Welcome
Username or Email:

Password:


Missing Code




[ ]
[ ]
Online
  • Guests: 21
  • Members: 0
  • Newest Member: omjtest
  • Most ever online: 396
    Guests: 396, Members: 0 on 12 Jan : 12:51
Members Birthdays:
No birthdays today

Next birthdays
05/14 hvguy (41)
05/14 thehappyelectron (14)
05/14 Justin (2024)
Contact
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.
Forums
4hv.org :: Forums :: Electromagnetic Projectile Accelerators
« Previous topic | Next topic »   

Bulk photo flash caps

Move Thread LAN_403
Fnord
Sat Aug 24 2013, 04:53PM Print
Fnord Registered Member #2004 Joined: Sat Feb 28 2009, 11:43PM
Location:
Posts: 39
Been thinking about getting into some EM plinking again and found this person on ebay selling large lots of photo flash caps;

Link2

Opinions?

There are other listings (e.g. 500 for $85), which seems really cheap- even fair when considering cost per kJ.
I am aware of the 'capacitor plague' and am hesitant to buy anything from china, although they've slowly been modernizing in some areas. These are supposedly nippons but a quick look at nippon's catalog doesn't show any that are identical in specs.

Most of the guy's negative feedback is "item did not show up", which is probably expected when shipping from hongkong. Not many about product quality.

Anyone have bad experiences with crappy/fake ebay components? I've bought some counterfeit silicon before, though have not heard much regarding capacitors outside the exploding motherboard recalls a few years back.
Back to top
Thomas W
Sun Aug 25 2013, 03:18AM
Thomas W Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
While they are cheap per kJ, the problem is, the time taken to solder them, you could likely use that time to earn money for some really nice big capacitors like these:
Link2

Back to top
Yandersen
Sun Aug 25 2013, 05:08AM
Yandersen Registered Member #6944 Joined: Fri Sept 28 2012, 04:54PM
Location: Canada
Posts: 340
Aha. Used electrolytic cap. Nice way to spend money.
Back to top
Thomas W
Sun Aug 25 2013, 03:54PM
Thomas W Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
I find myself getting loads of new 'lytics off ebay and hamfests all the time (more or less sparkeling new with the screw capped with rubber)
Back to top
Fnord
Sun Aug 25 2013, 07:36PM
Fnord Registered Member #2004 Joined: Sat Feb 28 2009, 11:43PM
Location:
Posts: 39
__=|(:3)-|--{__ wrote ...

While they are cheap per kJ, the problem is, the time taken to solder them, you could likely use that time to earn money for some really nice big capacitors like these:
Link2



I already have around 4kJ worth of large (new) electrolytics, the purpose of these is making small banks of varying capacity.
Photo flash caps are also pulse-rated and usually lower ESR than the big ones.
Back to top

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob

Go to:

Powered by e107 Forum System
 
Legal Information
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.