| 摘要 |
PURPOSE: To prevent useless consumption of a battery by interrupting all power supplies, including the power supply for a timer circuit itself, after a prescribed time passes. CONSTITUTION: When an engine is stopped, timer IC 2 measures a time set beforehand. During this time, each sort of load circuit 14 can be used unless a power switch 12 is turned off intentionally. Since a transistor T1 connected to an excitation coil 3a of a relay 3 turns off when the prescribed time passes, the relay 3 turns off also in linkage thereto, a contact 3b is opened and a power circuit is interrupted. Thereby a power supply to the load circuit 14 is interrupted, while the power supply to the timer IC 2 itself is also interrupted. Therefore useless consumption of a battery can be prevented. |
