CD4017計數(shù)器的輸出與CD4066模擬開關(guān)的接通狀態(tài)即發(fā)光二極管LED的點亮情況由附表所示。當(dāng)CD4017的Q7端為“1”時,計數(shù)器復(fù)位。隨著555集成電路IC1的振蕩信號不斷產(chǎn)生,附表中所列現(xiàn)象循環(huán)出現(xiàn),發(fā)光二極管發(fā)出的7種色彩(單色或三基色合成色)也循環(huán)不斷,并且每種光色的點亮過程會有一種類似煙花閃爍后迅速熄滅的感覺。
三極管T1、T2、T3都是由RC微分電路驅(qū)動的,如果將三極管T1改為RC積分電路(R與C在電路中 的位置互換)驅(qū)動則可使紅LED在點燃時間上有一個后延,如此當(dāng)兩個以上LED都點亮?xí)r就會產(chǎn)生時序上的差異,產(chǎn)生動畫般的層次感。
另一路模擬燃放禮花的聲音由時基集成電路555IC2來完成,該電路同樣也是一個振蕩器,不過,其復(fù)位端4腳所接的電位器是由IC1輸出的方波信號經(jīng)過R1和C1組成的微分電路后產(chǎn)生的即從方波上升沿起及之后的一段時間內(nèi),IC2的4腳才能保持高電平“1”,并使其工作,所產(chǎn)生的振蕩信號直接驅(qū)動揚聲器和三極管驅(qū)動的LED點亮同步,發(fā)出類似禮花爆炸的聲響。
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