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LPT 1
D 1 14 2 15 3 16 4 17 5 18 6 19 7 20 8 21 9 22 10 23 11 24 12 25 13 1

74LS05 D 2 1 2 3 4 3 4 5 6 5 6 SDA SCL Power control work / NOT work +5v permanent GND C

C

7 pin 74LS05

14 pin 74LS05 B

B

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1k

4.7 k 0.1 mF

A

A

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