OPTO ESC Doubt

#1

Hi,
I want to start experimenting with the px4 SDK, but before, one of the fundamental steps is the assembly of a UAV. In this regard, however, I have some doubts caused by my inexperience, and I apologize for the trivial message.
I state that I have a Pixhawk 3 PRO as a flight controller. My doubt is about the powering of the ESCs. I have OPTO ESCs, obviously without BEC. How should I give power to my receiver? A 6S battery powers my PDB. My receiver is a FrSky X8R. Do I have to purchase six BECs with as many batteries to power the BECs, which power the receiver or can I in some way take the voltage from the flight controller itself to power the receiver?

I apologize for the trivial message, and I thank everyone.

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