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LEDs (light-emitting diodes) are one of the most common circuit board indicators used in electronic devices today. They come in a variety of shapes, sizes and colors, and can be used in arrays, light bars, bar graphs, or as a single indicator. LEDs are typically used to indicate the status of a circuit, such as on-off, data passing, low-high, etc., and can be designed for many applications. LEDs have a very low power consumption, making them perfect for battery operated devices. LEDs are also popular for their durability, as they are able to withstand extreme temperatures and vibrations. When used as a single indicator, an LED will only light up when an appropriate voltage is applied to it. This is referred to as forward-biased operation, which is how most LEDs are used. LEDs can also be arranged in series or parallel configurations. In a series configuration, all LEDs are connected to the same positive voltage, and current will only flow through each LED when a voltage is applied. In a parallel configuration, each LED is connected to a separate voltage source. LED arrays are very popular in digital displays, such as LED message displays and LED clocks. Each LED in the array is controlled by an individual circuit, allowing the display to show a wide range of images, numbers, and animations. LED light bars are very popular for use in indoor lighting systems. They are often used to provide a uniform amount of illumination, and can be used in combination with sensors for optimal efficiency. LED bar graphs are typically used to display the relative values of a quantity. They can be used to show the level of a voltage, current, or resistance over a period of time. They are often used in laboratory settings and to show trends in data. LEDs are very reliable, durable, and efficient circuit indicators for a variety of applications. They have a long lifetime, low power consumption, and are relatively inexpensive when compared to other circuit board indicators. LEDs are easy to use, and can be configured in many ways depending on the application. Overall, LEDs are one of the most popular and versatile circuit board indicators available. They can be used in a wide range of applications, from indicators to displays, and can be arranged in arrays, light bars, and bar graphs for increased functionality. LEDs offer an efficient and reliable solution for many circuit board applications.

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