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晚间使用电话,如果没有光线照明,会觉得很不方便。这里,介绍两款自制的电话灯、读者有兴趣不防一试。 一、电话线直接控制 电路如图1、所示。本电路可实现以下功能:①拨号照明 提起话筒,灯即亮,可当作拨号照明灯;②提醒挂机 打完电话挂机,如果灯不能熄灭,说明话筒未放好,可提醒正确挂机;③盗打警示和外线断线提示 当家中未打电话而灯亮,可提起话筒,听听是否有声音,如有话音,说明有人正盗用你的电话线路;如无声息,则可能是
Using the phone at night, if there is no lighting, will feel very inconvenient. Here, introduce two home-made phone lights, the reader is interested in not to prevent a try. First, the telephone line direct control circuit shown in Figure 1, shown. The circuit can achieve the following functions: ① Dialing lighting lifted the microphone, the light is bright, can be used as a dialing light; ② reminder hang up the phone hang up, if the light can not be extinguished, indicating that the microphone is not put, can remind the correct hang up; Beat the alarm and cut off the outside prompt When the home is not called and light, you can lift the microphone to hear whether there is a voice, if there is voice, that someone is stealing your phone lines; if there is no sound, it may be