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Forums
4hv.org :: Forums :: Electromagnetic Projectile Accelerators
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Cheap capacitor - Is it greate for coilguns?

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DaMan
Sat Sept 29 2007, 05:22PM Print
DaMan Registered Member #1036 Joined: Sat Sept 29 2007, 05:18PM
Location:
Posts: 4
 		AA200
Price: $3.36
# 7.5H, 7.5 MFD 370V Motor Run Capacitor Single Capacitance
# Oval Shape
# Metal Can

Would such a capcitor be great for a coilgun? They say the size ranges from factory, as it may be 2-4 inches width/height.
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...
Sat Sept 29 2007, 05:42PM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
 		I think you would be a lot better off with electrolytic... For that price you could probably get 1000ufd if you looked for a while.

for reference, when they saw 7.5mfd they mean 7.5microfarad. Not millifarad as we all would hope wink
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DaMan
Sat Sept 29 2007, 05:45PM
DaMan Registered Member #1036 Joined: Sat Sept 29 2007, 05:18PM
Location:
Posts: 4
 		Thats a bummer, I might have to try on ebay or something. But can you point me out to the best capacitor that at least holds 330 volts? I say that because my circuit charges 330 volts so, :)

Ok, Hows a 2200 MDF 450V DC i think, 6 inch tall one? :D
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Bauerb2
Sat Sept 29 2007, 07:33PM
Bauerb2 Registered Member #973 Joined: Tue Aug 28 2007, 07:32PM
Location: Pittsburgh, PA
Posts: 66
 		Link2

i bought 4 of these from this same seller. they work fantastically. 3900uF @ 400V should be great, and they are cheap too. i use 2 of them charged to 215V and shot straight through a pop can. keep in mind they are used, but they work great.
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DaMan
Sun Sept 30 2007, 04:12AM
DaMan Registered Member #1036 Joined: Sat Sept 29 2007, 05:18PM
Location:
Posts: 4
 		Thats real nice. But er, WHAT ABOUT A MICROWAVE CAPACITOR :D

Microwave Oven High Voltage Capacitor .71uf 2100V

http://www.stevehv.4hv.org/MOCcrusher/can1.JPG Now that's cool, 18 MO caps in parallel
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Danielle
Sun Sept 30 2007, 05:16AM
Danielle Registered Member #632 Joined: Mon Apr 09 2007, 01:09AM
Location:
Posts: 267
 		I bought 12 2400uf 450V caps on ebay and they are in great condition for $29! I have alot of uses in mind for them.
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Bauerb2
Sun Sept 30 2007, 01:20PM
Bauerb2 Registered Member #973 Joined: Tue Aug 28 2007, 07:32PM
Location: Pittsburgh, PA
Posts: 66
 		thats a great deal for only $29 rocketry. i am amazed.

DaMan...as for using microwave caps, i suppose if you had gigantic bank of them, but in reality, i dont think you'll have enough capacitance to really do anything. i could be wrong though..... :D
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DaMan
Sun Sept 30 2007, 02:49PM
DaMan Registered Member #1036 Joined: Sat Sept 29 2007, 05:18PM
Location:
Posts: 4
 		I take 2100MFD is very bad too. That really sucks then! because these are 400VDC High Voltage Electrolytic Capacitors, 5.6 inches tall, 3.2 inches wide. and its 2100MFD? isn't anything in MFD like, bad?
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101111
Sun Sept 30 2007, 02:58PM
101111 Registered Member #575 Joined: Sun Mar 11 2007, 04:00AM
Location: Norway
Posts: 263
 		2100MFD is the same as 2100 microfarad/2100uF/2100µF.
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Shaun
Mon Oct 08 2007, 03:02AM
Shaun Registered Member #690 Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
 		Forget about microwave oven caps...voltage is too high and capacitance is too low. The pulse length would be so fast it would only be useful for launching projectiles the size of sand grains.

On the other hand, 2100uF/MFD 400V caps would make a great coilgun.
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