I'm having a problem powering the Sabertooth and the RC reciever.  In the book, it says to connect the to the 5V on the Arduino, but that does not appear to be enough power.  Is this a common problem or am I doing something wrong?

Currently, I have all 6 outputs from the RC reciver plus the Sabertooth drawing from that one source.  There was no close up of the actual electronic layout in the book, so I don't know if that was the intention.