HA908(Ⅷ)P/TS 型电话机是一种脉冲/音频兼容,具有15个记忆存储号码(16位)、可重拨功能的普及型全自动集成电路电话。电路原理参见附图。现将其电路结构与工作原理介绍如下:从电路图中可以看出,该话机的电路结构包括三部分:即以集成电路 U1(KA2410)及外围元件组成的振铃电路部分;以集成电路 U2(WE9145)及外围元件所 The HA908 (Ⅷ) P / TS telephone is a pulse / audio compatible universal automatic integrated circuit (IC) phone with 15 memory storage number (16 bits) and redial capability. Circuit principle see attached picture. Now the circuit structure and working principle are introduced as follows: It can be seen from the circuit diagram that the circuit structure of the telephone comprises three parts: a ringing circuit part composed of an integrated circuit U1 (KA2410) and a peripheral component; a circuit part of an integrated circuit U2 WE9145) and peripheral components