著者

宮内 鉄也 白江 公輔

出版者

公益社団法人 計測自動制御学会

雑誌

計測と制御 (ISSN:04534662)

巻号頁・発行日

vol.1, no.7, pp.545-553, 1962-07-10 (Released:2010-10-21)

---

Electronic control system requires a very reliable D. C. amplifier of high gain, high response and yet low noise. Magnetic modulator type D. C. amplifier is very reliable, but the amplifier of 100c/s carrier type does not satisfy all of the above requirements. Instead or 100c/s type, therefore, 1 000c/s type is employed. This D. C. amplifier consists of a 500 c/s oscillator, magnetic modulator, 1 000c/s tuned amplifier and power amplifier. The oscillator and amplifiers are transistorized. As a result of using the 1 000c/s carrier type, the following characteristics have been obtained:1) Gain: 8×104 (mA/mA)2) Cut off frequency: 20c/s3)Noise level: 5×10-16W (i.e.0.002μA)4) Ambient temperature: -10°C-+70°CAlso described are the applications of this D. C. amplifier to an electronic control system and electrical interference caused by A. C. power line.