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        <title>电话机电路图</title>
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            <title><![CDATA[新型电话线路保护器电路图]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2020/202005071214401.html</link>
            <description><![CDATA[电话机的接线在T‘、R’两端，当有人盗用外线，BG1导通，T‘、R’间电压仅为2V，使盗打失败。盗打挂机后保护器自动复位。当用户通话时，按下K，若LED不亮，表示有窃听；若LED亮表示线路未被窃听。]]></description>
            <pubDate>Thu, 07 May 2020 17:11:34</pubDate>
            <category>电话机电路图</category>
            <author>mcu资讯</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2020/202005071214401.html</guid>
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            <title><![CDATA[用语音代替电话铃声的留言控制器]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2014/20140612345600.html</link>
            <description><![CDATA[该电话为用语言芯片ISD1016制作的用语音代替电话铃声留言控制器的原理电路图。该控制器可以存贮留言、音乐、一首歌或其他声响，以此替代单调的振铃声。]]></description>
            <pubDate>Thu, 12 Jun 2014 10:34:48</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2014/20140612345600.html</guid>
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            <title><![CDATA[TDA7010T+LM386调频对讲机电路图]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2014/20140428341235.html</link>
            <description><![CDATA[如图所示是TDA7010T+LM386组成的调频对讲机电路与制作，IC1采用 TDA7010T或TDA7050T，IC2采用LM386或BA5386，NJM386，IC3采用L7806，BG1选用9014；BG2选用 D－40或9018。电容器除电解电容器及C11外均采用瓷片电容器，C11采用CBM－226D可变电容器，如用7/25pF微调电容器也能覆盖整个波段，但应将C10短接，电阻均用金属膜电阻。线圈无需自制。天线用87～108MHz的专用橡皮套式天线。]]></description>
            <pubDate>Mon, 28 Apr 2014 10:01:27</pubDate>
            <category>电话机电路图</category>
            <author>天天向上</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2014/20140428341235.html</guid>
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            <title><![CDATA[给电话机巧设定时免打扰功能]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2012/20120720280970.html</link>
            <description><![CDATA[现在的电话机功能比较齐全，大都"具有来电显示、免提、暂停/重拨、定闹、回拨/追拨、lP拨号、铃声选择、计算器等诸多功能。]]></description>
            <pubDate>Fri, 20 Jul 2012 15:11:13</pubDate>
            <category>电话机电路图</category>
            <author>灰色天空</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2012/20120720280970.html</guid>
        </item><item>
            <title><![CDATA[话筒混音器电路]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2011/20111216255513.html</link>
            <description><![CDATA[话筒混音器电路信号混频器输入阻抗约为500kΩ，但它可以通过增加高R5，R8到10MΩ阻抗增加。]]></description>
            <pubDate>Fri, 16 Dec 2011 10:29:37</pubDate>
            <category>电话机电路图</category>
            <author>小兰</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2011/20111216255513.html</guid>
        </item><item>
            <title><![CDATA[10倍频扩音器电路]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2011/20111216255512.html</link>
            <description><![CDATA[10倍频扩音器电路中CD4046的设置，使VCO在10至100千赫工作。输出引脚（4）反馈到a÷10计数器。]]></description>
            <pubDate>Fri, 16 Dec 2011 10:26:53</pubDate>
            <category>电话机电路图</category>
            <author>小兰</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2011/20111216255512.html</guid>
        </item><item>
            <title><![CDATA[电话扩音器电路]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2011/20111215255425.html</link>
            <description><![CDATA[电话扩音器电路中UI-A为高增益反相电压放大器，通过L1电感耦合到电话线。]]></description>
            <pubDate>Thu, 15 Dec 2011 15:06:56</pubDate>
            <category>电话机电路图</category>
            <author>小兰</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2011/20111215255425.html</guid>
        </item><item>
            <title><![CDATA[采用PIC单片机控制的电话机电路]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2011/20111129253811.html</link>
            <description><![CDATA[本小总机以PIC单片机控制，使用简单，分机间可互相内线通话，最大优点是当供电停止时，各分机仍可打外线，且保持通话保密的功能。]]></description>
            <pubDate>Tue, 29 Nov 2011 11:03:02</pubDate>
            <category>电话机电路图</category>
            <author>叶子</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2011/20111129253811.html</guid>
        </item><item>
            <title><![CDATA[电话线路状态告知器电路图]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2011/20110916216281.html</link>
            <description><![CDATA[电话线路状态告知器电路如图所示。它是一种用来对电话线路的断路、短路等故障进行监视的装置，当出现上述情况时，该装置可自动发出声光信号告知故障发生。此外，若有人盗打电]]></description>
            <pubDate>Fri, 16 Sep 2011 09:47:46</pubDate>
            <category>电话机电路图</category>
            <author>叶子</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2011/20110916216281.html</guid>
        </item><item>
            <title><![CDATA[袖珍式电话机电路图]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2010/20100823222153.html</link>
