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The timer may switch equipment on, off, or both, at a preset time or times, after a preset interval, or cyclically. A countdown time switch switches power, usually off, after a preset time. A cyclical timer switches equipment both on and off at preset times over a period, then repeats the cycle; the period is usually 24 hours or 7 days.
A typical kitchen timer. A timer or countdown timer is a type of clock that starts from a specified time duration and stops upon reaching 00:00. An example of a simple timer is an hourglass. Commonly, a timer triggers an alarm when it ends. A timer can be implemented through hardware or software.
An intermediate switch can, however, be implemented by adding appropriate external wiring to an ordinary (six terminal) DPDT switch, or by using a separate DPDT relay. By connecting one or more 4-way (intermediate) switches in-line, with 3-way switches at either end, the load can be controlled from three or more locations.
Sony's chairman of board of directors since 2005 to 2009, Ryōji Chūbachi said, in 2007, that the company was well aware of the existence of this urban legend [1] [2]. The Sony timer (ソニータイマー, Sonī taimā), or Sony kill switch, is an urban legend that electronic devices produced by Sony are equipped with a timer which, upon reaching a deliberately preset deadline, causes the ...
All new installations of pedestrian signals in the US must include a countdown timer, unless the countdown timer is less than seven seconds long, per the 2009 MUTCD. In New York City, however, this is not the case, as only streets that are wide enough will get countdown timers, regardless of the length of the countdown. [42]
[3]: 141 The computers maintained control over 159 signals in the cities through telephone lines. [3]: 143 In the 1990s, Countdown timers on traffic lights were introduced. Timers are useful for pedestrians, to plan whether there is enough time to cross the intersection before the end of the walk phase, and for drivers, to know the amount of ...
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