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.

The sound level meter signal LM3915



 

Designation

 

Qty.

 

Description

C1

1

2.2 uF 25V electrolytic capacitor

R1

1

1K 1/4W resistor

D1

1

Silicon diode 1N4002

LED1-LED10

10

Standard LEDs or led array.

U1

1

LM3915 IC sound Level

MISC

1

Board, wire, socket U1



Notes:

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.

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