# OPTO ESC Doubt

**URL:** <https://discuss.px4.io/t/opto-esc-doubt/8572>\
**Category:** Pixhawk\
**Created:** [November 21, 2018, 10:34pm UTC](https://discuss.px4.io/t/opto-esc-doubt/8572 "2018-11-21T22:34:32Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![codabat](https://discuss.px4.io/letter_avatar_proxy/v4/letter/c/82dd89/32.png) [@codabat](https://discuss.px4.io/u/codabat)\
**Post date:** [November 21, 2018, 10:34pm UTC](https://discuss.px4.io/t/opto-esc-doubt/8572/1 "2018-11-21T22:34:33Z")

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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.