Hey everyone. I am a total noob to electronics, so I would really appreciate your help on my first engineering project! I am building an RC Excavator and need help with the circuits for the linear actuators I plan to build. I have 3 DC motors on the way with a voltage range from 6-12V. I have lead screws and lead nuts on the way as well. I will leave the rest of the mechanics out of this and get straight down to my problem. I need to be able to control 6v-12v DC 3 motors separately. They need to be able to spin in both directions and at speeds controlled by the operator. I have a DX6I and a 6 channel receiver I was hoping to incorporate into this build but it seems the receivers are only good up to 9v. If their is a work around for this please let me know! I have been reading a little bit about Pulse Width Modulation and it seems to be the way to go with electric motors. Now for the next challenge. When the nut reaches the end of its travel, I would like for it to hit a switch that turns off the ability for the motor to spin in that direction anymore. This will make it so the nut won't be able to spin off screw. In other words, after the motor has spun clockwise for a determined distance, a limit switch will be hit. When that switch is activated, the motor will no longer be able to spin clockwise, and the only way to get it to spin clockwise again is for you to tell it to spin counter-clockwise until the switch is no longer activated. I know this is a lot to ask, and would greatly appreciate any help! Thanks!