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Rail Gun

Discussion in 'General Electronics Discussion' started by Pyromaniac1, Jan 23, 2014.

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  1. Pyromaniac1

    Pyromaniac1

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    Jan 23, 2014
    I am building a rail gun. I plan on using 3 400v 2200uf capacitors in series. Any suggestions on a supplier?
     
  2. GreenGiant

    GreenGiant

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    Feb 9, 2012
    Digikey? Mouser?
    Should be a fairly common value.
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,418
    2,788
    Jan 21, 2010
    Look for capacitors with the highest ripple current rating you can.

    Even better, look for capacitors designed to be used with xenon flash as they are designed to handle the huge discharge currents.
     
  4. Pyromaniac1

    Pyromaniac1

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    Jan 23, 2014
    Thanks. That was pretty helpful. Were kind of on a budget though. Do you think we could still get substantial power from 350 v capacitors, or only two 400 v capacitors?
     
  5. Pyromaniac1

    Pyromaniac1

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    Jan 23, 2014
    What kind of speed should the projectile be going when it enters the barrel to avoid spontaneous welding.
     
  6. Pyromaniac1

    Pyromaniac1

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    Jan 23, 2014
    How many 250 v 400 uf capacitors would i need to equal the power output of three 400 v 22000 uf.

    Please give me any input you have so I don't melt my face off.
     
  7. jcurrie

    jcurrie

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    Feb 22, 2011
    divide 22000 by 400. they will still have a 250volt rating though.
    jc
     
  8. duke37

    duke37

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    Jan 9, 2011
    The energy in a capacitor is C * V^2/2.
    3 * 400 *400 * 22000E-6 /2 = 5280J

    N * 250 *250 * 400E-6 /2 = 5280J
    N = 5280 *2 /250/250/ 400E-6 = 422.4 say 420

    This is all rather simplistic and the efficacy of the capacitors will depend on the resistances and inductances of the circuit.
     
  9. jcurrie

    jcurrie

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    Feb 22, 2011
    Duke is correct I was thinking of farad not power.
    jc
     
  10. Pyromaniac1

    Pyromaniac1

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    Jan 23, 2014
    Thanks guys. Fingers crossed I will not blow up my middle school.
     
  11. eKretz

    eKretz

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    Apr 8, 2013
    Don't say that...the NSA will send the black helicopters!
     
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