Citizen Watch Company, Ltd.

Kabushiki Kaisha Daini Seikosha

New Japan Radio Co., Ltd.

Shozo Ochiai

Kojiro Tanaka

Hideki Noda

Tomio Okigami

AC driver having three power supply voltages including an internally

A voltage detecting circuit, for example for detecting the approaching exhaustion of the battery of a timepiece, hand-held calculator or other small electronic device uses a MOS transistor, the operating point of which in detecting the predetermined voltage is selected as the point at which the ratio of the current to the conductive constant of the MOS transistor is above 0.1. The temperature compensation thereby achieved is good enough that the measured value almost coincides with the design value without the need of using a variable resistor.

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Tokyo, Japan

Shozo Ochiai