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LEDs are small, efficient, and widely used sources of light. LED circuit board indicators, arrays, light bars, and bar graphs are all popular applications of LEDs. These components can be found in countless forms of electronics, including home appliances, computers, and automotive equipment.

A circuit board indicator is usually used to provide a visual indication of an electrical signal’s presence or absence. It consists of a LED, resistors for current limiting, and a decoupling capacitor. The LED can be a single-color or bi-color LED and the resistors will determine the LED’s brightness and current consumption. The LED is connected to the positive and negative supply and the decoupling capacitor removes any transient voltages from the supply.

An LED array is a group of LEDs configured in a specific pattern, with each LED either powered or unpowered. They are commonly used in displays of various sorts, with the aim of providing a strong, readily visible output. Array LEDs come in a wide number of sizes and styles, including surface mount, right angle, and printed circuit board (PCB) mount types. Some arrays have multiplexing circuitry built in that allow them to display multiple patterns. There are also “smart” arrays with integrated logic circuits that can respond to commands from a controller.

LED light bars and bar graphs consist of multiple LEDs attached together in a line. The bars contain built-in current-limiting resistors, enabling them to be powered directly from a DC voltage source. Light bars are commonly used in indicator panels, traffic signs, and automotive headlights. Bar graphs are primarily used to display numerical data in the form of a graph. The bars can range from single-color to full-color and typically last for tens of thousands of hours.

LEDs are incredibly versatile, robust, and highly efficient components. The popularity of LED circuit board indicators, arrays, light bars, and bar graphs is testament to their versatility and ease of use. Whether used for industrial, automotive, or home applications, these components are an invaluable addition to any electronic design.