Build It: A Compact Car-Mount Megaphone

Build It: A Compact Car-Mount Megaphone: "Here’s a project sure to head off your road rage. Instead of silently fuming the next time you’re stuck in traffic behind some attention-deficient driver who fails to move when the light turns green, just give him a friendly yet firm word of encouragement through your DIY megaphone. He’ll definitely get the message. The device projects your voice using a small microphone connected to a preamplifier and boosted with a power-amplifier circuit. It won’t deafen anyone, but it can provide a step up to more than twice your normal speaking volume. Of course, you don’t have to be on the road to use it—the megaphone comes in handy anywhere you find yourself needing to send a message loud and clear."