220V交流電源另一路經定時插座加到充電器，當充電器還未轉入浮充充電狀態時，充電器的紅燈LED1得電發光，LED1兩端的2V電壓經插頭P1、插孔J1、電阻R2加到VT3基極，VT3飽和導通，將2.1V穩壓調整管VT4基極短路到地，穩壓調整管VT4截止，石英小鬧鐘無直流電源供給而不工作，當充電器轉入涓電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流浮(fu)充充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)階段時(shi)，充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)器紅色(se)二極管(guan)(guan)LED1兩端變為零電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓熄滅(充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)器綠(lv)色(se)二極管(guan)(guan)則(ze)發光)，此時(shi)VT3也因基極零電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓而截止，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源調整(zheng)管(guan)(guan)VT4正常導(dao)(dao)通，輸出2.1V直(zhi)流電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源，石英小鬧鐘得電(dian)(dian)(dian)(dian)(dian)(dian)(dian)開始(shi)計時(shi)，當(dang)計時(shi)到預先設定值時(shi)，石英小鬧鐘輸出低電(dian)(dian)(dian)(dian)(dian)(dian)(dian)平音(yin)(yin)頻(pin)脈沖(chong)訊響信號，該(gai)低電(dian)(dian)(dian)(dian)(dian)(dian)(dian)平音(yin)(yin)頻(pin)脈沖(chong)信號通過VT2放大整(zheng)流經(jing)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容C5濾波輸出一(yi)直(zhi)流電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓，使VT1飽和導(dao)(dao)通，開關S1電(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)脫鉤線圈得電(dian)(dian)(dian)(dian)(dian)(dian)(dian)產生磁(ci)力(li)，使開關按鈕脫鉤跳開，斷開交(jiao)流電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源，從而實現自(zi)動結束充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)。

   智(zhi)能定(ding)時(shi)(shi)插座的(de)電(dian)(dian)(dian)路(lu)(lu)見圖，共由交(jiao)流(liu)(liu)電(dian)(dian)(dian)源(yuan)(yuan)(yuan)開關(guan)、電(dian)(dian)(dian)磁脫鉤線(xian)圈驅動(dong)電(dian)(dian)(dian)路(lu)(lu)、定(ding)時(shi)(shi)電(dian)(dian)(dian)路(lu)(lu)、直(zhi)流(liu)(liu)電(dian)(dian)(dian)源(yuan)(yuan)(yuan)電(dian)(dian)(dian)路(lu)(lu)4部分組成。將該電(dian)(dian)(dian)路(lu)(lu)插上電(dian)(dian)(dian)源(yuan)(yuan)(yuan)插頭，按(an)(an)下交(jiao)流(liu)(liu)電(dian)(dian)(dian)源(yuan)(yuan)(yuan)開關(guan)S1按(an)(an)鈕，接通(tong)220V交(jiao)流(liu)(liu)電(dian)(dian)(dian)源(yuan)(yuan)(yuan)即可開始(shi)工作。