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音响发烧友常常会遇到由 于音响开得较大声而难于听到 甚至听不到电话铃声的现象。 为此曾有人设计了一种通过电 话铃流来切断音响的装置。然 而这种装置存在着接线不方 便,对音响不利等不足之处。 笔者通过采用白炽灯泡制成的 电话铃控指示灯,在对音响不 产生任何影响的情况下,起到 了电话打来的告示作用,具有 电路简单、制作容易、工作可 靠等特点。另外在夜晚打或接 电话时,还可以起自动照明作 用。同时,此装置还可以起到 电话机是否挂好机的告示作 用,以防电话机用后没有挂 好,影响外面电话的打入。 电路如图1所示。图中使 用了光电耦合器MOC3020和 双向可控硅SCR等电子元件。光电耦合器是起隔离控制的作用,以防市电窜到电话机上,可控硅作为电子开关。a、b两个输入端是串接在电话机的进线线路中。
Audio enthusiasts often encounter due to the sound is louder and difficult to hear or even hear the phone ringing phenomenon. To this end, someone designed a device to cut off the sound by ringing the telephone. However, this device is inconvenient wiring, adverse effects on the sound and so on. I use the incandescent light bulbs made of telephone bell control lights, the sound does not have any impact on the circumstances, played a sign call, with the circuit is simple, easy to make, work and reliable. In addition to playing or receiving calls at night, you can also play an automatic lighting. At the same time, this device can also serve as a reminder of whether the phone hung up, to prevent the phone is not hung up after use, affecting the entry of the phone outside. Circuit shown in Figure 1. The figure uses the optocoupler MOC3020 and triac SCR and other electronic components. Optocoupler is the role of isolation control in case of mains power channeling to the phone, SCR as an electronic switch. a, b two inputs are connected in series with the incoming line of the telephone.