文档介绍：收音机实训报告
of rural drinking water sources, protection of drinking water sources in rural areas by the end of thcope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities- 5 -
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
、高频的统调
五、故障检修
六、实训心得
一、实训目的及意义：
通过电子工艺实训可使我们学会一些常用电工工具、仪表、开关元件等的使用方法及工作原理。 接触电学知识，实现理论联系实际，并为后续专业课程的学****打下一定的根底。 收音机是最常用的家用电器之一，通过这次实****我们应该在了解其根本工作原理的根底上学会安装、调试、使用 ，并学会排除一些常见故障。
锡焊技术是电工、电子工艺的根本操作技能之一，通过实****要求大家在初步掌握这一技术的同时，注意培养自己在工作中耐心细致，一丝不苟的工作作风。 二、S66D型超外差收音机电路原理
：由双联可变电容的Ca和T1的初级线圈Lab组成，是一并联谐振电路，T1是磁性天线线圈，从天线接进来的高频信号通过输入调谐回路的谐振选出需要的电台信号，电台信号的频率是f=1/() 当改变Ca时就是能收到不同的电台信号
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities- 6 -
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
。
： 本机振荡和混频合起来称变频电路，变频电路是以VT为中心，它的作用是把通过的调谐电路收到的不同的频率的电台信号变换成固定的465KHz的中频信号，VT1，VT2，CB等元件组本钱机振荡电路，它的任务是产生一个比输入信号频率465KHz的等副高频信号，由于C1对于高频相当于短路，T1的次级Lab的电感量又很小，对高频提供了通路，所以本机振荡电路共基极的电路，振荡频率由T2，CB控制，CB是双联电容的一连，调节它以改变本机振荡频率，T2是振荡信号以反应的形