10 LED Sound Level Meter

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This is sound level meter for your hand made audio device. This circuit will display like spectrum in Jet Audio software.

10 LED Sound Level Meter circuit diagram

Supply voltage can be from 3V to 20V. The input is set for audio line voltage (1V peak to peak) and has a max input voltage of 1.3V. To make the circuit use a moving dot display instead of bar graph display, Pin 9 can be should be disconnected from +V.

Parts List.



C1
C2, C3
R1, R3
R2
R4
R5
D1
Q1
LED1-LED10
U1
MISC
2.2uF 25V Electrolytic Capacitor
0.1uF Ceramic Disc Capacitor
1K 1/4W Resistor
10K 1/4W Resistor
100K 1/4W Resistor
1M 1/4W Resistor
1N4001 Silicon Diode
BC 558 PNP Transistor
Standard LED or LED Array
LM3915 Audio Level IC
Board, Wire, Socket For U1


1 comments so far

Voltage ? 12 V ?