[Stuartambient]

Just want to clarify - I have linear bec on my esc, so the power to the rx from the CC3D is from the BEC.  Slightly  confused because the power off the power pin on the CC3D is unregulated but if it gets it's power from the BEC then I won't fry the RX.  This sound right?

[hwh]

Yes that sounds right, the power is not regulated by the CC3D before being passed on.   The BEC on the ESC normally puts out 5vdc regulated.  The CC3D takes that and regulates it down to the 3.3 volts it needs.  It passes it unchanged to it's other ports so the receiver is getting the 5vdc regulated by the ESC.  Other than the USB connector all the other CC3D power pins are just connected together.

[Stuartambient]

Ok, I freaked for a moment but then re-thought it Thank you for the reply.