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src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;"><p>該<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電話"><em>電話</em></a>回?fù)芷鞑捎?a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/單片機(jī)"><em>單片機(jī)</em></a>控制，具有電路簡(jiǎn)單、接觸可靠、使用方便等優(yōu)點(diǎn)。</p>本文引用地址：<a href="http://www.ex-cimer.com/article/172216.htm">http://www.ex-cimer.com/article/172216.htm</a><p>　　一、工作原理</p><p>　　電路見(jiàn)附圖所示，系統(tǒng)由摘機(jī)，掛機(jī)電路、<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/單片機(jī)"><em>單片機(jī)</em></a>撥號(hào)控制電路、DTMF號(hào)碼產(chǎn)生及放大電路、電源電路等四部分組成，下面分別予以介紹</p><p>　　1.摘機(jī)/掛機(jī)電路</p><p>　　圖中，J1為<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電話"><em>電話</em></a>線進(jìn)線插座，J2為該裝置所并聯(lián)的<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電話"><em>電話</em></a>機(jī)插座，Rl為保險(xiǎn)電阻;DI—D4為極性保護(hù)電路，用于將線路上極性不確定的電壓轉(zhuǎn)換成極性固定的電壓，保證無(wú)論電話線的正負(fù)極如何連接，都能使進(jìn)入開(kāi)關(guān)管VI發(fā)射極的一端始終是正電壓;V1是電子開(kāi)關(guān)，該開(kāi)關(guān)的通、斷受<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/單片機(jī)"><em>單片機(jī)</em></a>P3.7口控制，當(dāng)P3.7為高電平時(shí).V2、VI相繼導(dǎo)通，電話線路上的48V電壓通過(guò)VI加到R5兩端，電話線上有電流通過(guò)，此時(shí)處于摘機(jī)狀態(tài);當(dāng)P3.7為低電平時(shí).V2、VI截止.電話線上沒(méi)有電流通過(guò)，此時(shí)處于掛機(jī)狀態(tài)。在摘機(jī)狀態(tài)，由電話機(jī)房送出的48V供電電壓大部分由電話線的線路電阻衰減.R5兩端產(chǎn)生的電壓降大約在5V~15V之問(wèn)。</p><p>　　2.單片機(jī)撥號(hào)控制電路</p><p>　　<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/89C2051"><em>89C2051</em></a>完成對(duì)撥號(hào)芯片的控制，R8、c5為復(fù)位元件，完成上電復(fù)位，JTI為6MHz晶振。</p><p>　　用Pl口的8根線完成對(duì)撥號(hào)芯片的控制。</p><p>　　3.DTMF號(hào)碼產(chǎn)生及放大電路</p><p>　　使用MK5087型DTMF撥號(hào)專用芯片。該芯片原本是行列式按鍵輸入芯片，即4條行線及4條列線組成16個(gè)按鍵，實(shí)踐證明，該芯片不但具有行列式鍵盤(pán)輸入，而且與51系列單片機(jī)具有良好的接口性能。下面對(duì)該芯片各引腳的功能予以介紹。</p><p>　　第(1)腳：電源正極，工作電壓范圍為3.5V—10V。(2)腳：狀態(tài)輸出端，當(dāng)芯片發(fā)出DTMF信號(hào)時(shí).該腳呈低電平，否則呈高電平。(3)、(4)、(5)、(9)腳：鍵盤(pán)列線輸入端，內(nèi)接下拉電阻，高電平有效，當(dāng)該腳與任一行線連接，或者一條行線與一條列線同時(shí)有效時(shí)，此時(shí)芯片發(fā)出DTMF信號(hào)。</p><p>　　(6)腳：電源負(fù)極。(7)、(8)腳：振蕩輸入、輸出端，接3.58MHz晶體。(10)腳：該腳與第(2)腳正好相反，當(dāng)芯片發(fā)出DTMF信號(hào)時(shí)，該腳呈高電平，否則呈低電平。(11)、(12)、(13)、(14)腳：鍵盤(pán)行線輸入端，內(nèi)接上拉電阻，低電平有效，當(dāng)該腳與任一列線連接，或者一條行線與一條列線同時(shí)有效時(shí)，芯片發(fā)出DTMF信號(hào)。(15)腳：?jiǎn)我羰欠裼行Э刂贫?，?nèi)接上拉電阻，當(dāng)該腳接地時(shí)，芯片只能發(fā)</p><p>　　出雙音頻，而不能發(fā)出單音頻：當(dāng)該腳接高電平或懸空時(shí)，芯片既允許發(fā)出單音，又允許發(fā)出雙音，只有在行線和列線不同時(shí)有效的情況下，芯片才能發(fā)出單音頻信號(hào)。(16)腳：DTMF信號(hào)輸出端：(16)腳發(fā)出的DTMF信號(hào)經(jīng)V3放大后，從V3集電極送入到線路中。</p><p>　　該芯片行列鍵盤(pán)與DTMF號(hào)碼為對(duì)應(yīng)關(guān)系，當(dāng)某一按鍵按下時(shí)，相當(dāng)于該按鍵的行線R為低電平、列線C為高電平;同樣，當(dāng)某一行線R為低電平、列線C為高電平時(shí)，等效于該行線與該列線交叉的按鍵被按下。</p><p>　　4.電源電路</p><p>　　電源電路中，220V交流電壓經(jīng)變壓器B變?yōu)?V.然后經(jīng)D5~D8整流，CI、C2濾波，再經(jīng)ICl(7805)穩(wěn)壓.C3、C4濾波后輸出穩(wěn)定的Sv電壓，供單片機(jī)及號(hào)碼產(chǎn)生電路使用。</p><p>　　采用外加交流電源供電的優(yōu)點(diǎn)是：當(dāng)電話線路過(guò)長(zhǎng)(比如大干20km甚至更多).如果電話線上的電壓因?yàn)榫€路過(guò)長(zhǎng)衰耗太大，以致于到了終端，電壓降不能維持終端設(shè)備工作甚至為零的情況下，該系統(tǒng)仍然能夠正常工作。</p><p>　　二、<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/制作"><em>制作</em></a>安裝</p><p>　　所有元件安裝在50mmx80mm的板上。板上有8個(gè)螺絲孔，兩個(gè)用于將變壓器固定在線路板上，一個(gè)用于固定7805，其余5個(gè)用于將線路板和機(jī)殼固定。電話進(jìn)線插座和出線插座安裝在機(jī)殼上，并通過(guò)連線與板上的JI和J2桿|連。指示燈LED在線路板上設(shè)計(jì)有安裝位置，也可根據(jù)外觀的設(shè)計(jì)需要將指示燈引出。J3為220V電雎輸入端.J4用于和機(jī)殼上的開(kāi)關(guān)K連接。為便于改寫(xiě)程序，單片機(jī)IC2不直接焊接在板上，而是通過(guò)IC插座插入，這樣改寫(xiě)程序時(shí)，可直接將單片機(jī)從板子上拿下來(lái)。需要指出的是，由于R5產(chǎn)生的功耗較大，一定要用功率為IW或2W的水泥電阻.Rl要用不大干51Ω的保險(xiǎn)電阻。變壓器用2W的即可，其他元件沒(méi)有特殊要求。</p><p style="text-align: center"><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" alt="用89C2051單片機(jī)制作的電話回?fù)芷? src="http://editerupload.eepw.com.cn/fetch/20130926/172216_1_0.jpg" style="width: 527px; height: 371px" /></span>  <div class="jfcgkty" id="coverDiv" class="article_reg" style="width:100%;overflow:hidden;display:none;z-index:10;position:absolute;left:0;background:#fff;"> <center> <img 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