用扬声器发声的低压收音机,体积小、耗电省,深受青少年朋友们的欢迎。但这种机子售价较高,对于爱动手的青少年来说,还不如自己动手制作。下面将笔者设计的一套数据齐全的1.5V收音机介绍给大家,该机仅用一节电池,并用扬声器发声,音量及更换电池的时间与3V机差不多,并具有电子开关功能。由于电路简单、取材容易、成本低,较适合中学生们动手制作。电路工作原理如下:图1是本机电路图,由电子开关、AM接收部分 Loudspeakers with low-voltage radio, small size, low power consumption, welcomed by young friends. However, the high price of this machine, for young people who love hands, it is better to do it yourself. Here I will design a complete set of data 1.5V radio introduced to everyone, the aircraft only a battery, and use the speaker sound, volume and time to replace the battery with the 3V machine almost, and has electronic switch function. As the circuit is simple, easy to draw, low cost, more suitable for middle school students hands-on production. Circuit works as follows: Figure 1 is the circuit diagram, by the electronic switch, AM receiver section