugged but also flexible...and I came up with this:
This type of arrangement can be either stand-alone as shown, or it can be mounted vertically or horizontally to a chassis.
Luckily as it turns out, there's just enough room between the core and the bobbin for an 8-32 (or maybe a 10-32) threaded rod. In this case I used a nylon 8-32 threaded rod. The nylon seems to work good because it's somewhat flexible and forgiving, yet it has enough tensile strength that it can safely provide over 200 lbs. of clamping force (according to my crude calculations for two 8-32 rods).
Registered Member #1321
Joined: Sat Feb 16 2008, 03:22AM
Location:
Posts: 843
Do you think those nylon threaded rods will stretch over time and loosen up? I'm hoping they won't since I don't have them stressed very much, but I've never used nylon rod for anything before so I don't know.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
jpsmith123 wrote ...
Do you think those nylon threaded rods will stretch over time and loosen up? I'm hoping they won't since I don't have them stressed very much, but I've never used nylon rod for anything before so I don't know.
Nylon wont have this problem, if i remember right. but some plastics, like PE will gradually change its shape continuosly... so im thinking your fine.
I suspect thats why nylon plastic is chosen for this purpose.
Registered Member #816
Joined: Sun Jun 03 2007, 07:29PM
Location:
Posts: 156
The only thing I’ve noticed about the white nylon, is that is does degrade a bit with the U.V in sunlight, if ever that were an issue. Try to keep the clamping force equal by tighten/loosening each bolt a little at a time, I’ve chipped fragments off smaller cores before realising how prone they are to damage when assembling or dissembling them, but being bigger yours may be more robust in that respect.
I suppose if you do have any problems with the nylon, you could always use a slightly longer frame and put the bolts on the outside of the coils, then use brass bolts instead.
Registered Member #1321
Joined: Sat Feb 16 2008, 03:22AM
Location:
Posts: 843
When I assembled it, I was careful to tighten the wingnuts down evenly, by tightening one side a little bit and then the other side, going back and forth a few times. And I actually did not make them very tight, yet I was pleasantly surprised to see how well the ferrite core is held in place just by friction with the cpvc.
A real world test happened the other day when I accidently bumped it...pretty hard...and I knocked it over and it translated a short distance, and I picked it up after that and looked at it carefully and there was no apparent damage. If the ferrite moved at all (with respect to the cpvc top and bottom pieces) it was only a tiny if not imperceptible movement.
I was going to use brass if necessary but my first choice was to do it all out of insulating materials. (BTW thanks for the compliment).
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.
Ferrite Transformer Mounting Hardware
