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067

Video Line Driver

This circuit is a video line driver specifically intended

for use with a single-ended power supply. As a matter of

fact, the synchronised outputs of a line driver for com-

posite-video signals go negative with respect to ground.

In order to be able to process these negative signals in a

circuit powered from a single-ended supply, it is neces-

sary to AC-couple the input of the opamp as well as

IC2

78L05

D1

1N4001

R4

C12

C11

C10

C9

100n

10µ

6V

100n

100µ

16V

R3

C4

C3

R6

1k

100n

10µ

6V

C7

100n

COMPONENTS LIST

C8 = 1000 µF 6V radial

C9 = 100µF 16V radial

IC1

C2

7

3

C2

R7

75 Ω

Resistors:

R1,R7 = 75

1

47µ

6V

Semiconductors:

D1 = 1N4001

IC1 = OPA353UA

IC2 = 78L05

Ω

R2...R4 = 4k Ω

2

1000µ

6V

7

4

OPA353UA

OPA535UA

R5,R6 = 1k

C1

100n

NC

1

8

NC

R5

Capacitors:

C1,C4,C5,C7C10,C12 =

100nF

C2 = 47µF 16V radial

C3,C11 = 10µF 6 V radial

C6 = 220µF 6 V radial

– IN

2

7

V+

Miscellaneous:

PC1-PC6 = PCB solder pin

Case, e.g., Hammond type

1590A

+ IN

3

6

OUT

R1

R2

C6

C5

V –

4

5

NC

100n

220µ

6V

004067 - 11

C2

004067-1

H2

(C) ELEKTOR

C3

C8

C4

C7

004067-1

R7

C12

C1

0

C11

D1

R6

C10

+

IC2

C9

H4

C5

C6

level-shift the signal in the positive direction.

The input is terminated into a 75

stage of the opamp that has been used here, and this of

course, has to be avoided.

Because we provided the circuit with its own voltage

regulator circuit (IC2), just about any mains adapter will

suffice for the power supply. The current consumption is

less than 20 mA. The construction of the line driver using

the accompanying printed circuit board layout is no more

than a simple, routine job.

resistor (R1). From

here, the signal passes through AC-coupling capacitor C2

and is applied to potential divider R2-R3, which provides

the necessary DC-offset. The shift into the positive direc-

tion amounts to +1.7 V, with the values shown in the

schematic. To avoid any misunderstandings we should add

that this value is fairly critical. Deviating from the values

shown can lead to distortion in the complementary input

(004067-1)

7-8/2001

Elektor Electronics

101

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