Marantz 5220 Manuel d'utilisateur télécharger pdf (Page 32)

600X1

LIK

220

910

33X1

620

4311

ICI

MC3302P13

LEDI

64W

R17

471

LED2

32W

LED3

16W

R19

4711

LED4

BPI

R30

RIGHT

1131

CHANNEL

10011

BP2

BP3

*R32

LEFT

833

CHANNEL

10011

470X1

330

RIO

240

RII

11011

812

56n

IC2

MC3302P13

LED 5

LED6

LED?

LED 8

1/2W

IC3

MC3302P13

RI 3

12011

R14

82R

R15

5611

RI6

Ion

BP4

*411 = 3.61K I

CAN

5K,25K,

OR 50K POT.

811 = 10K

SEE

TEXT

1611. = 24K

BPI to

BP4 -Five

-way binding post (two

red, two

black)

C 1- 100 -µF,

25 -V electrolytic

capacitor

C2-

0.1

-pF,

100-V ceramic capacitor

C3- 10 -NF. 15 -V

electrolytic capacitor

to D4 -Diode

(1N4001 or similar)

D5 -Diode

(1N914

similar)

F1-

1/16 -A fuse and

holder

to 1C3

-Quad comparator (Motorola

MC3302P)

1C4 -5

-volt regulator

(Motorola

MC7805CP)

LED

I 1 -MLED 650(or similar)

Q1 to QIl- Transistor

(2N3906

HEP715)

CAN

IK POT.

PARTS LIST

Following

resistors are

Ih -W, 5% unless

otherwise specified:

R1 -600 ohms (see text)

R2,R28 -1100 ohms

R3-220 ohms

R4-910

ohms

R5-33 ohms

R6-620 ohms

R7-43

ohms

R8-470 ohms

R9-330 ohms

RIO -240 ohms

R11 -110

ohms

R12,R15

-56

ohms

R13

-120

ohms

R14-82

ohms

LED9

I/4W

LEDIO

I/8W

LEDIT

I/16W

ICI -IC3=

MC3302P

01- 011

= 283906

LEDI- LEDII=

MLED650

6.3V

R16-10 ohms

R17 to R27 -47

ohms

R29

-160 ohms

R30,R32 -See

schematic

R31,R33

-100 ohms

-Spst

switch

T1 -6.3

-V

filament

transformer (Stancor

P -6465

or similar)

Misc.- Suitable

cabinet, line cord,

grommets

for

LED's, press -on type,

mounting hardware,

etc.

Note

-The following

are available from

MITS,

Inc., 6328

Linn,

N.E.,

Albu-

querque,

NM 87108: printed

circuit

board only, $6.50;

complete kit of parts

including

pc board but not

case, $38.

Fig.

1. As

signal input

voltage

doubles, 11

comparators turn

on their associated

LED's.

across 4

ohms,

1/2

across 8

ohms,

and 1/4

across 16

ohms. Thus

the

same circuitry

can

be used for any

the

three

impedances

simply by

changing the

values

the input

resis-

tors

(R30

and R32).

About the Circuit.

The

input circuit

consists

of resistors R30 through R33,

diode

D5,

and an

filter consisting

of R28, R29, and C3.

The

filter has a

time constant of about

80 Hz. Resis-

tors

R31 and R33, in the

common ( -)

inputs,

allow

the

circuit to

be used

with

amplifiers that do

not have

common

ground for

both channels.

They

provide

low-

impedance refer-

ence for the

circuit but have no

effect

on the bias

the

amplifier.

Resistors

R30

and R32

reflect

a high

impedance to the

program

source

be-

cause their

values

are

insignificant

parallel with the few milliohms

of out-

put impedance of most

amplifiers.

These resistors take the

algebraic av-

erage of the

voltage

across each of

the

speakers,

which causes the power

meter

indicate the

average power

being

delivered by the amplifier.

This

could be extended

use on a

four -

channel

system

by adding two

resistors, with all

four

20,000 ohms

to maintain

5:1 ratio.

Diode

D5 prevents

the negative half

of the audio

signal

from bringing the

comparator

inputs below ground and

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Marantz 5220 Manuel d'utilisateur Page 32

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