| 摘要 |
PURPOSE:To enhance the cost performance and attain a good talking state, by applying the power supply to a slave station of a terminal device with a secondary battery which is charged by a solar battery and actuating only an IC operation amplifier at the terminal device side during a waiting time. CONSTITUTION:A master station B is connected to a slave station A via an optical fiber C, and a secondary battery 2 which is charged by a solar battery 1 is set at the station A. During a waiting time only an IC operation amplifier 5 is actuated by the battery 2. While in a calling time, a switch circuit 4 connected to the output side of the amplifier 5 is turned on with the signal code transmitted from the station B, and the voltage of the battery 2 is applied to a speaker 8 and a mike 7 of the station A. In such a way, a good talking state can be maintained with used of an optical fiber. |
