Wednesday , January 16 2019
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DIY bottle speaker rack electromagnetism demo

This is a project my students and I do each year where we make audio speakers out of water bottles. 40 turns of very thin insulated magnet wire (from Radio Shack) around a paper tube taped to the neck of a water bottle that has been cut to make a cone. Quality is surprisingly quite good for how simple it is. For best results you must use a powered amplified sound source. In this case, I have a pair of computer speakers that plug into 120V outlet and have a ‘headphone out’ 3.5mm jack. Your MP3 player or cell phone won’t have enough voltage to drive the current necessary to get vibration from the cones. I made this rack to make it easier for my students to experiment with different bottle shapes and positions. The rack itself does not have power, the electricity comes from the sound source. Blue is left channel, Green is Right channel, Black is ground that both channels share.

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