Is it necessary to connect the 12V servo bus ground to Cube Orange MAIN OUT ground if both are already powered from the same Mauch Power-Cube?
I’m using a Mauch Power-Cube 3 on a fixed wing:
- 5.3V output → Cube Orange POWER1
- 12V output → external servo power bus
- servo PWM signals → Cube Orange MAIN OUT
The servos get +12V and GND from the Mauch 12V output, and only the PWM signal comes from the Cube MAIN OUT.
My question: since the Mauch already makes the 12V output ground and POWER1 ground common, is it still useful/recommended to connect the external servo bus GND to the Cube MAIN OUT GND?
I understand the two grounds are already common from a DC continuity point of view. I’m asking specifically about PWM signal reference / return path.
Could adding the MAIN OUT GND connection to the servo improve signal integrity, or could it create an unwanted return path for servo current through the carrier board?