The design of automatic music player based on monolithic integrated circuit
Abstract
In order to facilitate people's daily life, optimizes schools’, institutions’ timing system, used has designed one kind of automatic music player which based on monolithic integrated circuit. This design fixed time and counts the function using monolithic integrated circuit 89C58RD+, completes the time the demonstration and fixed time the function. And, Through hypothesis starting value of timer, product the different frequency sound. Severs using the timer completesthe control of music metre length.Through LM386N1 audio power amplifier, enlarges signal which the monolithic integrated circuit outputs,then broadcast music from loudspeaker. Through MAX232 chip,can transform PC machine on the voltage and the monolithic integrated circuit supply voltage.And then,turns on the computer though String mouth,then it can download procedure which compiles with the C language to monolithic integrated circuit from computer.At last,it can demonstrates the time on the digital tube.When time to after fixed time, the loudspeaker automatically broadcasts section of continual musics. This design get rid of the traditional alarm clock’s grating sound, displaces is the wonderful music,can provides the accurate time for people's daily life.The design cost very inexpensive,it is worth promoting.
Key word：Monolithic integrated circuit; Automatic music broadcast; Audio frequency transformation; Time demonstration; LM386N1 audio power amplifier
