论文部分内容阅读
普通的台式电话来电铃声比较单调,若把电话铃声关闭或把电话内部的振铃电路断开,再把下面这个电路与电话线相连,来电时就会发出“喂,有电话啦”等自录的趣味铃声。有电话打入时,交流振铃电压经C1、R1的降压,全桥整流器整流,使VT导通,VT的c、e两极与IC2的边沿触发键并联,相当于按下了IC2的边沿触发键。IC2(ISD1110)是单段语音录放板,它可以录制小于10s(秒)的语音或音乐。IC2的工作电压为5V,因此IC4不能省略。IC3是简单的功放器,把自录的铃声放大,S开关可控制音量,闭合时为大音量,断开时为小音量。
Ordinary desktop phone ringtones more monotonous, if the ringtones are turned off or the phone’s internal ringing circuit is disconnected, then the following circuit connected with the phone line, the caller will be issued when “Hello, have a phone,” and so on Fun ringtone A phone call, the exchange of ringing voltage by C1, R1 step-down, full-bridge rectifier rectifier, the VT turn-on, VT c, e poles and IC2 edge trigger key in parallel, the equivalent of pressing the edge of IC2 Trigger key. The IC2 (ISD1110) is a single-segment voice recording board that can record voice or music in less than 10s (seconds). The working voltage of IC2 is 5V, so IC4 can not be omitted. IC3 is a simple amplifier, the self-recorded ringtones to enlarge, S switch can control the volume, closed when the volume, disconnect the small volume.