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 #3610
Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506
Camp Badger wrote ...
ok so im waiting on another flyback because the one i have has a ferrite core that is to close to the plastic housing to wrap magnetic wire around, and I think the sound quality on your setup sounds really good! On a side note: what if you wired up two transistors instead of one? You would probably not need to ice cool it like you do in the video... I only have one in my plan because it's not supposed to heat up very much. Oh and I cannot find that 14.4 volt powersupply at the moment but would a 12volt car battery charger work? and if so should i run it at 2 amps or 10?
Look for a suitable internal winding. Most flybacks have a filament winding, it's designed as a 6.3V secondary but you can drive it as a primary and it works just as well. Most will tolerate at least 35V although you will usually get arcing between other pins on the bottom if you go too high.
Registered Member #3781
Joined: Sat Mar 26 2011, 02:25AM
Location:
Posts: 701
ok, I built it and used the PSU for 12 volts of power both on the primary winding and the circuit itself with a common ground. I used solid strand 18 gauge wire for the primary winding instead of magnet wire. But it does not work and my 555 timer gets rediculously hot, i checked for any short circuits and did not find any so I dont know what is happening.
Registered Member #3766
Joined: Sun Mar 20 2011, 05:39AM
Location:
Posts: 624
Hmm, the timer itself should never get hot, the MOSFET is normal, but the chip shouldn't get too hot. What is your R1 value? (between Vcc and the discharge pin (7)) If it's too low you will essentially be shorting Vcc to Gnd through the chip, which could explain the heat. Can we see a schematic?
Registered Member #3610
Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506
What would? Using a proper gate drive will keep the 555 from getting warm and may reduce mosfet heating due to it spending less time in the linear range where it is not fully conducting. Much of the heat in a circuit like this though is from the mosfet absorbing the spikes that result on the primary each time the mosfet turns off. A snubber will reduce this, but the snubber will heat up too.
Registered Member #3781
Joined: Sat Mar 26 2011, 02:25AM
Location:
Posts: 701
IT WORKS!!!! I re-built the circuit for the 555 and it works now! I think i just had my MOSFET hooked up wrong. But I do have arcing between the pins on the bottom which set the casing on fire haha, so should i put on a few more turns on the primary? If so, how many? or should i cover the exposed pins with insulation?
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.
555 Timer Plasma Speaker
