Application of switching transistors and saturable reactors in a high-performance servo

THE PURPOSE of this paper is to demonstrate that the performance of instrument servos can be improved by the exclusive use of magnetic devices and transistors to perform the functions of amplification, modulation, and demodulation. Substitution of solid-state devices for electronic amplifiers and mechanical choppers not only increases the efficiency, the reliability, and the durability of the system but also minimizes its size and weight.