| 摘要 |
PURPOSE:To utilize the life of a battery to the maximum, thereof with an invariably secured alarm setting by checking for the voltage of a battery regularly at an interval of fixed time in the normal hand work. CONSTITUTION:An output of a quartz oscillation circuit 1 is diveded with a frequency circuit 2 and a motor M is driven with a drive circuit 3. In the normal hand work, as a setting switch 5 is opened, and alarm switch 6 is closed at an interval of a fixed time (12 or 24hr). An output of the switch 6 is fed to an AND circuit 7 and a one-shot pulse generation circuit 10. The circuit 10 generates a one-shot pulse signal to operate an alarm generator 9 through an OR circuit 8 and an alarm circuit 4, when the battery voltage V drops instantaneously due to a load current. A comparator circuit is provided to compare the voltage V dropped with a reference voltage V1 and indicates the life of the battery when V<V1. This allows the checking for the battery life at a fixed time interval. |
