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  2. Time switch - Wikipedia

    en.wikipedia.org/wiki/Time_switch

    A simple 24-hour cyclical electromechanical time switch with a French CEE 7/5 socket. A time switch (also called a timer switch, or simply timer) is a device that operates an electric switch controlled by a timer.

  3. Timer - Wikipedia

    en.wikipedia.org/wiki/Timer

    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.

  4. Electric clock - Wikipedia

    en.wikipedia.org/wiki/Electric_clock

    They essentially count cycles of the power supply. While the actual frequency may vary with loading on the grid, the total number of cycles per 24 hours is maintained rigorously constant, so that these clocks can keep time accurately for long periods, barring power cuts; over months they are more accurate than a typical quartz clock. This was ...

  5. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    24-hour digital clock in Miaoli HSR station. A public 24-hour clock in Curitiba, Brazil, with the hour hand on the outside and the minute hand on the inside.. A time of day is written in the 24-hour notation in the form hh:mm (for example 01:23) or hh:mm:ss (for example, 01:23:45), where hh (00 to 23) is the number of full hours that have passed since midnight, mm (00 to 59) is the number of ...

  6. 24-hour analog dial - Wikipedia

    en.wikipedia.org/wiki/24-hour_analog_dial

    The 24th hour on the right side of the dial is typical for the old Italian time system of 24 hours counted from dusk. A sundial showing all 24 hours; impractical but symmetrical Shepherd Gate clock outside the Royal Observatory, Greenwich The clock at Ottery St Mary , England, showing nearly noon, using the 12-hour time system on a 24-hour ...

  7. 555 timer IC - Wikipedia

    en.wikipedia.org/wiki/555_timer_IC

    In 1972, Signetics originally released the 555 timer in DIP-8 and TO5-8 metal can packages, and the 556 timer was released in a DIP-14 package. [ 4 ] In 2006, the dual 556 timer was available in through-hole packages as DIP-14 (2.54 mm pitch), [ 21 ] and surface-mount packages as SO-14 (1.27 mm pitch) and SSOP-14 (0.65 mm pitch).

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