Make a microphone out of a matchbox and pencil leads. Listen to sounds and music from the other side of the house using this DIY microphone. Simple audio electronics project. You will also need a battery, some wires and clips, and a pair of headphones or a speaker. Fun and simple science experiment, and great to do with children.
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Meze Headphones: http://www.mezeheadphones.com
Music: Super Friendly - Kevin MacLeod (incompetech.com)