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 #105
Joined: Thu Feb 09 2006, 08:54PM
Location:
Posts: 408
Im wondering about the schematics for the audio amplifier on this page: For my audio tesla coil (yes, still working on it ), which circuit should I use? Figure 1 "Typical Audio Amplifier Application Circuit", or Figure 2:"Single Supply Application Circuit"?
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
If you're driving a Tesla Coil with the amplifier:
I did some work with the 22W BTL and I wasn't impressed with it at all!
The 50W looks promising as a driver, but I really think you need to go push-pull to get anywhere, otherwise you're just not pushing enough energy into a system.
So what I would probably resort to is designing a power supply for 2 amp modules and go push pull.
I would be concerned with strikes because one shot is going to destroy the amps.
Registered Member #105
Joined: Thu Feb 09 2006, 08:54PM
Location:
Posts: 408
The plan was suggested by blackplasma, which requires floating the gate of the mosfet at ~4V with a voltage divider, then connecting a audio amplifier to the gate and source. The +from the filter capacitor and bridge rectifier off mains goes through this modulated mosfet, then to the rest of the bridge. The audio comes from pushing the mosfet in and out of full conduction. In this case, it doesn't neccessarily need to be push pull right? That amplifier should be plenty, i believe, and it has a really large Vcc range- 24-84V, so I should have a transfomer that will work.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
A diagram of what you want to do would help a lot.
If you're just sending the modulated signal to the mosfet that's driving your TC I can't see how you would need anything more then a couple of watts of power.
Now if you're directly driving the primary with the amp, and AM modulated with your audio then you will need quite a bit of power.
Registered Member #105
Joined: Thu Feb 09 2006, 08:54PM
Location:
Posts: 408
Here it is. I think it has to be a good amplifier because it has to supply enough current to ghange the gate charge very quickly for good audio reproduction.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
On the contrary, I would say that the MOSFET gate needs hardly any power to drive it at all, at audio frequencies.
Now, Nelson Pass's Zen amp is a very simple audio amp using just one MOSFET. If I were doing this my plan of attack would be to build a Zen amp, plug a walkman into the input, and replace the current source transistor in the Zen amp with my SSTC H-bridge. You would be modulating the negative rail instead of the positive, but I don't see how that would matter much.
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.
Audio Amplifier Question
), which circuit should I use? Figure 1 "Typical Audio Amplifier Application Circuit", or Figure 2:"Single Supply Application Circuit"?
