In this video we take a look at the differences between analog and digital servos.
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If I were to grab a bunch of digital and analog servos, ripped the labels off and asked for you to hand me only the digital servo's, it would be very challenging. The reason is, there really isn't a difference between digital and analog servos on the outside. In fact, there really isn't much of a difference on the inside either. Both types of servos contain the same gear train, same 3 wire lead to the Rx, brushed motor, case, and even potentiometer to determine the servos position!
The large difference between the types of servos is in the circuit board. We explain this in more detail during the video as well as listing out the advantages and disadvantages of each.
Is it ok if my digital servo makes noise when there is no control input or external forces acting on the servo? The quick answer to this question is yes. It is quite normal for a digital servo to sing to you. The reason for this is because of the high frequency pulses that get sent to the motor within the servo. You are in fact hearing these high frequency pulses that the motor is receiving. Listen in near the end of the video to hear this.
