PWM SIGNAL

Can I use one PWM signal to controller two servos simultaneously?

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If both servos has to do the same: yes.

In your case the object looks like an airplane so I’m not the right person to ask.

As said, yes, if you want the same command to both servos. However, each servo will respond a little differently, so you probably want to use two signals so that they can be calibrated to the individual servos.