Metra Electronics DAT Combo Manuel d'utilisateur télécharger pdf (Page 70)

aLam

i-n

et er

end

and a

female

socket

on the

other end

is

used

to

connect

the

ammeter

adapter

to

a

wall

outlet.

One

Use.

I had

no

sooner

finished

the

am-

meter

adapter

than

an

opportunity

came

to

use

it. A

two-

cabinet

stereo set

came

into my

shop with

the complaint

that it was

popping

fuses.

When

I checked

the units

I found

both

fuses

popped.

I

connected

each unit

to the

ammeter

adapter

and

found

that

each

unit

alone

drew

approximately

one

ampere.

Tap-

ping

the

tubes

in

the changer

cabinet

showed

up

a bad

5Y3GT

tube

that

caused

the

am-

P3

AC PLUG

FUSE

AC

SOCKET

J5

5 -WAY

BINDING

POSTS

J6

F

1

`i' J7

Adapter

circuit

is

simple

to

add

to

any

ammeter.

Fuse

protects

instrument

but

it will

not prevent

meter

overload

if

a

shunt

should

burn

out -use

meter

fuse

(see

ammeter

schematic)

of meter

rating.

meter

to

read

3

amperes.

Since

each

unit

should

have

had

a

1.5

ampere

fuse

to

start

with,

it was

easy

to

figure

why

the

fuse

had

gone. Further

examination

showed

that

the

blown fuse

in

the

other

cabinet

was

only

a

Bottom

of

adapter

shows

male

and

female

connectors.

Chassis

-mount

male plug

(on

left)

is

mounted

in

a shell

to recess

it

below

surface

of

adapter

box to

protect

pins from

damage.

Fuse

and

J6

at top.

ampere

size.

Proper

(11/2

ampere)

fuses

were

put

into

both

amplifiers

along with

a

new

5Y3GT

tube

and

no more

trouble was

found.

Monitoring

the current

for

short in-

tervals

over

a period

of several

days

showed

no

change.

Many

defects

in

electronic

equipment

can

be detected

with

an

AC ammeter.

Some

of

these are:

shorted

or partially-

shorted

power

transformers,

bad

tubes,

and bad

or leaky

filter

capacitors.

It

also

makes

it

easy

to

de-

cide what

size

fuse

to

put

into

newly

de-

signed

(and

built)

electronic

equipment.

A

safe

rule

-of

-thumb

is

to install

a fuse

rated

about

one

and

a

half

times

higher

than

the

operating

current.

Desk

Lamp

Mike

Stand

Record

that tall

story

using the

desk

lamp

reflector

to increase

pickup

range

A microphone

stand

for

hand

mikes (such

as

those

that come with

less

expensive

tape

recorders)

can be

improvised

from a flexible

neck

desk

lamp with its

cord removed

(or

at

least disconnected),

a plug to

fit the

lamp's socket, and

a'

/a x Via in.

metal

strip. Bend

the metal

strip to the

size

76

necessary

for the

mike

in question,

and

use

as

shown.

To pick

up

faint

sounds

attach

the

lamp's

bowl

-type

reflector

to

the lamp's

socket

to

"funnel"

or

focus

the sound

into

the

mike.

Face

the mike

toward

the inside

of the

re-

flector. Position

mike

closer or

further

from

the

bowl

for

best pickup.

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