Marantz 5220 Manuel d'utilisateur télécharger pdf (Page 73)

value

from 10 to

47 kilohms.

With a

value of

10 kilohms,

overall

gain will

vary

from approximately

5

to 38 dB as

the

FET's

gate

voltage

is

shifted

from -0.5

to

-5.0

volts.

With

47

kilohms,

the

range

is from 20 to 52

dB using

a similar

control

voltage.

The

notch filter circuit

given

in Fig.

1B

employs

the

844/846

op amp

as a gyrator.

It

can

be used

in audio

test

circuits,

electronic

music

instruments, and

similar

applica-

tions. The

filter's center

frequency

is

determined

by

Cl,

ranging

from about

20

Hz

with

a 1.0 -pF

capacitor

to

2 kHz

with 0.0001

µF.

An

astable

multivibrator

and low

frequency square

-wave

generator

employing

the 844 are shown

in Figs.

2A and 2B,

respectively.

The two

circuits

are designed

for

operation

on

bipolar

15 -volt

dc supplies.

In

addition

to the op

amp,

the

square

-wave generator

utilizes

a pair of

zener

diodes

(Dl

and D2)

to provide

a clamped

output

signal.

In

both

designs,

the operating

frequency

is determined

by Cl.

Finally,

a sine -wave

oscillator

using

a pair of

846

op

amps

is

illustrated

in Fig. 2C. With

a specified

distortion

level

of

less

than 0.4

%,this circuit could

be

used

as an

audio -signal

generator,

as a

tone source

for

electronic

music, or

any similar

application.

The oscillator's

output

frequency

is

determined

by

R3

and

the values of

feedback

capacitors

Cl

and

C2.

If

0.47

-µF capacitors

are

used, the

minimum

and

maximum

frequencies

are

18 and

80

Hz,

respectively.

With

0.1 -µF capacitors,

the coverage

is 80

to

380

Hz, while 0.022

-µF components

will provide

a 38-

to

Fig. ?.

Au op amp

user' as an astable

mutiribrator

(A):

square -war+e

generator

(B); and

sirre -wave

generator (C).

B

C

R,

1MS'

OUTPU'

Chosen

for

oscillation

at

100Hí.

R

Cs

5pF

4---NA/V-8

R6

1042

646

I

150 p

MARCH

1976

Adjust Cs

for

frequency.

R5

106;2

VVh

R1

542

LOW

IMPEDANCE

OUTPUT

CLAMPED

OUTPUT

0, 6.2V

D2. 6.2V

LIPPING LEVEL

ADJUST

R?

20060

D,

7V

02

7V

R,

33042

CZt

--If

1F~

C11

R.

FRE.

OUENCV

ADJUST

50E

1612

[>i

C3 D3

1500E

104914

O

OUTPUT

number

one

ch

antennas by

a country

mile!

One

reason

why Antenna

Specialists'

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antennas

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the

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mechanic and

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'em.

Our

model

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Grip,'

for

instance. Solderless

connections.

No holes

to drill.

Clamps

to your

trunk

lid in seconds,

yet

it's a clean

permanent

installation

with cable

completely

concealed.

And if

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trunk,

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... all with

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long

life.

the antenna

specialists co.

ID-Stripes

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I

r,

e

rober

of The Alien Group

Inc.

F

j,Md

Ave

. Cleveland. Ohio

44106

ßr,0

Shames Drive. Westbury.

L I

_

NY 11590

Simmonds&

Sons. Ltd

"look

for

the

stripes of

quality"

CIRCLE NO 61 ON

FREE INFORMATION CARO

^ "J

I!

<./

81

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