Metra Electronics DAT Combo Bedienungsanleitung PDF herunterladen (Seite 49)

PARTS

LIST

B1 -7 -volt

mercury battery,

Mallory (Allied

55J886

or

equiv.)

C1

-2

-mf, @

6 -volt DC

C2- 10

-mf,

@

12 -volt

DC

C3, C4- 500

-mmf ceramic disc

C5- 2.7 -30 mmf,

trimmer

capacitor

(Arco 461

or equiv.)

C6-5

-mmf silver mica

L1-see text

M1- Tie

-Clasp Microphone,

(Lafayette 99C-

4567

or equiv.)

01- Transistor, Motorola

HEP 251 (from AI'ied)

02- Transistor,

Motorola

HEP

52

(from Allied)

R1 -4700

-ohm, 1/10

-watt resistor

R2-

330,000

-ohm, 1/10-watt

resistor

R3-

10,000

-ohm, 1/10-watt

resistor

R4 -47 -ohm,

1/10-watt

resistor

R5- 100,000

-ohm,

1/10-watt

resistor

R6-470

-ohm, 1/10-watt

resistor

Misc.

-Plastic

cabinet, (Lafayette

13C3801);

pert- board; terminals,

wire,

solder, L-

brackets, machine

screws, nuts,

etc.

Estimated

cost: $7.00

Construction time:

2 hours

on -on

switch. To start

the

transmitter you

simply

clip in

the

battery.

To turn

the unit

off you

remove the battery.

The specified

battery will

give an

average

of

35

hours serv-

ice, depending on the

"freshness"

and fre-

quency

of

use. Since

there is

no standard

battery holder you have

to

make

your

own.

The

battery

holder

is

simply

two

L- brackets

fashioned from scrap

aluminum (an

old

Minibox)

or copper. The L-

brackets

are

mounted

to the board

with

2 -56

machine

screws. Connection

is

made

to

the

clips by

soldering directly to the

head

and nut. Note

Circuit is simple

but

you must remember

that wiring

at

100

MHz

is

critical

-all

leads to

Q2

and L1

-05 mu3t

be kept short

to get proper operation

on

the

FM band.

that

the

negative

clip has

a

hook

at

the end.

The battery's

negative

terminal is slightly

recessed into

its case, so to

insure connection

you must

form an 1/2-inch "hook" which will

bite into

the negative battery

terminal.

The Mike

and

Antenna.

The mike is

sup-

plied

with

a

mini -plug.

Cut off the

plug, un-

braid

the shield -forming

a

tinned

twisted

lead

with

no free

strands -and solder

the

mike cable

directly to

a ground terminal and

the

input to Cl. The

antenna consists of 12

inches of

very

-thin

stranded wire-

AWG

-22

or thinner

-soldered

to

Lt's

free end.

Drop

the unit into the plastic

case, leaving

the hinged

cover open. Mark

the

points

where

the mike

and antenna leads

will

pass

through

the case. Remove

the

transmitter

and

quickly

press

a

hot soldering

tip

into

the

edge of the

case at marks

for

the mike and

antenna leads. The

case

will

melt under

the

iron,

forming the openings

for

the two

leads.

Don't press

down hard or you'll

go

(Continued on

page 114)

C5

02

R6

C3 C2

Tight -wound portion

of

L1 is

a

loading

coil

for

the short antenna

-the spread

portion

tunes with

C5. Leads

that

connect

to the

base, emitter

and collector

of

02

should

be

kept

as short as

possible

(a normal

VHF

wiring

technique).

Those

to

01 aren't as

critical.

Transparent

plastic

box protects

delicate parts

-specially L1

and

C5 -from

damage.

FEBRUARY-MAUI!.

1967

53

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