CD4017计数器的输出与CD4066模拟开关的接通状态即发光二极管LED的点亮情况由附表所示。当CD4017的Q7端为“1”时,计数器复位。随着555集成电路IC1的振荡信号不断产生,附表中所列现象循环出现,发光二极管发出的7种色彩(单色或三基色合成色)也循环不断,并且每种光色的点亮过程会有一种类似烟花闪烁后迅速熄灭的感觉。
三极管T1、T2、T3都是由RC微分电路驱动的,如果将三极管T1改为RC积分电路(R与C在电路中 的位置互换)驱动则可使红LED在点燃时间上有一个后延,如此当两个以上LED都点亮时就会产生时序上的差异,产生动画般的层次感。
另一路模拟燃放礼花的声音由时基集成电路555IC2来完成,该电路同样也是一个振荡器,不过,其复位端4脚所接的电位器是由IC1输出的方波信号经过R1和C1组成的微分电路后产生的即从方波上升沿起及之后的一段时间内,IC2的4脚才能保持高电平“1”,并使其工作,所产生的振荡信号直接驱动扬声器和三极管驱动的LED点亮同步,发出类似礼花爆炸的声响。
倍德立(厦门)科技有限公司
销售经理:张卫东 联系电话:13055237500 座机:0592-6085900 QQ:3454941352
销售经理:杨帆 联系电话:13358371730 座机:0592-6085900 QQ: 2921696645
销售经理:叶工 联系电话:15359890861 座机:0592-6087118 QQ: 2650907184
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