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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 ...
Bicycle Air-Horn / Fire Extinguisher Air-Hornby jedbd
Extremely Loud Train Horn Bicycleby TheChadster
Loud Bike Horn (car horn)-easy to makeby Jonahpi
Putting A Car Horn On Your Bicycle!by frenzy
How to build a bicycle car horn using 16 standard rechargable AA batteriesby sturmradek
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