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Registered Member #1924
Joined: Sun Jan 11 2009, 09:30PM
Location:
Posts: 12
Just wondering if you all can see any problems with this. I don't really know the L value, as I don't know the maximum amperage 3 6vs can put out. Thanks!
Basically, charge circuit and then I short it with the spdt (I know it is horrible compared to SCRS) and then 18A should flow through the core for RC...the better part of a millisecond..
That is the coil underneath Rs, which is the coil's resistance.
Registered Member #1316
Joined: Thu Feb 14 2008, 03:35AM
Location: Cambridge, MA
Posts: 365
I think 3 6vs means three 6volt batteries. Oh and 600uf seems a bit low for only 18 volts. You should use a higher voltage input voltage or get a bigger value capacitor. With the current diagram the projectile would most likely not move.
Registered Member #1924
Joined: Sun Jan 11 2009, 09:30PM
Location:
Posts: 12
Okay I'll hook it up to 75v or so tomorrow. I could get more energy out of that than increasing cap I guess. Thanks for the advice. I tried it with 18V via 9 volt batteries and the projectile didn't move at all.
Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
Your coil's resistance is one ohm? That's huge, especially at such a low voltage. If you want a coilgun to work at lower voltages, your coil needs to have a smaller number of turns of very thick wire.
Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
you need bigger capacitor's. 18v with 600uf is barely any. Find a onetime use flash camera, and rip that apart. Inside there is a charging circuit for 300v, and a good capacitor. Don't go more then 3 layer's.
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My first coilgun
