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4hv.org :: Forums :: Electromagnetic Projectile Accelerators
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[moved] Very High Voltage Coil Gun

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Quantum Singularity
Wed May 14 2008, 02:56AM
Quantum Singularity Registered Member #158 Joined: Sun Feb 12 2006, 09:53PM
Location: Central Ohio
Posts: 282
I just used a NST, homemade HV bridge rectifier, and variac.
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Andyman
Wed May 14 2008, 10:06PM
Andyman Registered Member #1083 Joined: Mon Oct 29 2007, 06:16PM
Location: Upland, California
Posts: 256
It seems like a NST wouldn't have enough current to charge the caps quickly enough.
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Quantum Singularity
Thu May 15 2008, 12:50AM
Quantum Singularity Registered Member #158 Joined: Sun Feb 12 2006, 09:53PM
Location: Central Ohio
Posts: 282
Its been many years so I don't remember exactly, but it never took more than 1 minute for me to charge my 10kV 120uF cap, though I usually only charged it to 3-4kJ. I was once told that the caps need to be charged and discharged in less than 2 minutes so I always took that into consideration (but not sure if that was really true). Its possible if I used both my caps and wanted to charge them all the way to 12kJ 1 NST might not be enough, but I have 4 7500V 60mA ones that I was going to dedicate to a charger for the maxwells. Now for lower voltage and higher capacitance, yeah you might want more current, you'll have to run the numbers to see.
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