| 摘要 |
PURPOSE:To obtain a timer which can be operated easily, by setting the time of a timer by means of the number of times by which the switch has been pushed. CONSTITUTION:Whenever the switch 30 is operated, the binary counter 22 counts up, at the same time the flip-flop 25 is reset, and the oscillator 17 starts its oscillation. The binary counter 21 counts up at every one minute, it is compared with the count value of the binary counter 22, which has been counted previously by operating the switch, and in case of coincidence, an output of the comparator 23 is made ''1''. As a result, the oscillator 17 stops its operation, and the sounding body 29 is driven through the alarm signal compounding gate 26. |
