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目前广泛使用的按键式电子电话机,其振铃电路一般均采用电子铃专用集成电路,在工矿企业的生产现场,因机器设备产生的噪声很大,往往淹没了电话机的振铃声。为克服上述问题,笔者对按键式电子电话机振铃电路增加了一个增音器使振铃声增大,满足了生产现场之需要。本增音器的适用范围很广,只要振铃电路输出部分采用输出变压器和扬声器的电话机均可采用。其安装、使用方便,且制作简便、快捷,电原理如图①所示,虚线框为电话机振铃电路的输出部分电路。具体制作方法如下:
Currently widely used button-type electronic telephone, the ringing circuit are generally used electronic bell ASIC, the production site in industrial and mining enterprises, due to the noise generated by machinery and equipment are large, often overwhelmed the phone ringing. In order to overcome the above problems, the author adds a repeater to the ringing circuit of the push-button type electronic telephone to increase the ringing sound to meet the needs of the production site. The wide range of application of the amplifier, as long as the ring circuit output part of the output transformer and speaker phone can be used. Its installation, easy to use, and the production is simple, fast, the principle of electricity shown in Figure ①, the dashed box for the telephone ringing circuit output part of the circuit. Specific production methods are as follows: