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alternating current amplification factor amplitude angular anode armature automatic control automation and remote balancing binary bridge capacitance chapter characteristic choke circuit coefficient coil communication channel components conductors connected constant control winding core curve dead zone decrease depends device diagram differential diode direct current displacement distributor electrical electromagnetic electromechanical electronic amplifier equation error feedback ferromagnetic flux follower system frequency function grid harmonic response increase induction inertia input quantity instrument load magnetic amplifier measured quantity mechanical meter method motor null device number of pulses obtain operation operational amplifiers oscillations output quantity output voltage parameters phase photocell polar plot position potentiometer power supply receiver rectifier relay resistance resistor rotor Selsyn semiconductor shaft shown in Fig signal sinusoidal statism stator switch tachometer telecontrol telecontrol units telemetry temperature thermo-resistors thermocouple thyratron tion torque trans transducer transformer transistor transmitter triode usually variation velocity voltage stabilizer zero