Digital servo

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A digital servo is a servo that uses digital electronics rather than analogue electronics to control the servo output shaft position.

Unlike a conventional analogue servo, where the voltage applied to the motor varies roughly linearly with the error between the current servo position and the requested servo position, digital servos can apply full power even for very small errors between the commanded and current position.

Digital servo advantages include:

  • Smaller deadband;
  • Faster, more accurate response;
  • Greater torque.
  • Faster frame rate for more rapid updates.
  • "Short frame" capability on some servos for even faster updates.

Disadvantages include:

  • Use more power;
  • More expensive;
  • Sometimes require a stepdown regulator to reduce the supplied voltage to a safe 4.8V.

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