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TIMER SOLID STATE -MC SPARE PA

Solid-state electronics means semiconductor electronics; electronic equipment using semiconductor devices such as transistors, diodes and integrated circuits (ICs). The term is also used for devices in which semiconductor electronics which have no moving parts replace devices with moving parts, such as the solid-state relay in which transistor switches are used in place of a moving-arm electromechanical relay. Examples of solid state electronic devices are the microprocessor chip, LED lamp, solar cell, charge coupled device (CCD).

A timer is a specialized type of clock used for measuring specific time intervals. Timers can be categorized into two main types. A timer which counts upwards from zero for measuring elapsed time is often called a stopwatch, while a device which counts down from a specified time interval is more usually called a timer. It is a control device that outputs a signal at a preset time after an input signal is received and then triggers another device or action.