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 #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
I switched over to secondary base current feedback, added an interrupter and soldered up a board. This was done two weeks ago now, but due to a lack of Internet connection and a different project I haven't gotten around to keeping you guys in the loop. The other project is a power supply for this thing which I hope to finish soon so I can wrap this coil up.
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Thanks for the compliments. I forgot to mention that I added audio modulation as well. The streamer hisses a lot so the sound quality isn't great, but it works. The first time I tried audio modulation I sat and enjoyed it so long that the breakout point melted through the top of the former! That only took about 2 minutes, so audio modulation won't be used very often with this coil. The secondary itself was warm at this point too.
You can sort of see the transformer core in the picture, I just grabbed it from an ATX supply. I don't think the turns count is very critical, say about 30.
Registered Member #180
Joined: Thu Feb 16 2006, 02:12AM
Location: Ontario, Canada
Posts: 187
For the secondary base feedback, that transformer is it the little yellow toroid one thats on the output, I think its for current sensing? If it is did you even rewind it or just use it as is? That'll be sweet if its that easy to get good secondary feedback.
Registered Member #941
Joined: Sun Aug 05 2007, 10:09AM
Location: in a swedish junk pile
Posts: 497
CT2, if you mean the yellow one with white rim on the output of computer power supplies, then the answer is no, you cannot use these as current transformers since they are iron powder cores indended for dc filter operation.
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
It was used a a CT in the power supply and I used it as is. If it has one turn going through it which is in series with the main transformer it's the right one. I've found them connected to the base drive transformer too, but it's primary will still be in series with the main power transformer no matter where it is. The only yellow toroids I can recall are the huge filter inductors, which are unsuitable. Pretty much every ATX psu I have come across has had a CT for short circuit sensing.
Registered Member #180
Joined: Thu Feb 16 2006, 02:12AM
Location: Ontario, Canada
Posts: 187
HFsstc-freak I know the big toroid on the output cannot be used for this application, but I wasn't referring to that one. Uzzors is this the same toroid that you used? It currently has 20 turns on it, I didn't think that was enough but you said you didn't modify it?
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
That's the type CT2. Since the input of the 4046 is very sensitive and has a high impedance almost any turns ratio will work. I measured the signal at the input and it was only 1Vp-p IIRC. Since I doubted such a weak signal could actually provide feedback I disconnected the CT only to find I couldn't tune the coil anymore, so it definitely works. I didn't use a burden resistor, just two 1N4148s to clamp the signal (just in case) and a 10nF cap from there to the input of the 4046. I guess it's about time for a schematic.
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.
Small Class E PLL Coil
