This beautiful sound level meter is a perfect chip replacement for a standard analog meter. The entire circuit is based on the LM3915 's audio level IC, using very few external components.
schematic diagram
schematic diagram
Original schematic
Components
Comment
1. V + can be anywhere from 3V to 20V.
2. The input is designed for standard audio line voltage (1V PP) and the maximum input voltage is 1.3V.
3. Pin 9 can be disconnected from ground, allowing the circuit to use a moving point instead of a bar graph display.
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