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Learn about the origin and evolution of headphones, from the first telephone receivers to the modern wireless earbuds. Discover the different types of headphones, such as circumaural, supra-aural, earbuds, and bone conduction, and how they connect to various audio sources.
Uniscope was a series of green screen terminals made by Sperry Rand and Univac since 1964, mainly used to communicate with Univac mainframes. Learn about the models, features, history and emulators of Uniscope terminals.
PS Audio is an American company founded by Paul McGowan and Stan Warren in 1973, specializing in high-fidelity audio components. Learn about its corporate history, historic products, and current offerings in amplifiers, preamplifiers, DACs, streaming audio, and more.
Line level is the specified strength of an audio signal used to transmit analog sound between audio components. Learn about the nominal levels, reference voltages, impedances, and connectors of line level signals in consumer and professional applications.
The model 302 telephone is a classic desk set that combined the ringer and network circuitry in one unit. It was manufactured by Western Electric from 1937 to 1955 in the US and by Northern Electric in Canada until the late 1950s.
The first ballots in the nation are scheduled to start going out Friday in North Carolina, but that could be delayed after a judge ordered a temporary pause on ballot distribution.
The eMate 300 featured a 6.8" 480x320 resolution 16-shade grayscale display with a backlight, stylus pen, keyboard, infrared port, and standard Macintosh serial/LocalTalk ports. The keyboard was roughly 85% the size of a standard "full size" keyboard. Power came from built-in rechargeable batteries, which lasted up to 28 hours on full charge ...
Learn about the different types of battery chargers, how they store energy in batteries, and how they adjust the charging current and voltage depending on the battery type and condition. Find out the advantages and disadvantages of simple, fast, and intelligent chargers, and the factors that affect the charging rate and temperature.