用該電路制作裝置,由模擬禮花色彩的發光電路和模擬禮花爆炸聲的發聲電路兩個部分組成。圖中IC1為時基集成電路555,由它構成方波發生器,發出的方波振蕩信號分二路送出。一路送至十進制集成電路計數器IC3(CD4017)作為觸發信號,使其進行計數。每次計數的結果(CD4017的Q0∼Q6之一為“1”時),分別由二極管D1∼D12傳輸到相應的集成電雙向模擬開關CD4066的控制端,可使三個CD4066(1)、(2)、(3)或單獨或組合導通。這樣IC1的方波信號就可以通過模擬開關驅動相應的三極管T1∼T3飽和導通,點亮相應的發光二極管LED1∼LED3。
方波振蕩信號驅動三極管時,要先經過一個由電阻Rb和電容Cb組成的微分電路,根據微分電路的特點,後接的三極管是在方波上升沿開始後導通,然後Vb點的電壓按指數規律率減至0,因此三極管驅動的LED也有一個從突然點亮而漸暗的短暫過程,這個過程的長短可由Rb和Cb的數值(時間常數)來調整。
倍德立(廈門)科技有限公司
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