通常电话机都是用振铃作来电指示,这里介绍一个趣味小装置,当外线有电话打进,在电话振铃的同时,放在装饰柜上的“鲜花”怒放,不但有趣而且也富有极强的装饰效果。电路原理电话花开指示器电路如图1所示。电路主要由光电耦合器及可可控硅开关 Usually the phone is ringing for incoming instructions, here is a fun gadget, when the outside there is a phone call, ringing in the phone at the same time, on the decorative cabinet “flowers” in full bloom, not only interesting but also very rich Decorative effect. Circuit theory Telephone flow indicator circuit shown in Figure 1. The circuit is mainly composed of photocouplers and cacao silicon switches