第046章 图纸并非一切（2 / 2）
超级电信帝国
老井古柳
0 字
2021-04-05
苏鼎宇虽然很反感姜新圩用这些例子说明问题，但他还是明白了姜新圩的意思，说道：“是啊，如果测绘就能掌握别人的技术，测绘就能做出好的产品，那我们国家早就成了最发达的现代化国家了。” </p>
姜新圩笑了笑，说道：“你这家伙思想很落后啊。你这话不是说我们山寨太多了？” </p>
苏鼎宇第一次听说“山寨”这个词，但意思他还是明白，他懒得问对方是不是仿制的意思，而是继续问有关电话机的事：“你能不能说说今天两台电话机是怎么修理的。你不知道，我看到你就那么轻yì地剪下两个电阻就解决了故障，当时都懵了，你这家伙还是人吗？” </p>
姜新圩将筷子放下，说道：“说出来不值得一提。第一台电话机我将那个分压电阻剪下来，是因为那个电阻的质量不合格，其实际阻值与标称阻值相差太多，加上PCB上敷设的铜片厚薄不均，腐蚀加工电路板时又使那些腐蚀出来的电路太窄，导zhì电路的电阻值高。 </p>
虽然组装人员完全是按图纸组装的，但几个因素综合起来导zhì实际电阻值远远大于设计值和需求值，从而使芯片接脚处分配的电压值高于它所容许的数值，使芯片工作不稳dìng。 </p>
我用万用表量了以后，认为出掉这个电阻反而更好，完全可以将腐蚀出来的电路当电阻利用起来。 </p>
至于第二台电话机产生尖啸声的原因是因为电路产生了自激，那个电阻本来的作用是让芯片的那个接脚接地，让它的电压保持为零。可是，因为PCB质量差，腐蚀的铜片存zài较大的电阻，形成了电位差，导zhì这个电阻的输出脚把芯片泄漏的高频信号带到了旁边的震荡电路里。 </p>
事实上，这个芯片的接脚对电压并不敏感，为零不为零关系都不大，所以我就剪掉它。切断了高频信号的输出，尖啸声自然消失了。” </p>
虽然苏鼎宇不是技术员，但高中时学过物理，又在厂里卧底了一段时间，这种浅显的道理自然能听明白。听了姜新圩的解释，他很佩服地说道：“你真牛！竟然把问题想到PCB上，还一下找到尖啸声的来源。” </p>
…… </p>
吃完饭从酒店出来后，苏鼎宇先把摩托车送回自己住的地方，然后一起租了一辆三轮车前往长途汽车站，两人各奔东西：姜新圩回石桥镇的家、苏鼎宇回父母家。 </p>
今天前往邮电器材公司只能算是一道面试，回家之后的姜新圩面对家人时也没有做太多的解释，家里人同样不相信老天会突然掉馅饼下来，所以就连嘴巴多的小-妹也没有过多的询问，只是问他是不是真的放弃了对肖媛媛的恋爱，是不是真的喜欢上了那个姓冷的姑娘。不断追问着那个姓冷的姑娘到底是不是他的大学同学。 </p>
对于八卦心十足的小-妹，姜新圩很是无语。 </p>
手机用户请到m.阅读。</p>
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