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I state that I have already modified the MAX 7219 by removing the diode d1 to make it work at precise 5v.
also I tell you that the displays the servos work with a separate 5 v power supply
the ground is connected al pin near pin 52 e the positive wiring is connected near pin 22.
I tell you that the displays the servos work with a separate 5 v power supply
if I use the knob on the overhead of the 737 the displays do not crash and work perfectly, while when I act on the encoders of the Arduino they sometimes work but most of the time they either turn off or show all 8.