全固态电话留言自动应答装置李学海，胡素英，张明炜介绍了全固态电话留言自动应答装置的工作原理，对其实用电路进行了详细分析。最近几年，电话机的普及率迅速提高，给人们的工作和生活带来诸多方便，也使人们的信息观念不断增强。但是，广大电话用户常常因话机无人值守... All-solid-state telephone message answering device Li Xuehai, Hu Suying, Zhang Mingwei introduced the working principle of all-solid-state telephone answering device and analyzed the practical circuit. In recent years, the popularization rate of telephones has rapidly increased, bringing lots of conveniences to people’s work and life, and also increasing the people’s concept of information. However, the majority of telephone users often unattended because of the phone ...