Homemade Miniature Matchbox Microphone.

If your children are out of ideas for their science project, this matchbox microphone will be perfect for them! Using a matchbox and pencil lead, you can create a simple microphone that can transfer sounds from across the room! This project is great for teaching the basics of audio electronics, and can be easily done within an hour. You will also need some wire, a small battery, and a set of cheap headphones.

Image source: DaveHax

DIY video shows: Homemade Miniature Matchbox Microphone

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