He’s managed to squeeze a tiny FM radio receiver into a ballpoint pen. He also built his own bone conduction microphone to make covert listening possible. The FM radio receiver is nothing too ...

Back in 2009, he built “El Silbo”, a ham radio transmitter powered entirely by ... is installed at the bottom of the can to convert voice power to electrical power. The signal is passed ...

FM transmitters allow you to play songs, podcasts, and other media from your phone using your car's radio. They convert your smartphone's audio into radio signals. Not only can your radio pick it ...