我们利用一只旧电话机中拆下的炭精送话器,以及几只常用的电子元件,即能组装一台无须调整、结构相当简单、音质清晰、放音洪亮的最简易微型扩音机,确很有趣味,同时在一些小场合范围扩音其效果相当不错。具体电路见图1所示。元件选择:炭精送话器从老式旧电话机的听筒内拆下,大功 Using the carbon microphones removed from an old phone and several commonly used electronic components, we assembled a simple miniature megaphone without adjustment, a fairly simple structure, clear sound quality and loud playback. Very interesting, at the same time in some small occasions, the scope of the sound amplification is quite good. Specific circuit shown in Figure 1. Component Selection: Carbon microphones are removed from the handset of an older, old telephone with great work