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Forums
4hv.org :: Forums :: Electromagnetic Projectile Accelerators
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Where to find Cheap or free salvagable capacitors for coilguns.

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ahron11
Sat Jul 05 2008, 03:16AM Print
ahron11 Registered Member #1572 Joined: Fri Jul 04 2008, 11:14PM
Location:
Posts: 19
 		Does anyone know of any places to find capacitors that are ideal in coilguns. Right now I am using some 450V 2400uf (12) that I got for 50$.
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Sulaiman
Sat Jul 05 2008, 01:44PM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
 		That's 2.9 kJoules !

How much more do you want ??
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Shaun
Sat Jul 05 2008, 02:30PM
Shaun Registered Member #690 Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
 		Yeah, I have that same set of capacitors, and I believe rp181 does too. They're great for coilguns, and should work nicely with one of those puck SCRs you mentioned.
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FastMHz
Sat Jul 05 2008, 05:40PM
FastMHz Registered Member #179 Joined: Thu Feb 16 2006, 02:08AM
Location: Hagerstown, Maryland - Close to Prime Outlets
Posts: 287
 		Auction sites are really your best bet.....though some hole-in-the-wall repair shops can yield the occasional find.
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Dr. SSTC
Mon Jul 07 2008, 02:20AM
Dr. SSTC Registered Member #1407 Joined: Fri Mar 21 2008, 07:09AM
Location:
Posts: 222
 		well if your planning to dump all that energy into a single coil dont even bother the effiecency wont ecen by 0.5% how ever if your planning a multi stage coil gun like 3 or 6 stages it would be great. the best capacitors i find to use in coil guns is photo flashe caps they are pulse rated,guaranteed for like 100,000 discharges without losing perfomance, release there energy faster and bascicly have larger power density levels.

I can tell you this form experience i have been testing my coil guns for years now and found they work the best i am now on my way to building a portablu hand held coil gun how ever i wont be using the ones from disposible cameras but im planning on buying some 300uf 450 volt cornell dublier photo falsh caps cheesey
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ahron11
Mon Jul 07 2008, 03:04PM
ahron11 Registered Member #1572 Joined: Fri Jul 04 2008, 11:14PM
Location:
Posts: 19
 		Yes I have been into coilguns for quite some time and I am planning to make a 4 or 5 stage coil gun with those capacitors.
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rp181
Tue Jul 08 2008, 12:57AM
rp181 Registered Member #1062 Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
 		Unfortunatley, i do not have those caps. Where did u get them? im still looking for capacitors for my rail/coil gun project.
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Arcstarter
Tue Jul 08 2008, 01:38AM
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
 		You could just buy a few of these: Link2
Link2
They each hold 300 joules (about) and you can series them up for like 5 of them for charging with an mot ir like 10 of them for an mot and doubler. Then you can just parallel them for even more energy.
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Shaun
Tue Jul 08 2008, 02:54AM
Shaun Registered Member #690 Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
 		Oh yea, sorry rp181. I mixed you up with another member. They are from BCD Parts on Ebay; I don't know if he's still selling them but I do remember he had THOUSANDS. They were being sold in lots of 12, 50, 100, and 200 IIRC.

Of course, maybe ahron11 doesn't have the same ones but that would be one hell of a coincidence.

They do work extremely well in coilguns. They appear to be kinda old but seem like quality inverter caps to me.

EDIT: oh and BTW i like the last sentence in the product description arcstarter linked to.
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ahron11
Sat Jul 12 2008, 05:39AM
ahron11 Registered Member #1572 Joined: Fri Jul 04 2008, 11:14PM
Location:
Posts: 19
 		That is the same place that I got my capacitors. haha. coincidence I guess.
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