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.
hi all im new here and to electronics and im having trouble understanding how to make the optical trigger system. i have some flash units from cameras and some optical gate circuits, well i just cant get the optic to fire, i m not sure if iv made it wrong but all i want is for the projectile to break the beam and trigger the flash unit
can anyone help me , iv added a pic of what i have so far i just need to get help on how to get the optical trigger to work the flash unit
Registered Member #511
Joined: Sat Feb 10 2007, 11:36AM
Location: Somerset UK
Posts: 55
It looks like you are trying to use the 2n2222 in the emitter follower configuration. You should take the lower end of the 10K resistor to ground and then take the output from the emitter to the SCR gate via a current limiting resistor. The SCR gate will be pulled up to 2 or 3 volts when the transistor is "on" you can then calculate the value of resistor you need to get a sensible current.
hi ozzy thanks for the info but unfortunatly in have no idea what you mean, like i said i dont know much or anything about electronics really, so i need really simple instructions.
i also dont see how a scr can work as a switch?????
Registered Member #546
Joined: Fri Feb 23 2007, 11:43PM
Location: Albuquerque, NM
Posts: 239
To trouble shoot things of this nature you really do have to have a basic understanding on electronics...at least the terminology / vocabulary. Of course it's a chicken and egg thing... this IS a good starter project.
I'd also suggest you get a basic book on electronics and theory. I learned the most early on from a simple little radio shack electronics project book.... and later studying for my amature license... and now from these guys :)
Point is, doing it from a kit (or pre-tested design) can only really teach you so much - books are great for the rest. most people here are happy to help one another, but you have to speak the secret code :P
ANYWAYS.... back on track....
This thread should give you some better insight to optical triggers:
Ozzy - I've built this circuit - it works, but you have to really adjust that pot to get the power low enough on the PT to be sensitive enough to trigger... the problem is there's too much leakage of light around the projectile, so you're not fully cutting the path, hence no trigger...
Andy: If you cover (or disconnect) the LED does the circuit trigger? Also, try making a little hood over each of the optical components with tape or heat shrink tube, to limit the angle of each part, and line them up....
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.
first multi stage gun
