[BP-Revo]

Well, typically you have RX power input into the receiver, and then your servos plug into the receiver and the receiver passes power through to the servos and also takes a little bit of power for itself to run.

If you put too much voltage into the receiver you fry it.

If your servo can take 12V but your receiver can take only 6v, you can feed a 6v input to the receiver and a 12V source to the servo directly, hooking up the servo's signal wire to the receiver.