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LEDs, or light-emitting diodes, are one of the most popular circuit board indicators used in electronics today. They come in many different shapes and sizes, from small single-color indicators to larger multi-color arrays, light bars, and bar graphs. LED\'s are used in a variety of applications within the electronics industry, from simple on/off indicators to more complex projects for their light emitting properties.

The working principles of LEDs are based on the flow of electrons. An LED is a two-lead semiconductor device, with one lead acting as a source (anode) and the other as a drain (cathode). When electric current passes through the LED, electrons move from the source to the drain. This flow of electrons causes a certain amount of energy to be released, which creates light. The amount of light produced is determined by the current passing through the LED.

LEDs are popularly used as a source of lighting and as indicators because they are highly efficient, consume very little power, can be driven by low voltage, and have a long life expectancy. LEDs can be found in a variety of products such as traffic signals, vehicle headlights, and computer displays. They are also used in medical applications, and in microscopes, where their light-emitting properties are necessary for accurate measurements.

In terms of circuit board indicators, LEDs are an effective and cost-efficient way to provide visual feedback. They are used in a variety of projects, such as LED arrays, light bars, and bar graphs. LED arrays are often used as indicators, as they can provide a high degree of visibility in a small space. Light bars and bar graphs are used to display a range of information, often in a graphical format, such as temperature and humidity.

LEDs are also used in the automotive industry, typically as signal indicators, stop and tail lights, or reversing lights. Additionally, in industrial applications, LEDs are used for machine and process control, safety systems, and alarm systems. And, since LEDs are capable of creating a wide range of colors, they are also becoming increasingly popular for decorative purposes.

LEDs are a versatile tool for circuit board indicators and have multiple applications, from simple lights to complex industrial systems. LEDs are highly efficient, long-lasting, and are an affordable, reliable source of lighting, making them the perfect choice for many applications.

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