Mitsubishi Electric MUX-25TV - E1 User Manual download pdf (Page 40)

Fig.

4. This

view shows

analog

circuit

board

layout on

perforated board

and

front -panel

component

mounting

details.

ICs are in

sockets.

former and the fuse

holder.

Use a

strain relief

to

secure the

line

cord

in

place about

4"

from

its free

end

in-

side the box.

Alternatively, line the

remaining hole with a rubber grom-

met

and

pass the line

cord through

in-

to

the

box

and

tie a knot,

leaving

about

4" of wire

inside

the box.

Connect and

solder one of

the

transformer's primary

leads

to

one

lug

of

the power switch

and a short

heavy -duty stranded

hookup wire

Fig. 5. Power

supply

board, transformer,

fuse holder and power

switch

mount

on

rear

panel. Secure

the line cord as explained

in the

text.

Resistor Values

Frequency

(Hz)

Value

(ohms)

Frequency Value

(Hz)

(ohms)

20 1.515M

8k 3637

40 757.42k 10k

2880

80

378.64k

12k 2375

100 302.88k

14k 2014

400

75.607k 16k 1743

800

37.728k

17k 1632

1k 30.153k

18k 1533

2k

15.000k

19k 1444

4k

7425 20k 1365

6k

4900

Resistor

values for some typical frequen-

cies.

Select

10 frequencies that best suit

your

needs.

The values

shown

in this table

were

selected

for

a

0.033 -µF

value for

tim-

ing capacitor

CI.

from the

other

lug

of

the power

switch and

one lug of

the fuse

holder.

Connect and

solder one

line cord wire

to the

remaining

lug

of the

fuse

hold-

er.

Though

Fig. 3 does

not show it

(the photo

in

Fig. 4 does), you can

use

the second

pair of contacts

of a dpdt

switch

to

make

and

break

the lower

line

in the transformer

primary

cir-

cuit simultaneous

with the

make/

break action

of the fused

line. If

you

do,

connect and solder

the other

line

cord

wire to one

lug of the second

switch

section and

the remaining

transformer

primary read to the

oth-

er

lug. Otherwise, twist

together

the

line cord

wire and

primary

lead and

screw

onto the connection

a wire

nut.

Mount the front -panel

compo-

nents and

the

analog

circuit board

on

the floor of

the box. Referring

to

Figs. I and

4,

carefully

wire the con-

trols, switches

and

LED into the cir-

cuit.

When you are finished

wiring

the project, carefully

go over

all

your

wiring, particularly

in the power

sup-

ply,

to

make sure that everything

is

okay before

you power

the project.

Adjustment and

Use

Set all controls

to

mid -rotation and

46

/

MODERN ELECTRONICS

/ April

1986

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