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 #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
Don't know why the driver I have just fails, gets warm on 12v input...
Here the 555 in 13vdc, and 45volts into the FET, limited by the primary of a ignition coil, as it's the only thing that doesn't melt, because of oil in it.
Sorry about the quality couldn't focus webcam...
Very little arcs here about 3.4cm very low current... :(
Why so fail?
Here is a schematic...
Zener and UF4007 removed. Could get more power by removing the limiting ignition coil, but I have only 1 555 timer, so I could also replace MOSFET for a better one like IRFP250n or even IRF640n... tried 250n, but it was a lower voltage arc....
I've seen a 555 on 30v 4a and it was very good power, I want higher voltage, not current, I'm also using the flyback's internal primary, which seems to give more power.
Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
I know how the circuit works.
13VDC to - and + to 555 input, and 45vdc + to vcc+ on the output end of the driver, and - of 45vdc to - of the 555 input...
I think I'm doing it right, maybe I'm wrong?
Ever since I removed the TVS, the circuit is just bad... on 19vdc I could get very big arcs and with 45vdc input big arcs but not as big as 19vdc input when I got the driver...
So what's wrong, is there anything in the circuit that needs replacing because Sulaiman, did use this circuit on 12vdc 1a...
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
disconnect your 45v supply, reconnect your 19v supply and tell me how well the 19v circuit works...do you still get the High energy output like before?
Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
19vdc is terrible, it shuts off as it pulls to much current. MOSFET needs a fan...
Sorry about this schematic, but this is how I power the circuit.
Instead of 19vdc I'm using 45vdc for more power, the 19vdc is a laptop SMPS, 19v 4a.
The 45vdc is a CB radio supply, I modified, for just the transformer and bridge and smoothing caps, and it output 45vdc and 20a shortcircuit, then the voltage drops to 25v...
Thanks for helping.
If I take out the ignition coil, then I'll probably blow it up.
Maybe an IRFP250N would be better...
Before I used 5v for the 555, but the gate threshhold is 10v I think, so now I use 13v to turn the gate on all the way.
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.