Lm3915 Ic. Ic lm3915 is an 18pin monolithic integrated circuit that senses the analog signal voltage levels and accordingly drives 10 leds bar or dot matrix display. Nsc alldatasheet datasheet datasheet search site for electronic components and.
Many simple circuits are available on the internet related to the audio led visualizer. If you re wanting to make a vu meter you should use the lm3916 which we will cover in the final instalment of this trilogy. The lm3915 is a monolithic integrated circuit that senses analog voltage levels and drives ten leds lcds or vacuum fluorescent displays providing a logarithmic 3 db step ana log display.
The lm3915 offers a simple way to display a logarithmic voltage level using one or more groups of ten leds with a minimum of fuss.
Lm3915 vu meter pcb layout which is an 18 pin led driver ic is well developed by the company and working with the range of 30db. It can drive both 10 segment bar led and dot matrix led. Inidicating devices likes leds lcd or vaccum displays can be attached with these outputs to obtain a corresponding visual indication in response to the varying input analogue signal. One pin changes the display from a bar graph to a moving dot display.
