1. n0825，STK630三极管用什么代替？

STK630三极管最大电流9A，最大电流200V。可以用STK0825或IRF630三极管代替。

三极管，全称应为半导体三极管，也称双极型晶体管、晶体三极管，是一种控制电流的半导体器件·其作用是把微弱信号放大成幅度值较大的电信号， 也用作无触点开关。晶体三极管，是半导体基本元器件之一，具有电流放大作用，是电子电路的核心元件。三极管是在一块半导体基片上制作两个相距很近的PN结，两个PN结把整块半导体分成三部分，中间部分是基区，两侧部分是发射区和集电区，排列方式有PNP和NPN两种。

2. 有什么办法可以看到各地卫视和央视？

类似的问题我已经回答过很多次了，这一次再给大家加深一下印象。不拉网线不接有线电视完全可以免费看电视，时下正在流行可用的主要有两种途径:一，安装定位型户户通卫星天线；二，安装地面波天线。

户户通卫星天线:头几年比较靠谱的户户通卫星天线就是插卡定位型户户通卫星天线，这种卫星天线在初次安装时要开户，机顶盒后面必须插入正在使用的有流量的电话卡来定位，信号质量要调到百分之五十越多了越好，这样就可以收看到所有的电视频道了。这种卫星天线一共收看63个台左右，包括中央台十七个一个不拉，还有全国各地省台及直辖市电视台，而且画质清楚全部免费观看，解决了人们看电视难的问题。

下面链接中为你精心挑选了一款户户通、地面波信号线，能确保你安装成功

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现在，户户通卫星天线又出现了北斗定位型户户通卫星天线，这种卫星天线能够收看二十多个高清频道，共收看91个频道，只不过这种卫星天线在安装时比较麻烦。

地面波天线:自20209月1日以后，模拟信号电视频道就无法观看电视了，只能通过其他途径观看电视。地面波天线就是观看电视的另一种重要途径。因为这种地面波天线虽然收台不是很多，只能收看二三十个台，但是作为农村老百姓已经完全满足需要了。这种地面波天线可以收看中央1台、中央11台、、中央4台等央视台，还能收看部分当地台（例如我这里可以收看山东台好几个、莱芜台、齐鲁台等），这是卫星天线所不能办到的，而且这种天线价格不高在100元左右，都是免费使用不用花钱的，特别适合普通老百姓使用。

下面链接中为你挑选了一款数字高清地面波天线，这种地面波天线安装简单收台稳定，值得购买。

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普通天线:这种天线就是原来使用的那种收台不多的三环形天线或者其他样式的模拟信号接收天线（不论多高档）。但这种天线只适合现在液晶智能电视机，原来的那种CRT老是式彩电则无法使用。将这种天线与电视机连接好，然后用全自动搜索频道，就可以收看到电视频道了，当然通过这样的方法收台，依然是收台不多，顶多收看到四五个台，都是免费观看的，但这种接收电视频道的方法往往信号不稳定，有时直接看不到台，只适合老年人观看。

通过上面的介绍我们知道了，不拉网线不接有线电视也是能够免费观看电视的，最可靠的方法是安装户户通卫星天线或者是地面波天线，这两种方法都能解决广大群众观看电视难的问题。

好了，今天的回答就到这了，希望我的回答能够帮助到大家，更多电器互联网科普类的知识，请关注蓝翔学子科普，谢谢！