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音乐电弧－有趣的特斯拉线圈！

时间：11月9号周日，下午13:00  －15:00.

费用：300元；新车间会员享受200元优惠价格。费用包含所需材料。

用高压电弧制做扬声器，就是利用高压音频电流电离空气，空气受热膨胀、震荡发声。有人将这个装置放到众筹平台KS上，小火了一把，记得是99美金一个，还是套件，需要自己组装。今天我们就用特斯拉线圈“拉弧”做的音乐播放器！

原理：  使用传统的TL494电源芯片，驱动IRFP250场效应管半桥，推动高压包产生高压电弧放电。输入到驱动电路音频信号通过控制RL494输出波形的死去时间来控制电弧的粗细。由于其变化频率很高，虽然肉眼观察不到电弧的瞬间粗细变化，但是由于其粗细变化足以影响到周围的空气并使之振动，并产生与输入信号相同的声波.

虽然看似简单，但是没有电子知识还是不那么容易的哦。

*** 电击危险，心脏虚弱者不建议参加本次工作坊！

观看神奇的特斯拉线圈音乐表演： http://www.bilibili.com/video/av335489/

Time: 13:00 - 15:00 Sunday, Nov. 9th.

Fee: 300rmb; 250rmb for xinchejian members. Price includes all materials needed.

Are you tired of those old black speakers that only just make sounds? Maybe sound reactive lights are just not enough to impress you? How about a Plasma Speaker?

A plasma speaker is a device that generates an high voltage electrical arc that makes purple light and music! Without any speakers or any moving parts! Sounds too good to be true? Well, you're wrong, the high voltage arc really does 'sing' by vibrating in the air. (Of course, you will need to give the device musical audio for it to work.)

*** Do NOT even attempt to build one if you have heart prolems or weak heart or wearing a pacemaker, because one little shock from this thing can put you out.

Here is a video of tesla coil playing music:  http://www.bilibili.com/video/av335489/