Hobby Servo:
Hobby servos - feedback-controlled motors which move an output shaft to a specified position. Internally they use a potentiometer to measure actual position. The internal circuit compares the actual and commanded position and generates positive and negative motor current pulses to operate a tiny gearmotor. Modular controlled physical motion.
PWM dictates duration approximately 1-2 ms repeated at approximately 50 Hz.
EAGLE Schematic:
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