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One important note for ESCs that do not carry the “OPTO” label or are not TBS BULLETPROOF designs,
is that only one of the four ESCs should provide 5V BEC power to the flight controller. The middle red
wire on the end connector should be disconnected on three of the ESCs. If the flight controller is
providing power (e.g. NAZA-M PMU/V-SEN-unit), all ESC BECs should be disconnected. The reason for
this is to avoid voltage oscillations caused by erroneous voltage-regulator feedback.
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