Hugo:

Read down. I used a novak 4700mp capacitor. I tried a smaller cap, but it didn't work. you could get one from radio shack I am sure. Just get something aroudn 5000mp at 10v. That should do it.

You can plug it into the batter slot on the receiver, or I would say the 3rd channel as I believe the power connections in the receiver are common, but don't quote me on that....