Instructables

My bike car horn

Picture of My bike car horn
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This is my bike sound and light system, based off of a $15 'ooga horn' meant for use on a car. It sounds best when overclocked to 18 volts (vs. 12). Video with sound here.
You could swap out the car battery with a smaller motorcycle battery to reduce the weight load.
Ugly as sin, but neat set up, functionally speaking.