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555 timer IC. The 555 timer IC is an integrated circuit used in a variety of timer, delay, pulse generation, and oscillator applications. It is one of the most popular timing ICs due to its flexibility and price. Derivatives provide two ( 556) or four ( 558) timing circuits in one package. [2]
Context switch. In computing, a context switch is the process of storing the state of a process or thread, so that it can be restored and resume execution at a later point, and then restoring a different, previously saved, state. [1] This allows multiple processes to share a single central processing unit (CPU), and is an essential feature of a ...
A time switch (also called a timer switch, or simply timer) is a device that operates an electric switch controlled by a timer . Intermatic introduced its first time switch in 1945, which was used for "electric signs, store window lighting, apartment hall lights, stokers, and oil and gas burners." A consumer version was added in 1952.
A shot clock in an NCAA basketball game, shown as the red LED digits above the basket. A shot clock is a countdown timer used in a variety of games and sports, indicating a set amount of time that a team may possess the object of play before attempting to score a goal. Shot clocks are used in several sports including basketball, water polo ...
Doomsday Clock. The Doomsday Clock is a symbol that represents the likelihood of a human-made global catastrophe, in the opinion of the members of the Bulletin of the Atomic Scientists. [1] Maintained since 1947, the clock is a metaphor, not a prediction, for threats to humanity from unchecked scientific and technological advances.
A watchdog timer ( WDT, or simply a watchdog ), sometimes called a computer operating properly timer ( COP timer ), [1] is an electronic or software timer that is used to detect and recover from computer malfunctions. Watchdog timers are widely used in computers to facilitate automatic correction of temporary hardware faults, and to prevent ...
Pulse-per-second signal. A pulse per second ( PPS or 1PPS) is an electrical signal that has a width of less than one second and a sharply rising or abruptly falling edge that accurately repeats once per second. PPS signals are output by radio beacons, frequency standards, other types of precision oscillators and some GPS receivers.
Pencil detonator. An array of World War 2 pencil detonators displayed at the Museum of the British Resistance Organisation at the Parham Airfield Museum, 2007. A pencil detonator or time pencil is a time fuze designed to be connected to a detonator or short length of safety fuse. They are about the same size and shape as a pencil, hence the name.
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