Elenco Electronics MO-1251 Manual de usuario descargar pdf (Pagina 12)

100

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LEAhS"

sEE

rEx

FIG.

the

signal from

the wiper of the

potentiometer

which will allow

you

to use the

volume control

regulate the level at the

ear-

phones.

If you

can't

physically

get at the

volume control

(or if it would

re-

quire taking

the entire

set apart),

you can also

take the sound

from

the speaker

connections.

That

would, of course,

also allow

you to

set the

volume with the

TV set's

volume control.

Most

sets

have an

interlock

the

power

cord to

make sure

that the set

disconnected

from

the

wall whenever the

back

is re-

moved; but

make sure that

the

plug is removed

from the wall be-

fore you take the back

off the set.

Some

of the

voltages in a TV set

are

lethal levels and,

unless you

know exactly

what you're

doing,

playing

around

inside the cabinet

with the power

connected

good way to

risk getting fried.

When you decide

to monkey

around

with a

set,

it's also a

good

idea to

wait until the

set's

been off

for an hour or

so.

There

are some

big capacitors

inside

and

you

want to make sure

every-

thing's been

discharged

before

you go sticking

your

hands

there.

You can experiment

with the

three

methods

I've

described

and

see

which works best

for you.

Al-

though

it's probably easiest

to take

the

sound

from the speaker,

aware that

some TV audio power

amps

don't

have one side

of their

outputs

tied to ground.

You can

check that

by turning

your

TV off

and

testing

for continuity

between

the

chassis

and the

speaker

leads.

If the

amp

in your set

floats the

outputs

and

the

TV housing

(on

which

you'll

mount the earphone

jack)

is plastic, you

can

still

pick

the sound

off

the speaker

leads.

If,

however, your

TV is housed in a

metal case and there's

no con-

tinuity

between one side of

the

speaker and ground, you'll

have to

take the

sound from the

volume

control;

that's because grounding

one

side of the speaker

may

damage the output

stage of the

audio amp.

Whichever

method

you

choose,

the wiring setup will be exactly the

same.

You'll have to break the con-

nection

the

set and

wire the

jack so

that the sound

always

routed through the contact switch

the

jack.

You'll need the capaci-

tor and jack as shown

in Fig. 2. You

FROM

O-1

/O,vF

GRO

UNDO

FIG.

can

use any type of

jack (it really

depends

on your earphone's

plug),

but

make sure that you get

the ones with a built

-in switch.

That's really all there

is to it. Drill

hole in the cabinet at

a conve-

nient

location, mount the jack,

and you'll

be able

to listen to the

TV audio

without bothering

any-

one

else in the room.

R -E

It's

very realistic -it has a

built -in 20 -min-

ute delay for takeoff.

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 99 100

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