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In telecommunications, a four-wire circuit is a two-way circuit using two paths so arranged that the respective signals are transmitted in one direction only by one path and in the other direction by the other path. The four-wire circuit gets its name from the fact that is uses four conductors to create two complete electrical circuits, one for ...
The iPod's signature click wheel. iPods with color displays use anti-aliased graphics and text, with sliding animations. All iPods have five buttons and the later generations (4th and above) have the buttons integrated into the click wheel — a design which gives an uncluttered, minimalist interface, though the circuitry contains multiple momentary button switches.
Glowing cathodes in two transmitting vacuum tubes. Repair and restoration of vintage amateur radio equipment may involve replacing vacuum tubes, reforming electrolytic capacitors if needed, replacing any faulty resistors, replacing two-wire power cords with three-wire cords except on transformerless AC/DC radios, and receiver alignment as ...
Two-wire circuits in new installations are limited to intercom and military field telephone applications, though these too are being supplanted by modern digital communication modes. To communicate in both directions in the same wire pair, conversion between four-wire and two-wire was necessary, both at the telephone and at the central office .
Later replaced by iPod Nano. Nano 1st 1, 2, 4 GB USB (FireWire for charging only) September 7, 2005 Mac: 10.3 Win: 2000: audio: 14 slideshow: 4 Replaced Mini. Available in black or white and used flash memory. Color screen for picture viewing. 1 GB version released later. 2nd 2, 4, 8 GB USB (FireWire for charging only) September 12, 2006 Mac: 10.3
Naval air traffic controller communicates with aircraft over a two-way radio headset A variety of portable handheld two-way radios for private use. A two-way radio is a radio transceiver (a radio that can both transmit and receive radio waves), which is used for bidirectional person-to-person voice communication with other users with similar radios, [1] in contrast to a broadcast receiver ...
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The iPod is a discontinued series of portable media players and multi-purpose mobile devices that were designed and marketed by Apple Inc. [2] [3] from 2001 to 2022. The first version was released on November 10, 2001, about 8 + 1 ⁄ 2 months after the Macintosh version of iTunes was released.