【文章內(nèi)容簡(jiǎn)介】 以我們選100大電容,并選四個(gè)10KΩ電阻起保護(hù)作用。 自鎖電路的選擇選一個(gè)開關(guān)控制CP的電位,用四個(gè)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(shí)序控制電路的選擇選四個(gè)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(hào)型號(hào)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(cè)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(shí)，其余的仍為0，對(duì)應(yīng)的第一個(gè)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(shí)電容開始放電)。蜂鳴器響，其中的第一個(gè)到達(dá)者對(duì)應(yīng)的發(fā)光二極管亮。而對(duì)隨后到來(lái)的其他信號(hào)不再作出反應(yīng)。 單元電路檢測(cè)觀察選手搶答時(shí)鎖存器輸出是否控制其時(shí)鐘脈沖的通斷，從而判斷是否自鎖了其他選手的搶答信號(hào)。搶答信號(hào)到BCD碼的轉(zhuǎn)化可將轉(zhuǎn)化邏輯的輸出與真值表對(duì)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(hào)、計(jì)時(shí)器到零控制，可分別檢測(cè)。 系統(tǒng)連調(diào)給整個(gè)系統(tǒng)上電，主持人給開始信號(hào)，對(duì)選手給搶答和沒有搶答分別進(jìn)行測(cè)試，觀察定時(shí)顯示和搶答顯示的顯示結(jié)果。附錄A圖A1 觸摸延時(shí)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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