ＰＴ－８９２型无绳电话拨号电路的分析与检修阮殿清无论是无绳电话机还是普通电话机，其拨号电路（包括脉冲／双音频或Ｐ／Ｔ兼容）都是由两部分电路组合而成，即拨号集成电路与外接发号电路。虽然各种电话机使用的拨号集成电路型号各异，但外接发号电路的连接形式和结构... Analysis and Maintenance of Dialing Circuit of PT-892 Cordless Telephone Ruan Dianqing Both dialing circuits (including pulse / dual audio or P / T compatible) are composed of two parts of circuits, that is, a cordless telephone or an ordinary telephone. Integrated Circuits and External Circuits. Although various types of telephone dial-up integrated circuits used in different models, but the external connection number of the circuit structure and structure ...