笔者经过反复摸索,将该集成块不用配接变压器的接法,改成直接用压电喇叭,恢复响铃功能。如认为铃声小,可用两个啤酒盖做个空腔将喇叭放在里面,以增加响度,也可采用两只喇叭串联的办法来提高。详见 After repeated exploration, the integrated block need not be connected with the transformer connected, directly into the piezoelectric speaker, restore the bell function. If you think that the ringtones are small, you can use two beer caps to make a cavity to put the speaker inside, in order to increase the loudness, you can also use two speakers in series to improve. See details