This paper analyses designing problems of differential transformer which works connected with D. C. source. The D. C. power is converted into A. C. by a built-in oscillator and excites a primary winding. An A. C. output voltage of a secondary winding, which varies proportional to the displacement of an armature, is converted into D. C. by a built-in rectifying circuit and appears as D. C. voltage in the output terminal. One of the most important problems in study of D. C. differential transformer is a stability of rectifying circuit. This paper first analyses a half-wave rectifying circuit whose source impedance is a pure inductance and then extracts necessary desinging keys. Reported in detail are an oscillator whose output does not change as source voltage does, ambient temperature characteristics including its compensation circuits and integrated characteristics.

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This paper deals with the receiving system in which the transmitted signal of constant-current nature is compared with the reference current signal and current is balanced by the current input type servo amplifier and 2-phase servo motor. This system has such feature as its circuit construction is simple and economical in comparison with the potentiometric system. The servo amplfier is a directly-coupled two stage transistor amplifier with low input impedance, through which sufficient gain can be obtained with negligible zero drift. Since an accuracy of the receiver largely depends on the performance of reference current source, detailed description is made on its circuit. It is also described that electric current can be easily measured without opening the circuit, utilizing the deterioration of conductivity of Si diode at low voltage.

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