220V交(jiao)流(liu)(liu)電(dian)(dian)(dian)源(yuan)(yuan)(yuan)一(yi)路(lu)(lu)經(jing)14V電(dian)(dian)(dian)源(yuan)(yuan)(yuan)變(bian)壓(ya)器(qi)T降壓(ya)、橋式整流(liu)(liu)電(dian)(dian)(dian)路(lu)(lu)整流(liu)(liu)、濾波(bo)電(dian)(dian)(dian)容(rong)C1濾波(bo)、三端穩(wen)(wen)壓(ya)集成電(dian)(dian)(dian)路(lu)(lu)IC1穩(wen)(wen)壓(ya)、濾波(bo)電(dian)(dian)(dian)容(rong)C2濾波(bo)產生穩(wen)(wen)定(ding)的(de)+12V直(zhi)流(liu)(liu)電(dian)(dian)(dian)源(yuan)(yuan)(yuan)，該+12V分三路(lu)(lu)輸(shu)出：(1)經(jing)R4加(jia)(jia)到LED2作+12V直(zhi)流(liu)(liu)電(dian)(dian)(dian)源(yuan)(yuan)(yuan)工作指示。(2)經(jing)R3、VD2、LED3串(chuan)聯穩(wen)(wen)壓(ya)后(hou)經(jing)C3濾波(bo)加(jia)(jia)到穩(wen)(wen)壓(ya)調(diao)整管(guan)VT4基極(ji)，使(shi)VT4將+12V穩(wen)(wen)壓(ya)為2.1V，由VT4發射極(ji)輸(shu)出，該2.1V經(jing)C4濾波(bo)后(hou)加(jia)(jia)到石(shi)英(ying)小(xiao)鬧鐘(zhong)電(dian)(dian)(dian)源(yuan)(yuan)(yuan)正負極(ji)為其(qi)提(ti)供直(zhi)流(liu)(liu)電(dian)(dian)(dian)源(yuan)(yuan)(yuan)(提(ti)示一(yi)點(dian)：2.1V高(gao)了些，石(shi)英(ying)小(xiao)鬧鐘(zhong)走時(shi)(shi)稍(shao)快(kuai)一(yi)些，定(ding)時(shi)(shi)值(zhi)按(an)(an)4~5小(xiao)時(shi)(shi)即可)。(3)加(jia)(jia)到開關(guan)S1的(de)電(dian)(dian)(dian)磁脫鉤線(xian)圈上。

　　元件選擇
　　元(yuan)件選(xuan)(xuan)擇(ze)如(ru)電(dian)(dian)(dian)路原理圖(tu)上(shang)的標注：VT1、VT3、VT4選(xuan)(xuan)用(yong)(yong)(yong)(yong)S8050型(xing)三(san)極管，VT2選(xuan)(xuan)用(yong)(yong)(yong)(yong)S8550型(xing)三(san)極管，IC1選(xuan)(xuan)用(yong)(yong)(yong)(yong)LM7812，VD1選(xuan)(xuan)用(yong)(yong)(yong)(yong)IN4148型(xing)二(er)(er)極管，VD2～D6選(xuan)(xuan)用(yong)(yong)(yong)(yong)IN4007型(xing)二(er)(er)極管，LED1、LED2選(xuan)(xuan)用(yong)(yong)(yong)(yong)普(pu)(pu)通(tong)(tong)紅色(se)發光二(er)(er)極管，LED3選(xuan)(xuan)用(yong)(yong)(yong)(yong)普(pu)(pu)通(tong)(tong)綠色(se)發光二(er)(er)極管，R1選(xuan)(xuan)用(yong)(yong)(yong)(yong)2kΩ普(pu)(pu)通(tong)(tong)電(dian)(dian)(dian)阻，R2選(xuan)(xuan)用(yong)(yong)(yong)(yong)10kΩ普(pu)(pu)通(tong)(tong)電(dian)(dian)(dian)阻，R3、R4選(xuan)(xuan)用(yong)(yong)(yong)(yong)1kΩ普(pu)(pu)通(tong)(tong)電(dian)(dian)(dian)阻，開關S1選(xuan)(xuan)用(yong)(yong)(yong)(yong)KDC-A01-06Y型(xing)的，P1和(he)J1分別選(xuan)(xuan)用(yong)(yong)(yong)(yong)普(pu)(pu)通(tong)(tong)單(dan)聲道耳機插(cha)頭、插(cha)孔(kong)。變(bian)壓器(qi)T選(xuan)(xuan)用(yong)(yong)(yong)(yong)3W/14V電(dian)(dian)(dian)源變(bian)壓器(qi)，C1選(xuan)(xuan)用(yong)(yong)(yong)(yong)1000μF/25V電(dian)(dian)(dian)解電(dian)(dian)(dian)容，C2、C3、C4選(xuan)(xuan)470μF/25V電(dian)(dian)(dian)解電(dian)(dian)(dian)容，C5選(xuan)(xuan)用(yong)(yong)(yong)(yong)47μF/25V電(dian)(dian)(dian)解電(dian)(dian)(dian)容。