Tikker
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A tikker was a device that allowed early crystal radio circuits to detect continuous-wave telegraphy. Ordinary crystal detectors cannot demodulate continuous waves; the direct current (DC) signal is inaudible in headphones. The tikker consisted of a fine wire resting on a rotating drum, which interrupted the DC voltage to produce an audible tone.
It was invented by Valdemar Poulsen, who is perhaps best known for developments in magnetic recording.
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