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Basic Electronics for Tomorrow's Inventors by Nick Dossis

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CHAPTER 10
Beep! Beep! Make an Electronic Horn
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SUPPOSE YOU’RE DRIVING DOWN THE ROAD IN your car and you need to warn another car or a pedestrian that you’re approaching. You wouldn’t lean out of the window and shout, “Get out of the way!” Instead, every car comes complete with an electronic horn, which is normally situated behind the front grill of the car. The horn is activated by a switch that is usually positioned in the center of the steering wheel. Pressing the steering wheel will activate the horn, which normally makes a noise that’s loud enough for other cars and people to hear.
This experiment explores how you can build a miniature horn ...

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