AEG Electrolux ERN 2922 User Manual download pdf (Page 46)

0 00

e

v a0

I c-tN, I

e

e

NE:

p

Fig.

3. Actual

-size etching- and -drilling guide

for logic,

synthesizer and

audio -amplifier

sections

of project.

front panel

along

with

the

LEDs.

If

you prefer to use an ordinary

slide or

toggle switch, it can be mounted

on

a

metal

subpanel,

made from

sheet

aluminum or steel

bent

into

an

L

shape,

inside

the enclosure. The

switch

will

be

reachable

only by un-

locking

the enclosure.

If you make

the

subpanel large

enough,

you

can

mount on it a barrier block at

which

the speaker

and sensors

connect

into

the

circuit.

Drill

mounting holes in the enclo-

sure

for

the circuit

-board assemblies,

power transformer,

speaker

jack,

LEDs piezobuzzer and

ARM /DISARM

switch. Make the holes for the LEDs

large

enough to accommodate panel

mounting

clips or small

rubber grom-

mets or just large enough to

provide

press fitting

of the plastic cases of the

LEDs, and drill a dozen or so holes

for

the sound from the buzzer and

speaker

to escape

if you mount

these

items internally.

You

also

need holes

for mounting

a three -contact

barrier block

or

three -position

screw

-type terminal

strip

for connection of

the normally

open

and normally closed

trip sen-

sors. Alternatively,

you can

replace

the speaker

jack and separate

barrier

blocks or

terminal strips for the

speaker and sensors

with

a single six -

position barrier

block to

which

all

external -device

connections,

except

those for

the ac power

cord, can be

conveniently made. Also

drill the en-

try

hole

for the ac line

cord and the

holes for mounting

the enclosure

to a

wall.

Mount

the power transformer in

the

enclosure, sandwiching a three -

lug

terminal strip (no lugs connected

to the mounting

tab) and toothed

lockwasher

between the

head

of one

of

the

screws and mounting tab.

Place

a

rubber grommet in

the ac line

56

/ MODERN

ELECTRONICS

/ February 1988 Say

You

Saw

It In Modern

Electronics

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 79 80

Comments to this Manuals

No comments