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
In airsoft you use normally use 8.6v 1000-4000Mah batteries, I've seen a webpage that you can use capacitors, if you use a 8.6v 1600mah battery it normally lasts you a short game in airsoft.
What I want to ask is, are caps better than batteries? in size and performance and how long they last? I don't know the calculations.
Also MOSFET's are being used to reduce trigger response. Although I don't know how, it lowers arcing at the switch contacts. How would install the FET?
Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
8.6V 1000mAH is roughly 31,000 joules. To store that in a cap at 8.6V you would need 838 F, assuming you could still extract energy as the cap voltage dropped to zero. Not practical. The energy density of batteries still far exceeds capacitors, and they have a much friendlier discharge curve.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
"Capacitor banks are used to fill in the extra power needed to power your aeg. Think of it as a battery on steroids, As the motor turns, only 50% of the time is it pulling the spring due to the sector gear pulling the piston and releasing it, as the motor pulls the piston it uses more power than when it is not pulling the spring so therefore a capacitor bank aids the motor by supplying it with more power.
You do not need one with a high powered (good) lipo battery as the battery can handle the motors draw."
Sounds like he's using it to try to boost a knackered battery.
I've seen an ad in Popular Science where they use "ultracapacitors" to power a computer mouse. It seems like an interesting concept, and I think it would catch on because of the less toxic materials needed to make it, and the frequency you would need to dispose of them would be less. Personally, I think ultracaps would be useful for low current things. As far as high current things, I'll leave it to physicists to find an effective dielectric :P
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
Capacitors (including ultracaps) can be excellent power sources for high-current loads at low duty cycles. Typically they are recharged before every shot. Ultracap banks are used in some electric-hybrid city buses.
The airsoft guy is using his caps in parallel with a rechargeable battery. Like the "boostcaps" people use with stupidly powerful audio amps in cars. I bet it -does- give an obvious improvement in motor performance, but engineers and scientists would want to see measurement results.
Registered Member #2405
Joined: Fri Oct 02 2009, 12:59AM
Location: Wisconsin
Posts: 140
Actually capacitors have been used as batteries. If you have ever seen those shake charge flashlites that were once so popular they actually used a coil and a magnet, a fullwave bridge and a capacitor. When you shake it the lose magnet was allowed to slide in an out of the coil, the coil output was connected to a full bridge the full bridge fed the caps the caps inturn would discharge through bulb or led which ever type you had, however the efficiencies are obsurdly low. But it did work.
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.
Capacitors instead of batteries?
