【正文】 于擴(kuò)展電路設(shè)計(jì) ? 在指導(dǎo)書上給出了一個(gè)擴(kuò)展電路的參考電路圖，見附錄 2。w) z0C4F7IaMdP hSkVnZ q$t*x A1D5G 8KbNe QiTlW or%v(y+B3E 6H9Lc OgRjUmYp!samp。w)z1C4F7JaMdPhSkWnZq$u*xA2D5H8K bNfQiT lXos%v(y0B3E6I9L dOgRjVmYp!tamp。v)y0C3F6IaLdPgSjVnYq!t*wA1D4G8JbMeQhTlWoZ r%u(x+B2E6H9KcOf RiUmXp!samp。v)z0C3F7I aMdPgSkVnY q$t*x A1D5G 8JbNe QhTlWor%u(y+B2E6H9Lc OfRjUmXp!samp。w)z1C4F7JaMeP hSkWnZq$u*x+A2D5H8KbN fQiUlXos%v(y0B3F6I9LdOgRjVmYq!tamp。w)z0C4F7JaMdP hSkVnZq$u*xA 2D5G8KbNe QiTlXor%v(y+B3E6I 9LcOgRjUmYp!tamp。v) z0C3F7Ia MdPgSkVnYq$t*xA1D5G8JbNeQiTlWor%u(y+B2E6H9LcOfRjUmXp!samp。wz1C4G7JaMePhTkWnZr$u*x+ A2E5H8KcNf QiUlXps%v)y0B3F6I aLdOgSjVmYq!tamp。 ? 2. CD4017在本電路中主要產(chǎn)生秒十位的進(jìn)位脈沖，當(dāng)秒十位為 “ 6”時(shí)，通過其 Q6端輸出高電平脈沖，從而使秒十位計(jì)數(shù)器和秒個(gè)位計(jì)數(shù)器復(fù)位歸零，同時(shí)觸發(fā)分個(gè)位計(jì)數(shù)。而根據(jù)穩(wěn)壓電路的不同又可分為并聯(lián)型直流穩(wěn)壓電路和串聯(lián)型直流穩(wěn)壓電路以及開關(guān)型穩(wěn)壓電路。NE555技術(shù)資料表明：電源電壓為 5V時(shí)，外接電阻之和應(yīng)大于或等于 1kΩ ，小于或等于 。v) z0C3F7Ia MdPgSkVnYq$t*xA1D5G8JbNeQiT lWor %u(y+B3E6H9LcOfRjUmXp!samp。w)z1C4F7JaMePhSkWnZq$u*x+A2D 5H8KbNfQiUlXos% v(y0B3F6I9LdOgRjVmYq!tamp。wz1C4G7JbMePhTkWnZr$u(x+A 2E5H8KcNfRiUlXps%v)y0C3F6Ia LdOgSjVnYq! t*w z1D4G7JbMeQhT kWoZr$u(x+ B2E5H 9KcNf RiUmXpsamp。v)y0C3F7IaLdPgSjVnYq$t*w A1D4G 8JbNe QhTlW oZr%u(y+B2E 6H9Kc OfRjUmXp!samp。wz1C4G7JaMePhTkWnZr$u*x+ A2D5H 8KcNf QiUlXos%v)y0B3F6I dPhSkWnZq$u*xA2D5H8K bNfQiTlXos%v(y0B3E6I9L dOgRjVmYp!tamp。v) z0C3F7IaLdPgSkVnY q$t*wA1D5G8JbNeQhTlWor%u(y+B2E6H9LcOf RjUmXp!samp。v)y0C3F6IaLdPgSjVnYq!t*wz1D4G8JbMeQhTkWoZ r%u(x+ B2E5H 9KcOf RiUmXpsamp。w)z1C4F7JaMdPhSkWnZq$u*x A2D5H8KbNfQiTlXor%v(y0B3E6I9Lc OgRjVmYp!tamp。v)y0C3F7IaLdPgSjVnYq$t*wA1D 4G8JbN eQhTlWoZr% u(y+B2E6H9KcOfRjUmXp!samp。 掌握 LM317詳細(xì)的技術(shù)資料 本課題完整的數(shù)字電路設(shè)計(jì)方案 T R I G2OUT34C V O L T5T H O L D6D I S C H G781R E S E T V C CGNDU2 N E 5 5 5a1b15c14d13e12f3g2Q b o11Q c o10C P u9C P d7R5TE4LE6VDD16GND8U5 C D 4 0 1 1 0a1b15c14d13e12f3g2Q b o11Q c o10C P u9C P d7R5TE4LE6VDD16GND8U4 C D 4 0 1 1 0V D DV D DV D DC L K14C L K /E N13R E S E T15Q03Q12Q24Q37Q410Q51Q65Q76Q89Q911C o u t12V C C16GND8U3 C D 4 0 1 7 BC410UC5R347KR447Ka7b6c4d2e1f9g10dp5GND8GND3abfcgdedpX1S H U M A G U A Na7b6c4d2e1f9g10dp5GND8GND3abfcgdedpX2S H U M A G U A Na1b15c14d13e12f3g2Q b o11Q c o10C P u9C P d7R5TE4LE6VDD16GND8U8 C D 4 0 1 1 0a1b15c14d13e12f3g2Q b o11Q c o10C P u