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Forums
4hv.org :: Forums :: Electromagnetic Projectile Accelerators
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cheap capactors?

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haxor5354
Sun Oct 31 2010, 01:16AM Print
haxor5354 Registered Member #2063 Joined: Sat Apr 04 2009, 03:16PM
Location: Toronto
Posts: 352
anyone know where to get large electrolytic capacitor for cheap?
i saw some 9600uf 400v electrolytics for $15.00 each at a surplus store, is that a good buy?
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HazzWold 1993
Sun Oct 31 2010, 02:27AM
HazzWold 1993 Registered Member #2563 Joined: Mon Dec 21 2009, 10:17AM
Location: Australia
Posts: 280
Assuming they're in decent condition and work thats still 768 Joules per cap. so its not a bad price. just if they're old when you charge them the first time bring the voltage up slowly.
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Artikbot
Sun Oct 31 2010, 10:00AM
Artikbot Registered Member #3247 Joined: Mon Sept 27 2010, 09:42AM
Location: Spain
Posts: 137
Definitely yes! Just make sure they aren't perforated (previous owner -> suicide inventor? tongue), imho that price is a bit excessively cheap.

Like HazzWorld said, if they're old a slow charge will do to rebuild themselves.
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buzzer
Sun Oct 31 2010, 04:56PM
buzzer Registered Member #680 Joined: Fri May 04 2007, 03:20PM
Location:
Posts: 15
Are the used or new? They usually have a date code on them. Post the info on here and someone will be able to tell you the date of manufacture.
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haxor5354
Sun Oct 31 2010, 05:32PM
haxor5354 Registered Member #2063 Joined: Sat Apr 04 2009, 03:16PM
Location: Toronto
Posts: 352
they're prabably used, but the physical condition look very new. is there a way to test a capacitor?
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ScotchTapeLord
Sun Oct 31 2010, 05:42PM
ScotchTapeLord Registered Member #1875 Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
Measure it's capacitance with a meter to confirm its rated capacitance (obviously), charge it to confirm its insulation is good, let it sit charged for a bit (in a safe place where people won't touch it) to see how long it holds a charge to see if leakage is within reason.
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