LM3915 audio power level meter circuit design electronic project

Posted on Feb 7, 2014

using the LM3915 monolithic integrated circuit can be designed a very simple audio power level meter that senses analog voltage levels and drives ten LEDs, LCDs or vacuum fluorescent displays, providing a logarithmic 3 dB/step analog display. One pin of the LM39145 changes the display from a bar graph to a moving dot display. LED current drive is

LM3915 audio power level meter circuit design electronic project
Click here to download the full size of the above Circuit.

regulated and programmable, eliminating the need for current limiting resistors. Replacing conventional meters with an LED bar graph results in a faster responding, more rugged display with high visibility that retains the ease of interpretation of an analog display. LED brightness is easily controlled with a single pot.

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