In common: 1 RPM = 1 Hz. Very simple, KISS rule in work 🙂
Blue: HobbyWing Sensor, voltage 3.3V (powered from CGY750 unit, small LDO, current less than 100 mA).
Yellow: YGE 120HV, voltage 5V (powered internally, seems important, Vamp is not voltage from BEC as I expected), pull-down resistor seems enough. Pin – Brown=Ground, Red=Signal, Yellow=i-have-no-idea-what-is-it, frequency is about 72 Hz, not changes with RPM, voltage or any else, very stable, this wire always shorted on ground in my setup:
ISDS205B have very nice Sweep mode of DDS – it’s fast enough (1 step in 10 ms), i can use RPM simulation and check some things with proactive govs in Futaba on the table without actual run, very nice feature!
That’s all, folks 😉