The author has devised a new method to differentiate or integrate a-c input signal in a special a-c amplifier employing no particular demodulator. The derivative or integral action is generated by feeding to a capacitor-resistor network the half-wave voltage proportional to the a-c input and by applying various positive or negative feedbacks to the amplifier. Being so simple, stable and flexible, the circuit is expected to have a wide variety of effects in application.

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The use of the automatic voltage regulator is to keep the generator terminal voltage within a certain range independent of normal load conditions. The existing control systems have many disadvantages in the maintenance aspects, because they are composed of fragile contacts, complicated mechanical moving parts, delicate electronic tubes, etc. From these points of view, the magnetic amplifier controlled systems have recently been developed into a higher condition and their excellent results are reported today. This paper describes the operating principle and the performance data about one of these systems. When controlled by this device, the deviation of the generator terminal voltage is maintained steady and guranteed within 1.0% despite of any load condition.

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