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
I think this photo qualifies as cool, in the literal sense. My wife spotted it online. I think the caption said: "Photo of snow-covered Britain by Terra satellite, January 7, 2010." Am I mistaken, or is Ireland still green?
Registered Member #1334
Joined: Tue Feb 19 2008, 04:37PM
Location: Nr. London, UK
Posts: 615
It's not often we get snow here in the South of England, but we have about 12 inches and temperatures of down to -5C, which is almost unheard of in these parts...
Here's a shot of someone having fun! (he's a 4 y/o German Shorthaired Pointer, and has never seen real snow before...)
Registered Member #122
Joined: Fri Feb 10 2006, 12:55PM
Location: Milano Italy
Posts: 148
Hi All!
This is the new gadget i bought today on a local hamfest for 20 euros!
This is a variable HV power supply capable of 0-6kV output, both positive, negative, alternate, positive pulsed and negative pulsed.
is almost entirely electromecanic (there is a VARIAC to regulate the output voltage, a rugged rotary switch to select the capacitors and two robust relays to select the polarity and make the pulses) so is really easy to repair or modify!
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
@CoronaFix, nice little toy . What will you be using that for? I should make something like a lathe to hold glass. Maybe make glass stuff for a neat little hobby. If it didn't cost anything, i would!
@Nicko, snow is amazing, is it not?! Seen it twice here in Texas, beside that time it snowed maybe a few mm :P. The German Shorthaired Pointer sure seems to be having fun :). For some odd reason his/her coat looks almost like he/she is wearing... a coat :P.
@Fabio, nice! What wattage is it made for? Some 100-200 watts?
Registered Member #2040
Joined: Fri Mar 20 2009, 10:13PM
Location: Fairfax VA
Posts: 180
Nicko wrote ...
It's not often we get snow here in the South of England, but we have about 12 inches and temperatures of down to -5C, which is almost unheard of in these parts...
You have a soft spot for imperial units?
Pictures of the PCB for my current ultra-top-secret-classified-at-an-echelon-above-
reality project. There are is a TQFP and a TDFN package on the board, they have a 0.5mm spacing between centers!
Registered Member #2040
Joined: Fri Mar 20 2009, 10:13PM
Location: Fairfax VA
Posts: 180
Those are transmission lines, but I don't have any discrete transistors on the board. I'm bad at keeping secrets so I'm going to shut up while I'm ahead.
Registered Member #2261
Joined: Mon Aug 03 2009, 01:19AM
Location: London, UK
Posts: 581
Klugesmith wrote ...
I think this photo qualifies as cool, in the literal sense. My wife spotted it online. I think the caption said: "Photo of snow-covered Britain by Terra satellite, January 7, 2010." Am I mistaken, or is Ireland still green?
I just found the original high resolution image here
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.
Post Your Cool Pic Here!
. What will you be using that for? I should make something like a lathe to hold glass. Maybe make glass stuff for a neat little hobby. If it didn't cost anything, i would!
