10 LEDs VU meter

Posted on Sep 8, 2012

The LM3915 is a monolithic integrated circuit that senses analog voltage levels and drives ten LEDs providing a logarithmic 3 dB/step analog display. LED current drive is regulated and programmable, eliminating the need for current limiting resistors. The IC contains an adjustable voltage reference and an accurate ten-step voltage divider. The input voltage can vary from 12V to 20V, but suggested voltage is 12V.

10 LEDs VU meter
Click here to download the full size of the above Circuit.

The high-impedance input buffer accepts signals down to ground and up to within 1.5V of the positive supply. Further, it needs no protection against inputs of ±35V. The input buffer drives 10 individual comparators referenced to the precision divider.

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