The sound level meter signal LM3915
This is great the sound level meter is an ideal replacement for standard analog sound level meter on a single chip. The scheme is secure and will not wear out )) the Whole scheme is based on LM3915 integrated circuit sound level and uses only a few external components.
2.2 uF 25V electrolytic capacitor
1K 1/4W resistor
Silicon diode 1N4002
Standard LEDs or led array.
LM3915 IC sound Level
Board, wire, socket U1
1. V + can be from 3V to 20V.
2. Input for standard audio line voltage (1V PP) and has a maximum input voltage of 1.3 V.