The Spektrum adapter provides regulated 3.3V from unregulated (up to 15V) ESC/BEC power supplied via Servo headers to the board. Please remember that USB does not provide power to the FlexiPort or MainPort. | FlexiPort MainPort | Spektrum |
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GND | 1 - Black | 2 - Black | PWR | +5V to adapter | 1 - Orange (+3.3V) | TX | 3 - Blue | - | RX | 4 - Orange | 3 - Grey |
Schematic is pretty simple, you can made your adapter with a few components: Like here |