Home › Forums › temp › An amazing crystal set receiving loop on YouTube and some other ideas › Speaking of Speakers…
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When I was about 10, I got a generator/light set for my bicycle. Like all the kids we put baseball cards or baloons in the spokes of the wheels to make a motor sound.
I hung a speaker under my seat and hooked it to the generator. Made a great siren sound. A steady wail that changed frequency with speed. Lasted a few days until the cone rattled apart. It was an old speaker so I guess the paper cone couldn’t handle the violent vibrations.