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  2. Pencil detonator - Wikipedia

    en.wikipedia.org/wiki/Pencil_detonator

    Number ten delay switches had delays ranging from 10 minutes to 24 hours and were accurate to within plus or minus two or three minutes in an hour's delay, and plus or minus an hour in a 12-hour delay, though environmental conditions could affect this. The switches were typically issued in packs of five, all the switches in a pack having the ...

  3. Time switch - Wikipedia

    en.wikipedia.org/wiki/Time_switch

    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.

  4. Relay - Wikipedia

    en.wikipedia.org/wiki/Relay

    Time-delay relays can be constructed to delay armature motion on coil energization, de-energization, or both. Time-delay relay contacts must be specified not only as either normally open or normally closed, but whether the delay operates in the direction of closing or in the direction of opening. The following is a description of the four basic ...

  5. Time-delay combination locks - Wikipedia

    en.wikipedia.org/wiki/Time-delay_combination_locks

    Unlike the time lock, which unlocks at a preset time (as in the case of a bank vault), time-delay locks operate each time the safe is unlocked, but the operator must wait for the set delay period to elapse before the lock can be opened. Time delay safes are most commonly used in businesses with high cash transactions. [1]

  6. 555 timer IC - Wikipedia

    en.wikipedia.org/wiki/555_timer_IC

    The 555 timer IC is an integrated circuit used in a variety of timer, delay, ... missing pulse detection, bounce-free switches, touch switches, frequency dividers ...

  7. Ring oscillator - Wikipedia

    en.wikipedia.org/wiki/Ring_oscillator

    From here, it can be easily seen that adding more inverters to the chain increases the total gate delay, reducing the frequency of oscillation. The ring oscillator is a member of the class of time-delay oscillators. A time-delay oscillator consists of an inverting amplifier with a delay element between the amplifier output and its input.

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