I don't have the adaptor.
I was however involved with bobc on the design of the RAMPS-FD board, and the voltage trigger reason was why we use 74HC or 74AC parts elsewhere on the board (to go from 3.3V to 5V).
I was however involved with bobc on the design of the RAMPS-FD board, and the voltage trigger reason was why we use 74HC or 74AC parts elsewhere on the board (to go from 3.3V to 5V).