| 摘要 |
PURPOSE:To enable simple control of an alarm while preventing malfunctioning, by performing the control of an alarm by tapping a timepiece while the sensitivity of a vibration sensor is adjusted according to the state of the alarm. CONSTITUTION:It is assumed that an alarm switch 7 is opened while the output Q of an FF circuit 3 is '0' before the sleeping. Here, to set an alarm, the upper front of a frame not illustrated is tapped once and an output is produced from a vibration sensor 1 and fed to an amplification circuit 2. Now, the sensitivity of the circuit 2 is set at the medium level by the output of a sensitivity adjusting circuit 10. With such an arrangement, an output is generated from the circuit 2 by tapping the timepiece at the medium degree of strength and a trigger is done by the FF circuit 3. As a result, one pulse is generated from a one-shot multivibrator circuit 8 and an alarm signal is passed from a gate circuit 6 to generate a set comfirmed tone from a sound generator 9. On the other hand, the circuit 2 is set for a low sensitivity with the circuit 10 by inverting the output of the circuit 3 thereby preventing malfunctioning. |
