Speakers are so common in the world, but do you know that you can make primitive one very easily? Using conductive ink pen, your simple drawing can work as a speaker. Let's see it works!A coil drawn by a conductive ink works as a speaker, as the video shows. Draw your own speaker and play with it. ...By: AgIC
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from Instructables: exploring - technology - robots http://ift.tt/1BgF3WS
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