| 摘要 |
PURPOSE:To both educate culture of sentiments and ensure safety, by suspending a musical sound through a melody performance switch if an alarm switch is pressed to both generate an alarm sound from a speaker and turn on a lamp. CONSTITUTION:If an alarm switch SW2is pressed, a lamp L is turned on while an unstable multivibrator circuit D is oscillated, and its frequency drives a speaker SP to generate an alarm sound of about 2.5KHz. At this time, If a melody is performed, the other end of the switch SW2 is connected to a performance stopping pin No.14 in a melody memory integrated circuit A, and the performance is suspended. Then if a melody performing switch SW1 is pressed, a pulse is applied to a pin No.5, 6 to perform a melody, if the switch SW1 is again pressed after the melody performance is finished, the next program of music is performed. In this way, musical education and culture of sentiments can be performed further attention can be called without causing the uncomfrotableness for a pedestrian and other running cycles. |
