This nifty sound level meter is a perfect chip replacement for a standard analog meter. The entire circuit is based on
the LM3915
audio level IC and uses only very few external components.
Reference address：Principle of Sound Level Meter
Schematic diagram
Schematic diagram
Original schematic diagram
Component
Notes
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 to make the circuit use a moving dot instead of a bar graph display.
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