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.
Create a stable arc across a slit in a box, then use one electromagnet inside the box and maybes one outside to oscilate the arc back and forth. This might then act like a speaker cone, except it will have almost 0 mass so could be an improvement over the traditional design?
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
Using a blank HD's platters and heads to write down single event things so you can view them later. Everything would have to be timed perfectly to avoid jumps in the data.
Registered Member #2028
Joined: Mon Mar 16 2009, 08:13PM
Location: Norway
Posts: 319
I have been toying with the thought of an amplitude modulated SSTC, replacing the standard bridge operating in linear mode with a high voltage DAC operating in a saturated mode. This should allow for a lot higher power throughput.
Im just venting my brain, i have no idea wether this is even feasible.
Heated windshield wipers. I'm this close to just taping some resistance wire on the damn things.
Thats a pretty good idea :D Would work even better if you could add another setting to the car that would slowly move the wipers across the screen to defrost it in one swoop
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
ooo... use some conductive tape harvested from a defunct fish tank/terrarium heater?
Also another idea is to wind ultrathin nichrome wire round a glass rod, and glue this inside a second glass rod. Or glue it between two glass sheets using UV reacting epoxy.
Myke wrote ...
Using a blank HD's platters and heads to write down single event things so you can view them later. Everything would have to be timed perfectly to avoid jumps in the data.
Use a piece of ZnS film mount it on hdd platter, "flash" it with infrared to drain the luminescence then record the signal to that using UV LED. recirculate the signal using a pickup to compensate for decay...
this might work well, as a green LED will sense the luminescence nicely. Make a Turing machine? :)
Registered Member #1451
Joined: Wed Apr 23 2008, 03:48AM
Location: Boulder, Co
Posts: 661
AS long as the wind shield wiper is going... Make a matrix-contact type sensor plate and determine how hard the rain is coming. Clear the plate with every wiper swipe and time how long to reach a certain resistance? Then use this to adjust speed of wipers!
Registered Member #1497
Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
If we're on the topic of using HDDs to store single event information, why not use a VCR or old audio casette recorder to record data from experiments? A known playback rate would make the data consistent for the most part no?
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
I was thinking of capturing pulses or edges so that's why I was thinking of something that moved pretty quickly so I could capture a lot of the detail. A VCR/cassette tape is a good idea. I guess I could run the VCR tapes really really fast and capture things that way but I don't know what would happen to the tape if it went that fast. How do scopes capture single event things if they don't have a CRT that makes the already exposed phosphors glow?
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.
The ideas thread