            <description><![CDATA[
]]></description>
            <pubDate>Mon, 23 Aug 2010 20:09:07</pubDate>
            <category>电话机电路图</category>
            <author>nana</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2010/20100823222153.html</guid>
        </item><item>
            <title><![CDATA[简易对讲电话机电路图]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2010/20100823222152.html</link>
            <description><![CDATA[本文介绍的对讲电话机是采用清仓电话机座改装成的。本机使用效果良好，可作短距离通话设备，供工矿企业单]]></description>
            <pubDate>Mon, 23 Aug 2010 19:57:52</pubDate>
            <category>电话机电路图</category>
            <author>nana</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2010/20100823222152.html</guid>
        </item><item>
            <title><![CDATA[电话线路状态指示器]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2010/20100330213512.html</link>
            <description><![CDATA[电话线路状态指示器
当您家的电话线装了几个电话分机时,我想您需要这样一个指示电话线路状态的东西,那就是我们现在介绍的电话线路占线指示器]]></description>
            <pubDate>Tue, 30 Mar 2010 12:35:39</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2010/20100330213512.html</guid>
        </item><item>
            <title><![CDATA[工频0-5分钟延时电路]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2010/20100208163743.html</link>
            <description><![CDATA[工频0-5分钟延时电路
工频0~5分钟延时电路如下图所示，该电路采用双栅极场效应管RCA40841构成的可控硅触发电路，R的值决定延迟控制的持续时间，R等于60]]></description>
            <pubDate>Mon, 08 Feb 2010 18:05:40</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2010/20100208163743.html</guid>
        </item><item>
            <title><![CDATA[CD828/CD828A应用参考电路]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/20091228149083.html</link>
            <description><![CDATA[CD828/CD828A应用参考电路
]]></description>
            <pubDate>Mon, 28 Dec 2009 10:10:54</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/20091228149083.html</guid>
        </item><item>
            <title><![CDATA[全内置双线电话来电显示芯片电路图]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/20091228149073.html</link>
            <description><![CDATA[全内置双线电话来电显示芯片电路图
]]></description>
            <pubDate>Mon, 28 Dec 2009 10:09:11</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/20091228149073.html</guid>
        </item><item>
            <title><![CDATA[TCL电话机电路图(原理图)]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/20091121110755.html</link>
            <description><![CDATA[TCL电话机电路图(原理图)
]]></description>
            <pubDate>Sat, 21 Nov 2009 08:30:12</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/20091121110755.html</guid>
        </item><item>
            <title><![CDATA[步步高电话机原理图 (电路图)]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/20091121110754.html</link>
            <description><![CDATA[步步高电话机原理图
]]></description>
            <pubDate>Sat, 21 Nov 2009 08:27:53</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/20091121110754.html</guid>
        </item><item>
            <title><![CDATA[电话分线器电路]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/20091119109491.html</link>
            <description><![CDATA[电话分线器电路
]]></description>
            <pubDate>Thu, 19 Nov 2009 18:31:00</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/20091119109491.html</guid>
        </item><item>
            <title><![CDATA[无线免提电话装置电路]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/20091119109490.html</link>
            <description><![CDATA[无线免提电话装置电路
]]></description>
            <pubDate>Thu, 19 Nov 2009 18:29:26</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/20091119109490.html</guid>
        </item><item>
            <title><![CDATA[简易电话检修仪电路]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/20091119109487.html</link>
            <description><![CDATA[简易电话检修仪电路
]]></description>
            <pubDate>Thu, 19 Nov 2009 18:26:39</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/20091119109487.html</guid>
        </item><item>
            <title><![CDATA[单位内部电话交换机电路]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/20091119109477.html</link>
            <description><![CDATA[单位内部电话交换机电路
]]></description>
            <pubDate>Thu, 19 Nov 2009 18:07:40</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/20091119109477.html</guid>
        </item><item>
            <title><![CDATA[光藕组成的电话保安装置电路]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/20091119109474.html</link>
            <description><![CDATA[光藕组成的电话保安装置电路
]]></description>
            <pubDate>Thu, 19 Nov 2009 18:05:10</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/20091119109474.html</guid>
        </item><item>
            <title><![CDATA[电话占线指示器电路图]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/20091119109469.html</link>
