More Marconi
Article Abstract:
The first radio receiver built by Marconi in 1896 used a primitive vacuum tube which was called the coherer. It was filled with loose nickel and silver filings that compacted when exposed to electrical current and transmitted sound. Scientists are still unsure of why this happens.
Publication Name: Audio
Subject: Music
ISSN: 0004-752X
Year: 1995
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Turn down the volume!
Article Abstract:
The natural sounds of a campground can be shattered by 1980s-era audio equipment, which generally produces a heavy, high volume sound. A trip to a campground in which such audio equipment is regularly used to provide nighttime entertainment is described.
Publication Name: Audio
Subject: Music
ISSN: 0004-752X
Year: 1995
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The repeater principle
Article Abstract:
A fiberoptic technology in which rare-earth ions are grafted onto a glass fiber to amplify laser signals transmitted along the fiber may have applications in the audio equipment industry. An erbium-laser amplifier is in development.
Publication Name: Audio
Subject: Music
ISSN: 0004-752X
Year: 1992
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