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.
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.
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 Size | Weight Range | Typical Servo Width | Typical Servo Length | Typical Applications |
| Nano | Less than 8g | 7.5mm | 18.5mm | Micro airplanes, indoor airplanes, and micro helicopters |
| Sub-Micro | 8g to 16g | 11.5mm | 24mm | 1400mm wingspan and smaller airplanes, small EDF jets, and 200 to 450 size helicopters |
| Micro | 17g to 26g | 13mm | 29mm | 1400 to 2000mm wingspan airplanes, medium and large EDF jets, and 500 sizes helicopters |
| Mini | 27g to 39g | 17mm | 32.5mm | 600 size helicopters |
| Standard | 40g to 79g | 20mm | 38mm | 2000mm wingspan and larger airplanes, turbine powered jets, and 700 to 800 size helicopters |
| Large | 80g and larger | >20mm | >38mm | Giant scale airplanes and jets |
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.
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