| 摘要 |
PURPOSE:To eliminate time deviation or trouble by touching with a finger by using twelve switches to signal hour and minute when a switch is operated only corresponding to the current time. CONSTITUTION:When a switch ST is depressed, the output is selected for 10min position or hour position of a counter CT with a selection circuit SE2 according to the output of a selection circuit SW and the output for the hour position is fed to a coincidence circuit CM2 while the output for the 10min position is fed to an alarm control circuit B. As switches H1-H12 are depressed sequentially, outputs are fed to the coincidence circuit CM2 with an encoder E. The current time is assumed to be 8:32. When the switch H8 is depressed, an output is produced from the coincidence circuit CM2, a coincidence tone is generated from an alarm AL and then, alarm tones are emitted three times at a terminal m10. When a switch SM is depressed, outputs for 1 and 5min positions of the counter CT are selected and an alarm tone for the 1min position is emitted twice. |
