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Forums
4hv.org :: Forums :: Electromagnetic Projectile Accelerators
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capacitors

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phil
Wed Aug 09 2006, 08:39PM Print
phil Registered Member #314 Joined: Mon Mar 13 2006, 03:12AM
Location:
Posts: 52
Hi guys, it's been a while since i last posted. My summer has basicly consisted of work, and then comeing home to work on some robotics projects for the FIRST competition next year. But i recently salvaged an old PC power supply from one of my computers (RIP server # 4) and i noticed that there are 2 200V 470uF capacitors and some transformers in there. I was originally going to turn it into a lab power supply but before i do i wanted to ask you guys. would those capacitors be good for a Coil launcher? I'm still quite a novice with electromagnetic particle accelerators so please forgive me if that was a stupid question.
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Bjørn
Wed Aug 09 2006, 08:54PM
Bjørn Registered Member #27 Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
They are good for making a first coil gun and for learning. You have about 20 J of energy and you can at most expect to have 10% efficiency, then you can figure out how fast your projectile will move with an optimal design.
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phil
Wed Aug 09 2006, 08:57PM
phil Registered Member #314 Joined: Mon Mar 13 2006, 03:12AM
Location:
Posts: 52
Thank you, guess i'll have to buy a lap supply after all cheesey
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Wilson
Thu Aug 10 2006, 02:47AM
Wilson Registered Member #78 Joined: Thu Feb 09 2006, 11:27AM
Location: Sydney, Australia
Posts: 133
You can also find similar caps in practically all common electronics, eg TVs, laser printers, monitors, etc.
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phil
Thu Aug 10 2006, 03:05AM
phil Registered Member #314 Joined: Mon Mar 13 2006, 03:12AM
Location:
Posts: 52
Hmmm, i think i have an old CRT lying in the basement, i should give that a try.
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Electroholic
Thu Aug 10 2006, 08:09AM
Electroholic Registered Member #191 Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
yea you should be able to find 1 or 2 lytics, around 220uf to 330uf at 400v
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phil
Fri Aug 11 2006, 02:53AM
phil Registered Member #314 Joined: Mon Mar 13 2006, 03:12AM
Location:
Posts: 52
I also noticed a few transistor looking things. Is there a way of telling whether their a SCR?
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...
Fri Aug 11 2006, 03:01AM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
The transistor looking things are transistors (98% sure) To tell what a given part is, type the numbers into the search box at alldatasheet.com and see what turns up.

If you need some scr's I would be happy to send you a few (free in us, or $5 global) pm me.
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IamSmooth
Thu Sept 28 2006, 01:16AM
IamSmooth Registered Member #190 Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
For a heavy duty coil gun where does one get a robust enough SCR? I have a 50A rms/600A peak SCR ( 511-BTW69-1200 ) from Mouser. What if I wanted a peak surge of over 1000A or more?
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Electroholic
Thu Sept 28 2006, 01:39AM
Electroholic Registered Member #191 Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
ebay?

I have a 50a stud with 1.5ka pulse rating.
its a 50ria120 or something like that.
i believe yours will do fine for a short pulse at 1ka.

I also got a few SKKT132/16Es 4.7ka pulse off ebay.
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