Home Projects Audio Sound Level Meter

 
 

Sound Level Meter
source: http://www.aaroncake.net/


 

 

This nifty sound level meter is a perfect one chip replacement for the standard analog meters. It is completely solid state and will never wear out. The whole circuit is based on the LM3915 audio level IC and uses only a few external components.

Schematic


 

Corrected schematic by "Eplanet"

 

Schematic for sound level meter

Original Schematic

Parts

 

Part

Total Qty.

Description

C1

1

2.2uF 25V Electrolytic Capacitor

R1

1

1K 1/4W Resistor

D1

1

1N4002 Silicon Diode

LED1-LED10

10

Standard LED or LED Array

U1

1

LM3915 Audio Level IC

MISC

1

Board, Wire, Socket For U1

Notes

1. V+ can be anywhere from 3V to 20V.

2. The input is designed for standard audio line voltage (1V P-P) and has a maximum input voltage of 1.3V.

3. Pin 9 can be disconnected from ground to make the circuit use a moving dot display instead of a bar graph display.

 

 
 

 

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