【文章內(nèi)容簡介】 以我們選100大電容,并選四個10KΩ電阻起保護(hù)作用。 自鎖電路的選擇選一個開關(guān)控制CP的電位,用四個三極管封鎖電路。 振蕩電路的選擇CC4011為與非門,它的電壓范圍為315V,輸入電壓為0V。 時序控制電路的選擇選四個1KΩ的小電阻作為發(fā)光二極管的限流電阻。 元件表 四路搶答器元件表元件名稱符號型號數(shù)量電阻R1~R4,R910K5四D鎖存器CC40421電容C1101電容C21電阻R5~R81K4電阻R10100K1電阻R1168K1二極管VD1~VD44發(fā)光二極管VL1~VL44四2輸入與非門CC40111開關(guān)SB,SB1~SB45蜂鳴器HTD1 組裝與調(diào)試 按電路圖接線連接好電路，電源電壓+5V, POL與GND連接，所以CP=0有效。當(dāng)按下SB,芯片復(fù)位，測得：開關(guān)連接4042芯片的輸入端—與地之間的電壓為0V，4042的輸出端—端的電壓為0V，CP電壓為0，兩端電壓為0V，右側(cè)結(jié)點(diǎn)與地電壓為0V，=(的輸出端為負(fù)，的輸入端為正)，蜂鳴器兩端電壓為0V。當(dāng)搶答時，其余的仍為0，對應(yīng)的第一個到達(dá)者的輸出端Qx電壓=，其余的仍為0，兩端電壓仍為0，=(此時電容開始放電)。蜂鳴器響，其中的第一個到達(dá)者對應(yīng)的發(fā)光二極管亮。而對隨后到來的其他信號不再作出反應(yīng)。 單元電路檢測觀察選手搶答時鎖存器輸出是否控制其時鐘脈沖的通斷，從而判斷是否自鎖了其他選手的搶答信號。搶答信號到BCD碼的轉(zhuǎn)化可將轉(zhuǎn)化邏輯的輸出與真值表對照檢查，看設(shè)計(jì)是否正確。揚(yáng)聲器受主持人開始、搶答信號、計(jì)時器到零控制，可分別檢測。 系統(tǒng)連調(diào)給整個系統(tǒng)上電，主持人給開始信號，對選手給搶答和沒有搶答分別進(jìn)行測試，觀察定時顯示和搶答顯示的顯示結(jié)果。附錄A圖A1 觸摸延時開關(guān)原理圖附錄B圖B1 聲控閃光電路原理圖附錄C圖C1 彩燈循環(huán)顯示電路原理圖附錄D圖D1 四路搶答器電路原理圖附錄E圖E1 四路搶答器PCB圖附錄F圖F1 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