Hi,
I was wondering if anyone here has any good suggestions for foam insulation for high altitude balloons. We're looking at temperatures as low as -60 deg. Any recommendations on supplier as well?
A possible solution is using a L293D.
It's pretty much an H-bridge in an IC. You can checkout these links to get examples and wiring solutions.
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1262265918
http://www.wiring.org.co/learning/topics/steppermotor.html
http://segwii.com/hardware.html
I know your going for a rail gun, but consider other possibilities as well. A rail gun does require a lot of current, as mentioned above, but is doable. A really cool project that get's people excited is the Jumping Ring which is really the Lenz Effect. It's not to difficult to explain to...