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1用两根铅笔芯靠近盒底两壁穿过一只火柴盒。在两根笔芯上横放一根短笔芯。把所有芯刮光滑。这就成了一个迷你麦克风。把这个麦克风连接上电铃线,然后和电池及旁边房间的耳机连接起来(你也可以使用半导体收音机上的耳机)。平拿火柴盒向其中讲话。耳机里可以清楚地听到你的声音
1 Use two pencil leads near the bottom of the box through a matchbox. Place a short refill across the two refills. Smooth all the cores. This became a mini-microphone. Connect this microphone to the bell wire and connect it to the battery and headphones in the next room (you can also use the headphones on the semiconductor radio). He took the matchbox and spoke to it. You can clearly hear your voice in headphones