Marantz 5220 User Manual download pdf (Page 40)

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Fig. 1. The modem receiver

uses noise- reducing active

filtering

before its PLL

detector and delivers both

20-mA and

EIA- compatible

outputs.

Transmitter

accepts

either EIA or 20-mA

current to

modulate

two frequency,

two

-band oscillator. Also

shown

here are the power

supply

and active hybrid for direct

telephone -line connection.

U

H

N

~ W

>

S

(/1

U

H

o

oá

áo

Lt.

J

J

Q 7

2 +

y X

N

U

W

V)

J

w

a

K =

w

O

W

+

I

x

Iç

.n

a

0

J

v

ó

-

U

W

H

4 w

n

N =

W

ó

ó

S

t-UQ

¢=a

-cc

7U

U

nI-

W i2Y

0030

f-U'

X

f-OQ X=

2J0. f

n

1

r

N

Q Q z

O

H H -

z

L.1 Q

c

0

PARTS LIST

A I,A2,A4,A5,A8 -MC

I458

(dual 741 -

type)

operational

amplifier IC

(Motoro-

la)

A3 -565V phase -locked loop IC

A6 -4N26 optoisolator

A7 -555 timer IC

CI- 390 -pF, 5%

silver

-mica capacitor

C2,C7,C10,C12,C21,C25-

0.1 -.tF, 10%

polyester film capacitor

C3,C4-

0.0047 -pF, 10%

polyester

film

capacitor

C5,C 14,C 15,C22-

0.01 -.tF, 10%

polyester

film

capacitor

C6-

0.001 -pF, 10%

polyester

film cap-

acitor

C8- 0.033 -pF,

10%

polyester

film cap-

acitor

C9-

620

-pF, 5% silver

-mica

capacitor

C11- 1800 -pF, 5% silver -mica capacitor

C

13- 22 -pF, 25 -volt electrolytic capacitor

C16,C19,C20

-1 -1.1F, 25 -volt electrolytic

capacitor

CI7,C18-

470 -pF, 25 -volt electrolytic

capacitor

C23,C24-

270 -pF, 5%

silver

-mica cap-

acitor

DI

to D4,D9,DlO,D15

to D24

-

IN4148

low- leakage diode

44 POPULAR ELECTRONICS

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