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.
I am doing a project where I need to generate some very loud snapping sound, and I decided to use a Marx generator for that purpose. The problem is, I am not sure what to use for my triggering circuit. I know you can trigger the stupid and easy way with an insulating screwdriver, but I want to trigger the circuit electronically, cheaply and simply. Besides using trigger transformers is there another way to trigger the spark gaps? The visual is totally unimportant, I just need the sound. Thanks.
Also, this is a good way to generate the snapping sound, correct?
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
How regular do the pulses need to be? You don't have to use a trigger to trigger the gaps because once one breaks down, the others will break down too. Is this right?
I need to produce around 165dB to 200dB of sound relative to 1uPa, which works out to mean a circuit producing somewhere between 200W to 600W of power. The sound doesn't need to be periodic, but preferably there should be a way to control the duration and the magnitude of the sound produced.
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
165dB to 200dB of sound relative to 1uPa ... between 200W to 600W of power
err, show your working. Each "snap" will have a certain energy, so by W do you mean J, or are you assuming a repetition rate?
Once you have a snap from an arc, there's not really a way to control the duration of the sound.
Do you really need the complexity of a Marx? The same energy produces pretty much the same bang from the same heating in the arc, whether from a high voltage or a low voltage discharge, perhaps more from a short low voltage arc than a long high voltage arc. So connecting all your marx caps in parallel with the first stage and triggering that lot ought to be just as good, if not better, than a full marx.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
I think that what he means by '600w of power' is that it would take about 600w of power to get a speaker making that much sound.
To generate 200dB of sound pressure using a marx generator will be tricky, I think that you migt be better off using triggerd spark gab. That works by charging a capacitor (you are probably going to need a bank of electrolytic caps series to get about 2kv with about 500-1000j) between 2 large electrodes that are almost close enough for it to spark, but not quite. The you take a 3rd electrode (this one doesn't need to be big) that is connected to a trigger transformer, which could be made with either a flyback transformer or ignition coil with a 5uf/100v poly capacitor that can be connected across the primary by means of your trigger switch).
I think that what he means by '600w of power' is that it would take about 600w of power to get a speaker making that much sound.
To generate 200dB of sound pressure using a marx generator will be tricky, I think that you migt be better off using triggerd spark gab. That works by charging a capacitor (you are probably going to need a bank of electrolytic caps series to get about 2kv with about 500-1000j) between 2 large electrodes that are almost close enough for it to spark, but not quite. The you take a 3rd electrode (this one doesn't need to be big) that is connected to a trigger transformer, which could be made with either a flyback transformer or ignition coil with a 5uf/100v poly capacitor that can be connected across the primary by means of your trigger switch).
So the third electrode is supposed to be somewhere between the spark gap? And I am supposed to create a pulse with the trigger generator?
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.
Marx Generator trigger circuit?
