CD4017計(jì)數(shù)器的輸出與CD4066模擬開(kāi)關(guān)的接通狀態(tài)即發(fā)光二極管LED的點(diǎn)亮情況由附表所示。當(dāng)CD4017的Q7端為“1”時(shí)，計(jì)數(shù)器復(fù)位。隨著555集成電路IC1的振蕩信號(hào)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(diǎn)亮過(guò)程會(huì)有一種類似煙花閃爍后迅速熄滅的感覺(jué)。

　　三極管T1、T2、T3都是由RC微分電路驅(qū)動(dòng)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(dòng)則可使紅LED在點(diǎn)燃時(shí)間上有一個(gè)后延，如此當(dāng)兩個(gè)以上LED都點(diǎn)亮?xí)r就會(huì)產(chǎn)生時(shí)序上的差異，產(chǎn)生動(dòng)畫(huà)般的層次感。

　　另一路模擬燃放禮花的聲音由時(shí)基集成電路555IC2來(lái)完成，該電路同樣也是一個(gè)振蕩器，不過(guò)，其復(fù)位端4腳所接的電位器是由IC1輸出的方波信號(hào)經(jīng)過(guò)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(shí)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(hào)直接驅(qū)動(dòng)揚(yáng)聲器和三極管驅(qū)動(dòng)的LED點(diǎn)亮同步，發(fā)出類似禮花爆炸的聲響。

倍德立（廈門(mén)）科技有限公司  

銷售經(jīng)理:張衛(wèi)東 聯(lián)系電話：13055237500 座機(jī)：0592-6085900  QQ:3454941352 

銷售經(jīng)理：楊帆 聯(lián)系電話：13358371730 座機(jī)：0592-6085900  QQ: 2921696645  

銷售經(jīng)理：葉工 聯(lián)系電話：15359890861 座機(jī)：0592-6087118  QQ: 2650907184  

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