| 摘要 |
PURPOSE:To make long-time photographing for a portable video camera and a cine camera etc. stable, by providing a means informing the life of batteries. CONSTITUTION:An output of a down counter for video camera is inputted to an output of a switching circuit 5 together with an output of a clock counter 3. Taking the capacity of a battery for a video deck as one hour, data of 1hr 00min 00sec is written in the counter 4 in advance. When th start/stop of photographing is repeated, the content of the counter 4 is sequentially down-counted and when it reaches 0hr 00min 00sec, the output is inputted to an alarm generating circuit 9 to inform that the photographing time elapses by one hour, with alarm. |
