Metra Electronics DAT Combo Manual de usuario descargar pdf (Pagina 110)

Tape

-Slide

Synchronizer

Continued from page

80

R1 and J2 are added

to the

PK -522

amplifier to make

this simplification

of

operation

possible.

Volume control

R1

is

set

to about

its

mid -range position

for

this

setup.

Shock Hazard

and Grounding.

The yel-

low lead of

the output

transformer

was

grounded

to

the

positive

(+

) battery

termi-

nal in the original PK -522

circuit.

To

completely eliminate

shock hazard

the

printed-

circuit foil

was

cut

leaving the

sec-

ondary ungrounded as shown

at

X in Fig.

2.

A

separate

transformer

power

supply

(T2-

R2

and

C3) provides

DC for

the amplifier

-

eliminating

possible shock

hazards

from this

source. To prolong

its life,

R3 is

used

to

reduce the light output

of the pilot

lamp.

The

value of

C3

must

be

at

least

1000

mf

as it holds the

power

supply

voltage on the

amplifier for good

operation, after

the

AC

supply to T2 has

been cut

off by the motor -

driven cam

switch (S4) in

the slide

changer.

Construction

Details.

Placement

of parts

is not critical.

And

using subassemblies

for

the

amplifier,

SCR switch and

the amplifier

power

supply

makes

for a

neat and

compact

unit

which

should

be

easy

to service

if this

should ever

be necessary.

The photo

of the under

side of the chassis

(Fig. 3) shows

the

location

of parts.

The

PK -522 amplifier

is shown fastened

to

the

right side

of the

chassis

box

on

3/a -inch

stand

-off insulators.

These can easily

be

made

from

test -lead

handles

or

banana -plug

insulators.

The SCR -diode

bridge switch

(SCR

I, Z1,

D1, R2

and

C4) is mounted

on

a phenolic

panel and fastened

to

the left side

of the

cabinet

with 1/2-inch

spacers.

The power

supply

(Z2 and

R3) is

mounted

on another

small

phenolic panel

which is then

attached

to the

bottom side

of

the

chassis

box

with

1/2-inch spacers.

T2

is mounted direct

to the

lower

side

of chassis

as shown.

Fig.

4

is a photograph

of the

Tape

-Slide

Synchronizer

and

shows,

in conjunction

with Fig.

3,

the location

of the

other

components.

Cables.

The

two -wire

power

cable

which

connects

the slide-

changer

unit

to the

Tape -

Slide

Synchronizer

has a

4- contact

plug

number

Jones

P-

304

-CCT on

one end

which

mates

with the

original

Jones

4-

contact

socket S- 304

-AB

on the

slide changer.

The

other

end

of the power

cable

has a

female

Jones cable socket

S- 304

-CCT

which mates

with

a

male

chassis

plug

P-

304

-AB on the

Tape

-Slide

Synchronizer.

The female

Cinch

-Jones chassis

socket

S- 304 -AB shown

on

the chassis

is not

essen-

tial unless the

original

remote pushbutton

cable

operation is desired.

The shielded

wire

connecting

the synchro-

nizer

unit

with the recorder

has a

miniature

phone plug on

one end

and

whatever

type

fittings needed (on

the other end)

to mate

with

the input

and output

of the particular

recorder

used.

Conclusion.

The Tape -Slide

Synchronizer

can

be

used

with

any

stereo

-tape

record/

playback

unit and

practically

any

remote

-

pushbutton-

operated

semiautomatic

slide

changer.

Adequate gain

is available

from

the

3- transistor

amplifier

to

operate

with the

preamps

of most

stereo

tape

decks.

Further-

more,

if desired,

a small

crystal

microphone

can

be plugged

into

the

synchronizer's

input

for

voice operation

of the

slide

changer

and

simultaneous

recording

of the

sync

signal

on

the tape.

Since

the

Tape

-Slide Synchronizer

is

all

solid

state

there

are

no relays,

contacts

or

moving

parts

to

wear

out.

This

unit

has been

in

service

for

nearly a year

and

has

required

no service

of any

kind to

date.

Perfect

synchronization

of

commentary

and slides

is

assured

at all times

because

the

sync

pulse

and

commentary

are

recorded

on

a

single 2 -track

tape.

International

Crystal

C -1

2B

Continued

from

page

58

"wo- o -of,"

or "hello-

o -o -o,"

the C -12B

indi-

cated

somewhat

in

excess

of

90%

modula-

tion.

The

actual

scope

value under

these

conditions

was 100 %.

Summing

Up.

The C -12B

frequency

me-

ter, functioning

as a

frequency

meter,

preci-

sion

signal

generator,

RF power

output

me-

ter, and

modulation

meter,

essentially

per-

forms

all

the

tests

required

to

insure

a CB

set

is

completely

legal in

its operation

and

that it

is performing

at

optimum

efficiency.

We

therefore

recommend

it

as

a

must -have

item for any

shop

doing

CB

servicing.

The C -12B

is

priced

at $300.00.

Additional

information

is available

from

Dept.

RF,

In-

ternational

Crystal

Mfg. Co.,

18

N.

Lee, Ok-

lahoma

City,

Okla.

73102.

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