lm 3915 sound level meter circuit


Posted on Feb 6, 2014

This is a one chip sound level meter that can be use for displaying sound level of an amplifier or simply the sound level from a microphone. The heart of the circuit is IC LM 3915 Audio level IC. Even though it is a stand alone IC, a peak detector based on Transistor BC 558 and diode 1N4001 is also included for better performance. Supply voltage ca


lm 3915 sound level meter circuit
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n be from 3V to 20V. The input is set for audio line voltage (1V peak to peak) and has a max input voltage of 1. 3V. To make the circuit use a moving dot display instead of bar graph display, Pin 9 can be should be disconnected from +V.




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