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LEDs, or light-emitting diodes, are widely used in many different circuit applications. Some of the most common applications for LEDs include circuit board indicators, arrays, light bars, and bar graphs. While all of these applications have a similar purpose, each has its own unique working principles.

Circuit Board Indicators

LEDs are commonly used for circuit board indicators, as positioned on soldered circuit boards, such as motherboards. This type of LED receives power from the circuit board and when lit, the LED signals a system ignition or power activation. The LED will remain lit as long as the circuit board has power. To turn off the LED, the circuit power has to be turned off or otherwise disconnected.

Arrays

LED arrays are long strips of LEDs, combined together to create a longer illumination display. The total length of the LED array will depend on the size of the circuit board and the amount of LED lights used. LED arrays are usually used to create long light displays, such as decorative lighting or traffic signals. The LED array is powered by the circuit board and the LED lights in the array are typically arranged in a particular sequence. When the circuit board is powered, the LED lights turn on in the predetermined sequence.

Light Bars

Light bars are another type of LED display, featuring multiple LED lights arranged in straight bars. These bars come in various sizes and shapes, and their primary purpose is to provide a visual display for data or information. For example, in automobiles, light bars are used for speedometers, dashboards and other indicators. The total length of the light bar will depend on the amount of information being displayed and the size of the circuit board.

Bar Graphs

Bar graphs are an example of solid-state LED displays, which are used in many different applications. Bar graphs are created using multiple LEDs, arranged horizontally or vertically on the circuit board. When the circuit board is powered, the LEDs light up in a specified sequence, creating the desired visual effect. Bar graphs are most commonly used in the fields of computer graphics, sound engineering and instrumentation. The individual LEDs used on the bar graph are usually different colors, allowing for a wide range of graphical displays.

The number of LEDs used in any given application will depend on the size of the circuit board and the amount of light needed for the desired visual effect. LEDs are an incredibly durable light source, and can be used in numerous applications, from simple circuit boards to advanced display systems. They provide a wide range of uses, from providing a visual display to various circuits and components.

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