August 02, 2009

Sound Level Meter

introduction:-
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. This circuit can also be integrated into audio amp projects.

Diagram:-

Schematic for sound level meter

click on the picture for better view..............

Parts:-

Part
Total Qty.
Description
Substitutions
C112.2uF 25V Electrolytic Capacitor
C2, C310.1uF Ceramic Disc Capacitor
R1, R321K 1/4W Resistor
R2110K 1/4W Resistor
R41100K 1/4W Resistor
R511M 1/4W Resistor
D111N914 Silicon Diode
Q112N3906 PNP Transistor
LED1-LED1010Standard LED or LED Array
U11LM3915 Audio Level IC
MISC1Board, 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 +V to make the circuit use a moving dot display instead of a bar graph display.

2 comments:

Nice circuit designed and thanks for the information that you shared it will be helpful to all.

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Electronics is the study and use of electrical that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves. and semiconductors. The pure study of such devices is considered as a branch of physics, while the design and construction electronic circuits to solve practical problems is called electronic engineering.

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