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 #2038
Joined: Fri Mar 20 2009, 03:39PM
Location: Bristol Uk
Posts: 60
This week I've been trying to source the components for a terry filter, The MOV's i have found no problem, and i have enough bleed resistors left over from making my MMC. But i'm not sure about the 3.3nf 1600v capacitors, I've found these on RS and wanted to check to see if they are any good.
Also the 1K 100w resistors are proving a little hard to find, the one i have found looks nothing like the traditional type of wire wound resistor most use in terry filters. i am aware that it needs to be a non inductive type, the inductance of this resistor is 40nH at maximum, would it be suitable?
I'm also a little concerned that it needs to be heatsink mounted, is having a big chunk of metal in amongst all the HV stuff going to be a problem? looking at the terminal to heatsink insulation rating value of 2.5kv rms i guess the heatsink should not be grounded?
Space is quite tight around the base of my tesla coil, I was thinking of making the whole terry filter assembly like another shelf of my MMC, am i likely to encounter any problems with this? i currently have about 6" in height to play with, this has to be enough room for 2 shelfs of capacitors and the Terry filter.
Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
Ryan - I believe the power resistors Terry Fritz used in his original R-C filter design were just conventional wire-wound resistors, not special "non-inductive" parts (not monolithic element or Ayrton-Perry winding).
Although from a purely technical view a non-inductive resistor might be be superior in a circuit seeing broad-spectrum RF noise , simple, low cost wire wound resistors seem to be more than adequate for this application. 1K 100W tubular ceramic-core wire wound resistors show up pretty frequently on eBay, or can be bought new from any of the major electronic component suppliers.
Mount the tubular-core resistors on 1" ceramic standoffs and they will be fine. They tend to run quite hot, so if they end up close to other heat-sensitive components make sure that you provide enough airflow to carry away heat. Because the ceramic cores hold a lot of heat, design your cooling system so that the fan can run for several minutes after everything else has shut off.
Registered Member #2038
Joined: Fri Mar 20 2009, 03:39PM
Location: Bristol Uk
Posts: 60
TheBoozer wrote ...
My Terry filters were assembled from parts obtained at DigiKey...
My caps were P10501-ND My resistors were L100J1K0E-ND
Thanks for that little tip, i had kinda ruled Digikey out as in the uk i normally can source things cheaper from Radiospares or Farnell, after a lot of seaching i found these exact resistors on the farnell site, but they are us stock, and there is a hefty import charge.
However, on this ocasion Digi key are very competetive. £7.17 each for the resistors and no import costs.
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.
Components for terry filter
