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Noise Meter

Noise Meter

IC3

LM3914

18

17

16

15

14

12

11

2

4

3

9

6

7

8

13

10

5

1

COM

IC1

7809

1

3

OUT

2

IN

3

2

7

4

6

-

+

IC2

CA3130

+

+

+

+

+12V

GND

C1

1000μ

25V

COND.

MIC

R1

10K

C4

0.22μ

R2

12K

R4

10K

C5

4.7μ

25V

VR1

1K

D1

1N4148

D2

1N4148

C6

16V

R6

27K

C7

2.2μ

16V

LED1

LED1-LED4 = GREEN

LED5-LED7 = YELLOW

LED8-LED10 = RED

R3

10K

C3

0.1μ

C2

0.1μ

R10

5K

+9V

R9

1K

D3

1N4001

PZ1

PIEZO

BUZZER

T1

BC558

R8

4.7K

R7

10K

LED10

R5

10M

PZ1

Noise Meter

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publish time: 2020-09-24
Circuit Everyday

Noise pollution often causes many non-communicable diseases, and noise higher than 30 dB is regarded as safe noise. The following is an interesting "noise meter" circuit for measuring the noise level indicated by the LED. In addition, a warning will be given when the noise is greater than a safe value of 30 dB.

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