Metra Electronics DAT Combo Manuel d'utilisateur télécharger pdf (Page 64)

and

electronics

necessary

for straight

four

track

stereo

recording.

Focus

On

Features.

Among

the

many

features

of the

AD -16

are

three heads -for

simultaneous

playback

(monitoring)

while

recording;

an L- Stereo -R

mode switch that

permits

recording

on

either the L

or R

track

or

both; pilot

lamps to indicate the track(s)

in

the record mode;

a

built -in mixer

that

permits mixing

the signals

from the

micro-

phone

and

auxiliary input jacks; independ-

ent, friction

-clutched

controls for micro-

phone,

auxiliary,

and

output

level; two

stereo

(or mono)

headphone

jacks

that

can

accom-

modate

any

headphone

inpedance; two

am-

plified VU meters

that

monitor the input

and playback

levels. In short, the AD -16

boasts

every feature you

would

expect

to

find in

any

truly

professional (broadcast -

quality)

recorder.

The tape transport

is a three -motor affair,

with

one for

the

capstan, one for

the

supply

reel,

and

one

for the take

-up

reel. Pushbut-

ton- operated

solenoids, rather than complex

mechanical

levers, activate the appropriate

drive mechanisms. In

addition

to the usual

play, fast

forward,

fast rewind,

record,

and

interlock buttons,

there

is a cue

button

that

is perfect for

locating

a

specific spot

on

a

recording

and

for

doing professional -style

editing.

Putting it

Together. Except for the head

assembly, the entire

AD -16 is user-

assem-

bled. Building

the electronic

side of the

AD -16

consists

primarily of pushing compo-

nents

into

a printed circuit

board and

solder-

ing.

And putting the transport together is

not

notably

difficult

since solenoid operation

sharply reduces the

number of mechanical

components

and simplifies adjustment

of

those

which remain. The all-

important

head

assembly

is

pre-

mounted

at the factory to

insure that

tracks

are

properly

positioned

on

TAKE

UP

MOTOR

CAPSTAN

MOTOR

REWIND

MOTOR

POWER

CAPSTAN

INPUTS AND

OUTPUTS

TRANSFORMER

Bottom view

of

recorder

reveals input

and

output jacks

mounted

on

access plate, which

also contains

posts

for storing

line

cord.

the tape,

although

the

builder

must make

final

head-

azimuth

alignments.

A full set of

height

and positioning

adjustments

is pro-

vided

for

each

head

should the

need

arise for

head

replacement or

repair. The

instruction

manual goes

into detail

on this.

Pushbutton

controls

are

part

of

the

trans-

port

deck, as

is a

belt-

driven, resettable

revo-

lutions

counter.

A "tape

gate"

is

also part

of

the

transport

and

is pulled

in by

a

solenoid

in

the play, record,

and

cue

modes.

A

built

-

in tape

-break switch

(auto -stop)

doubles

as

a

supply -reel

compliance

arm,

and

a compli-

ance arm is

also

provided

for the take

-up

reel.

The

deck is completely operative

upon

completion of

assembly except for

the minor

spring

tension

adjustments.

Only setting

the

bias

current

and aligning the heads

re-

main, and Heath

provides

a

special

tape for

these

two

adjustments.

The tape

provides

(Continued

on

page 114)

TAPE BREAK

ARM

CAPSTAN

PUSHBUTTONS

PRESSURE

VU

METER

j

VU METER?

&

l

ROLLER

\

,_

PLAYBACK HEAD

70

g

RECORD HEAD ERASE

HEAD

Top view

of unit

shows

location

of heads, VU

meters,

and push-

button controls.

Use of push -

on

terminals

on

leads

to

and

from

head

and between

transport

and printed

-circuit

board

obviates need

for

soldering.

RADIO -TV EXPERIMENTER

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