| 摘要 |
PURPOSE:To prevent a switch from malfunctioning by adding an AND circuit between the NOT output of a timer for generating an alarm and the output of the 2nd timer circuit. CONSTITUTION:The operation of a switch 1 is detected by a detecting circuit 2 and the 1st and the 2nd timer circuits 3 and 4 start operating in response to the detection output 12. The 1st timer circuit 3 clocks a specific time and an alarm circuit 5 is put in operation during the clocking operation. The 2nd timer circuit 4, on the other hand, clocks a constant time as far as the output 12 of the detecting circuit 2 turns on during the clocking operation. The NOT output 13 of the 1st timer circuit 3 and the output 15 of the 2nd timer circuit 4 are ANDed through the AND circuit 6, whose output 16 is sent out as the effective output of the switch operation. |