            <description><![CDATA[电话占线指示器电路图
]]></description>
            <pubDate>Thu, 19 Nov 2009 17:59:27</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/20091119109469.html</guid>
        </item><item>
            <title><![CDATA[电话扩音录音装置电路及制作]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/20091119109466.html</link>
            <description><![CDATA[电话扩音录音装置电路及制作
]]></description>
            <pubDate>Thu, 19 Nov 2009 17:55:20</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/20091119109466.html</guid>
        </item><item>
            <title><![CDATA[电话机对讲电路]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/20091119109460.html</link>
            <description><![CDATA[电话机对讲电路
如图是外加元件最少的电话对讲电路。
]]></description>
            <pubDate>Thu, 19 Nov 2009 17:45:35</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/20091119109460.html</guid>
        </item><item>
            <title><![CDATA[电话机拨号电路]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/20091119109459.html</link>
            <description><![CDATA[电话机拨号电路
]]></description>
            <pubDate>Thu, 19 Nov 2009 17:43:47</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/20091119109459.html</guid>
        </item><item>
            <title><![CDATA[电话机维修参考电路]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/20091119109457.html</link>
            <description><![CDATA[电话机维修参考电路
点击电路图可以放大查看：
]]></description>
            <pubDate>Thu, 19 Nov 2009 17:42:18</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/20091119109457.html</guid>
        </item><item>
            <title><![CDATA[电话音量监控电路]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/20091119109451.html</link>
            <description><![CDATA[电话音量监控电路
]]></description>
            <pubDate>Thu, 19 Nov 2009 17:39:41</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/20091119109451.html</guid>
        </item><item>
            <title><![CDATA[电话远距离振铃电路]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/20091119109450.html</link>
            <description><![CDATA[电话远距离振铃电路
]]></description>
            <pubDate>Thu, 19 Nov 2009 17:39:01</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/20091119109450.html</guid>
        </item><item>
            <title><![CDATA[CD与VCD音频输出选通电路图]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/20091117107712.html</link>
            <description><![CDATA[CD与VCD音频输出选通电路图
用带daC的VCD解压板改装的CD机播放质量不高的CD片时，会有刺耳的噪声。本电路可自动转换，]]></description>
            <pubDate>Tue, 17 Nov 2009 22:34:54</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/20091117107712.html</guid>
        </item><item>
            <title><![CDATA[168服务电话加锁装置电路]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/20091117107709.html</link>
            <description><![CDATA[168服务电话加锁装置电路
本电路可限制电路168的呼出。电路以MT8870集成电路为核心，它将输入的双音频信号滤波后转换成对应的8421码]]></description>
            <pubDate>Tue, 17 Nov 2009 22:30:39</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/20091117107709.html</guid>
        </item><item>
            <title><![CDATA[光耦合电话防盗打器及电路图]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/20091117107523.html</link>
            <description><![CDATA[光耦合电话防盗打器及电路图
若你不在家中，当你的朋友打来电话时，该应答器会自动地将你的去处或联络电话告诉给你的朋友。该应答器安全可]]></description>
            <pubDate>Tue, 17 Nov 2009 16:03:13</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/20091117107523.html</guid>
        </item><item>
            <title><![CDATA[家用电器童锁开关电路]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/20091117107300.html</link>
            <description><![CDATA[家用电器童锁开关电路
CH220的工作电压为4-10V，它有5个输入端，其1，3，6脚为有效输入端，7脚为复位输入端。
]]></description>
            <pubDate>Tue, 17 Nov 2009 11:33:09</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/20091117107300.html</guid>
        </item><item>
            <title><![CDATA[红外线控制电话密码锁电路图]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/20091117107291.html</link>
            <description><![CDATA[红外线控制电话密码锁电路图
发射电路由VD4026-3及外围元件组成。R1的阻值决定IC内部振荡器的振荡频率，这里为100KHZ]]></description>
            <pubDate>Tue, 17 Nov 2009 11:27:38</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/20091117107291.html</guid>
        </item><item>
            <title><![CDATA[电话密码器电路图]]></title>
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            <description><![CDATA[电话密码器电路图:本双向电话密码器密码多达一万组，可任意设置。密码电路数码键由0-9组成，密码设四位，每位数字可以重复，图中设置为4269]]></description>
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            <author>佚名</author>
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            <title><![CDATA[电话线路测试仪]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/2009100995533.html</link>
            <description><![CDATA[电话线路测试仪

