5

5

4

4

3

3

2

2

1

1

D D

C C

B B

A A

VCC

VCC

VCC

U1E

74HC14

1110

74HC14

56

R2

330K

74HC14

12

C2

CAP

-

+

U2

OP-741

3

26

74

R6

15

0K

R5330K

R3

330K

J2

HEADER 2

1 2

U1F

74HC14

1312

D1

DIODE

74HC14

98

R4330K

R8

3.3K

J3

HEADER 2

1 2

D2

DIODE

74HC14

34

R7

3.3K

R9

3.3K

RXDRTSTXD

DTR

GND

J1A

RS232

1

2

3

4

5

6

7

8

9

R1

330K

C1

CAP

J4

HEADER 7x2/SM

2468

101214

135791113

TXD

TCK RST_232

RST_232TXD_232

DTR_232

TXD_232

RST

RXD

TCK

RST

RXD

RXD_232

TXD_232

DTR_232

TXD

DTR_232

RXD_232