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Photometer

Photometer

IC1

LM3915

13

22

14

15

16

17

18

4

7

6

8

2

12

5

COM

IC1

7806

3

1

IN

2

OUT

+

+

LED7

R1

1K

D1

PHOTO-

DIODE

VR1

100K

C1

47μ

25V

R2

5.6K

VR2

10K

C2

0.1μ

9V

DC

LED1-LED3 = RED LED, LED4 = YELLOW LED, LED5-LEDLED7 = GREEN LED

C3

0.1μ

C4

10μ

25V

S1

ON/OFF

SWITCH

LED6

LED5

LED4

LED3

LED2

LED1

Photometer

1
0
0
publish time: 2020-09-29
Circuit Everyday

When reading and working at close distances, 100 to 1000 lux of illumination is required for eyes and fatigue. Mirror lighting or bright sunlight can provide 50,000 lux of light, while twilight or dark light only provides 10 lux. It is better to read or work under a fluorescent lamp, because its flux is 4400 lumens compared to the 1600 lumens of a tungsten lamp. If the eyes are exposed in a darker environment for several hours, dark adaptation will be formed and the eyes will feel severely fatigued.

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