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 #134
Joined: Fri Feb 10 2006, 10:44PM
Location: Belgium
Posts: 86
Hi,
I recently found some schematics to build a very simple acoustic voltmeter. It's basically a device built around two BC547 transistors which 'converts voltage to sound'. Doing that, you can hear the voltage, and, according to the author of the article (which was covered in Elektor), it's possible - with some training of course - to be able to tell how high the voltage is, which waveform it has etc... just by listening.
Has anyone got any experience with such a device? I'll probably build one soon, but I am not in the mood right now
Registered Member #177
Joined: Wed Feb 15 2006, 02:16PM
Location: Munich, Germany
Posts: 214
Well, it is actually just a VCO, a voltage controlled oscillator. Its a nice starter project und can be handy if you don't have much space and you only have to know rhougly what voltage is applied.
Although, they are a nice way to transmit a voltage from point A to B if you have a precise Freq to Voltage converter. Better then your ears that is.
Registered Member #65
Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155
This is fun too (free): "Oscilloscope for Windows is a Windows application that converts your PC into a powerful dual-trace oscilloscope. Oscilloscope uses your PC's sound card as an Analog-to-Digital Converter (ADC) to digitize any input waveform (speech, music, electric signal, etc.) and then presents it on the monitor in real time, allowing the user to control the display in the same way as on a conventional "standalone" scope, for example change gain, timebase or plot Lissajous patterns." ( )
2914 and 2915 level LED level chips are a classic too, Cheers,
Registered Member #134
Joined: Fri Feb 10 2006, 10:44PM
Location: Belgium
Posts: 86
Fun too, and free, if you can trust yourself not to connect anything too nasty to your soundcard, and don't mind low frequency...
Indeed; I once tried that winscope-thing and fried a (very old) sound card (It was my own fault, though, I connected a 21V AC transformer directly to the thing ; yeah, those were the old days )
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
The idea is very useful because you can hear things that are impossible to see on a regular oscilloscope. I have several times debugged strange problems by listening to signals that looked perfect but had regular distortions that were audible.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Bjørn Bæverfjord wrote ...
The idea is very useful because you can hear things that are impossible to see on a regular oscilloscope. I have several times debugged strange problems by listening to signals that looked perfect but had regular distortions that were audible.
This probably do to the fact that those regular distortions occurred at a frequency interval other than that being triggered. If you were monitoring a 100kHz signal, for example, you would never be able to "see" a distortion with a rep rate of say 800Hz, etc...
Registered Member #134
Joined: Fri Feb 10 2006, 10:44PM
Location: Belgium
Posts: 86
Or a pakaderm...?
What's a pakaderm?
The idea is very useful because you can hear things that are impossible to see on a regular oscilloscope. I have several times debugged strange problems by listening to signals that looked perfect but had regular distortions that were audible.
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.
Acoustic voltmeter
(It was my own fault, though, I connected a 21V AC transformer directly to the thing 
)
