by KWolter » Fri Feb 22, 2013 8:45 pm
Good information. I wanted to hack a FlySky module to my DX6i so I could use in with my little Syma X1 quadcopter but ran into the voltage issue. The DSM2 transmitter module in the DX6i requires 3.3v while the FlySky module has a 7805 regulator and needs an additional ~3v of headroom to reliably regulate. I'll probably replace the 7805 with a low-dropout equivalent to help conserve power or I might even see if I can get a ~6ish volt to 5v switcher for the FlySky module and another with 3.3v out to replace the 3.3 linear regulator in the DX6i box.
However, feeding the module with 8ish volts will allow me to swap in other modules, including the HK orange DSMX module.
The DX6i feeds out a 3.3v ppm signal and the FlySky module obviously was designed to see a 5v ppm signal. I may want a level shifter to do things right, though the 3.3v signal will theoretically work...