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What is a Digital Servo? What is an Analog Servo?

In a digital servo, incoming signals are processed and converted into servo movement. These signals are received by a microprocessor. The length and amount of power of the pulse is then adjusted to the servo motor. Through this, optimum servo performance and precision can be achieved.

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As mentioned above, digital servo sends these pulses at a much higher frequency which is 300 cycles per second. With these rapid signals, the response of the servo is pretty quick. The increase in the motor’s speed; eliminates the deadband. The digital servo provides a smooth movement with higher power consumption.

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What is an Analog Servo?This a standard type of servo motor. In an analog servo, the speed of the motor is controlled by applying on and off voltage signal or pulses. The regular pulse voltage range is between 4.8 to 6.0 volts and this is constant.

For every second the analog servo receives 50 pulses and there is no voltage sent to the servo when on rest.

If you have an analog servo, you will be able to notice that the servo lags in reacting to small commands and cannot get the motor spinning fast enough. A sluggish torque is also formed in an analog servo, in other terms this is also called deadband.

Now that you have an idea about what is an analog and digital servo, you can decide for yourself that which servo motor will you prefer for your car.

Servo SizeWeight RangeTypical Servo WidthTypical Servo LengthTypical Applications 
NanoLess than 8g7.5mm18.5mmMicro airplanes, indoor airplanes, and micro helicopters
Sub-Micro8g to 16g11.5mm24mm1400mm wingspan and smaller airplanes, small EDF jets, and 200 to 450 size helicopters
Micro17g to 26g13mm29mm1400 to 2000mm wingspan airplanes, medium and large EDF jets, and 500 sizes helicopters
Mini27g to 39g17mm32.5mm600 size helicopters
Standard40g to 79g20mm38mm2000mm wingspan and larger airplanes, turbine powered jets, and 700 to 800 size helicopters
Large80g and larger>20mm>38mmGiant scale airplanes and jets
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What are the different RC Servo Sizes?By now you have an overall idea about RC cars and that they come in different models and sizes. Just like this, the servos of RC cars have a variety of sizes and they are categorized into six standard sizes. In the table below you can see all the sizes with their specifications.

Article Source: https://www.dspowerservo.com/news/what-is-a-digital-servo/

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