LM3914 IC Dot and Bar Display Driver
The LM3914 IC is a versatile dot/bar mode display driver designed to convert an analog voltage input into a visual LED, LCD, or VFD display. Each of the 10 outputs corresponds to a specific voltage level, lighting up one (dot mode) or multiple LEDs (bar mode).
This IC is widely used in battery level indicators, audio level meters, voltmeters, and power supply monitoring systems. It integrates an adjustable reference voltage and current regulator, eliminating the need for complex external circuitry.
🔹 Applications
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Battery level indicators
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Analog voltmeters and ammeters
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Audio level indicators (VU meters)
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Power supply monitoring systems
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Display drivers for electronic measurement devices
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Robotics and embedded projects requiring visual feedback
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DIY electronics and educational projects
🔹 Precautions
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Supply voltage must be within 3V to 25V
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Exceeding LED current ratings may damage LEDs
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Use proper heat dissipation if driving high current loads
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Ensure correct reference voltage adjustment for accuracy
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Handle IC carefully to prevent ESD damage
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Keep noise on analog input to a minimum for stable display
🔹 Technical Specifications
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IC Type: Dot/Bar Display Driver
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Package: DIP-18
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Number of Outputs: 10 (drives LEDs, LCDs, or VFDs)
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Input Voltage Range: Adjustable (0V to 5V typical)
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Operating Modes: Dot mode / Bar mode
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Output Drive Capability: Up to 30mA per LED output
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Reference Voltage: Adjustable internal reference (1.2V typical)
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Supply Voltage Range (Vcc): 3V – 25V
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Power Dissipation: Low (CMOS compatible)
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Pin Count: 18 pins
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Operating Temperature Range: 0°C to +70°C
📹 Tutorial Video
Watch LM3914 Display Driver Tutorial
🔹 Related Categories
🔹 Summary
The LM3914 Dot/Bar Display Driver IC (DIP-18) is a highly reliable IC for battery meters, voltmeters, and visual indicators. With its ability to directly drive up to 10 LEDs in dot or bar mode, adjustable reference voltage, and wide supply range, it is perfect for DIY electronics, robotics, and professional monitoring systems. A must-have IC in your IC’s collection.
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