LM3915 Audio Display IC 10-Segment LED VU Meter Driver for DIY Amplifier

LM3915 Audio Level Indicator IC – LED VU Meter Driver IC – Product Description

The LM3915 is a precision audio level indicator IC widely used for creating LED VU meters, sound level displays, and audio visualizers. It senses analog audio signals and drives 10 LEDs, LCDs, or bar displays in a logarithmic scale, making it perfect for accurate visual representation of sound intensity.

This IC features an internal voltage reference, built-in LED drivers, and simple wiring, allowing hobbyists, audio enthusiasts, and engineers to build professional-grade audio level indicators with minimal external components.

Key Features

• Drives 10 LEDs directly (no resistors needed)
• Logarithmic scale (3 dB per step) for accurate audio display
• Low-power and highly efficient design
• Wide operating voltage range: 3V to 25V
• Adjustable reference voltage and LED current
• Dot or bar graph display mode
• Suitable for audio VU meters, spectrum analyzers, and sound level indicators
• Easy to interface with microcontrollers or analog circuits

Specifications

• Model: LM3915
• Type: Audio Level Indicator / LED Driver IC
• LED Outputs: 10 channels
• Scale: 30 dB logarithmic
• Operating Voltage: 3V – 25V
• Output Current: Adjustable (up to 30mA per LED)
• Reference Voltage: 1.2V (typical)
• Modes: Dot mode / Bar mode
• Package: DIP-18