The online timer

A timer is a device or minutes, often programmable measuring time. The first generation were hourglasses, clocks that were replaced later by a conventional electronic device entirely. When time passes is configured to skip an alarm or another function as a warning.
household

A online timer can be a cooking utensil to control the cooking time. Often integrated in conventional ovens or microwave ovens. Also appliances such as washing machine or dryer is equipped with timers.

Currently most electronic devices such as mobile phones or personal computers, have a timer function.
Socket with a timer.

A timer can also be used as a simulator of presence, allowing an electronic device (such as a radio or light) stays on for a predetermined time, to prevent theft. Also can be used as a device connected to electricity is connected or disconnected at any given time (relative, eg. At one time or absolute, eg. At 13 hours). This is especially useful for those devices that do not have their own or a timer that can be programmed.
other Uses

Countdown - countdown device, signal - usually sound, such as a bell - before the passage of the set number of minutes. Used, among others in the household, such as in the kitchen, where he helps ensure proper cooking time.

Mechanical timers usually work on the principle of using a spring mechanism: turning the knob on the pitch angle adjustable graduated in minutes start slow rotation of the wheel, which is approximately as long as the set due to graduation. Newer solutions, electronic components and electronic displays, usually provide more precise timing, accurate to seconds. In today's mobile phones, it is common to install timers among the various helper applications, usually regardless of the timer.The timer is an important element in many fields, such as in biological laboratories, which can precisely control the exposure time, such as enzymatic digestion.

Also used for the detonation of explosive s, allowing evacuate an area of ​​danger.


The timer is a clock device, program or other mechanism by which a particular activity or event for starting and end times may be controlled. The timer is different from that display the time clock in the fact that its main purpose is not to show the time, but to convey the information reaching the time limit, or cause an event at a particular time or after a certain time.
A simple digital timer. Picture of a timer includes a control circuit, LED display, battery and buzzer.

Implementation in the timer may be mechanical, electromechanical, chemical, electronic or software.

A typical example is a mechanical online stopwatch timer cooking clock or egg timer. The fuse is a chemical timer. Dry the timer may be based, for example, an acid, which is corrosive to certain period of time Timer device locks the safety catch. A soft timer is a logical structure, which delays the progress of the program until a desired number of repetitions is completed or further condition is met.
The timer circuit

Traditional timer circuits 8253 (PC) and 8254 (the AT) clock inputs is connected to a standard 1.193180 MHz crystal frequency. The frequency is 1/4 of the original IBM PC's clock frequency. Timer 0 IRQ0 is connected to the line. It typically causes an interruption at 18.2 times per second. Timer 0 Gate is permanently connected to the charts. These circuits are useful for their own timers interrupt routines Timing. They can also be used for precise measurement.