350v 47000uF Capacitor or equivelant

[Steve101]

Thanks
Trying to replicate Dafmans circuit
htp://uk.youtube.com/watch?v=t3q6mCraI-c

and then apply it to a different motor setup, I'm sure he describes a capacitor of 350v 47000uF.
Unfortunately these are a lot more expensive than I thought.
Not sure why he needs 350 v when the circuit is only 12v,  thought they were off the shelf but will look for something different here.

Cheers
all.

[agentgates]

try to get in touch with these guys:
http://www.powerlabs.org/railgun.htm
http://www.powerlabs.org/images/newcaps.jpg

or this company:
http://www.gaep.com/capacitors.html

[Overmind]

Be aware that a lot of so-called high capacitance capacitors are actually made of internal batteries so they won't be usable as the true capacitors are in various applications.

[innovation_station]

steeve 101

i have 4 caps i will sell ...  3 of them  20 000 uf 50vdc max

and i have 1 2500mfd 350vdc

if your intrested make an offer

there large grey caps and 1 blue one 2.5" across 6 " tall

w

blue one is a mallory and other 3 are mepco electra

i would use the 350 volt to remove .. to allow for high speed and use the other 3 as output ...

hope this helps