该]]></description>
            <pubDate>Fri, 09 Oct 2009 14:39:58</pubDate>
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            <title><![CDATA[电话电路]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/2009100995529.html</link>
            <description><![CDATA[电话电路

本电路通过向旧电话提供工作所需的]]></description>
            <pubDate>Fri, 09 Oct 2009 14:26:30</pubDate>
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            <author>佚名</author>
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            <title><![CDATA[电话保持电路]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/2009100995528.html</link>
            <description><![CDATA[电话保持电路

当按下S1时，SCR导通而将LED1和R1跨接到]]></description>
            <pubDate>Fri, 09 Oct 2009 14:23:20</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
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            <title><![CDATA[电话放大器]]></title>
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]]></description>
            <pubDate>Fri, 09 Oct 2009 14:19:05</pubDate>
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            <author>佚名</author>
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            <title><![CDATA[FCC PART68电话接口]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/2009100995525.html</link>
            <description><![CDATA[FCC PART68电话接口



用户在将任何电路接到]]></description>
            <pubDate>Fri, 09 Oct 2009 14:17:45</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/2009100995525.html</guid>
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            <title><![CDATA[来仿电话号码识别器]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/2009100995524.html</link>
            <description><![CDATA[来仿电话号码识别器

该来访]]></description>
            <pubDate>Fri, 09 Oct 2009 14:14:11</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
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            <title><![CDATA[电话音频接口]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/2009100995512.html</link>
            <description><![CDATA[电话音频接口

这个简单电路可通过]]></description>
            <pubDate>Fri, 09 Oct 2009 12:01:08</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/2009100995512.html</guid>
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            <title><![CDATA[报警拨号器]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/2009100995509.html</link>
            <description><![CDATA[报警拨号器
]]></description>
            <pubDate>Fri, 09 Oct 2009 11:57:06</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
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            <title><![CDATA[电话寻呼机(续)]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/2009100995508.html</link>
            <description><![CDATA[电话寻呼机(续)
这个寻呼机]]></description>
            <pubDate>Fri, 09 Oct 2009 11:54:16</pubDate>
            <category>电话机电路图</category>
            <author>佚名</author>
            <guid>https://www.elecfans.com/article/88/131/tel/2009/2009100995508.html</guid>
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            <title><![CDATA[5V拨号音电路]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/2009100995504.html</link>
            <description><![CDATA[5V拨号音电路
]]></description>
            <pubDate>Fri, 09 Oct 2009 11:47:01</pubDate>
            <category>电话机电路图</category>
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            <title><![CDATA[电话寻呼机]]></title>
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该寻呼机允许您将室内电话布线用作功率放大系统，电路用]]></description>
            <pubDate>Fri, 09 Oct 2009 11:45:21</pubDate>
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            <title><![CDATA[电话测频加密器]]></title>
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&nbsp;
&nbsp;
该电路适用两]]></description>
            <pubDate>Fri, 09 Oct 2009 11:40:34</pubDate>
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            <title><![CDATA[电话通话音提示电路]]></title>
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            <description><![CDATA[电话通话音提示电路

&nbsp;
本电路由两块廉价集成电路构]]></description>
            <pubDate>Fri, 09 Oct 2009 11:34:34</pubDate>
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            <author>佚名</author>
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            <title><![CDATA[扬声器电话适配器（续）]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/2009100995494.html</link>
            <description><![CDATA[扬声器电话适配器（续）
]]></description>
            <pubDate>Fri, 09 Oct 2009 11:27:59</pubDate>
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            <author>佚名</author>
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            <title><![CDATA[扬声器电话适配器]]></title>
            <link>https://www.elecfans.com/article/88/131/tel/2009/2009100995493.html</link>
            <description><![CDATA[扬声器电话适配器

这个]]></description>
            <pubDate>Fri, 09 Oct 2009 11:26:14</pubDate>
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