Memorex CP8 TURBO UNIVERSAL REMOTE CONTROL Bedienungsanleitung PDF herunterladen (Seite 68)

100

Two

wires

are soldered

to the battery

contacts to

connect

the

batteries to the

alarm circuit. The

pack is

snapped

back

into

place

and the

wires

connected to the

alarm.

If the

equipment you'll be monitoring

is AC-

powered,

unplug it

and remove the back -up batteries.

If you'll be using

device

with

battery power

only, also remove the batteries

from it.

The next step is to locate

the metal contacts the

battery

or batteries plug into

push

against

within

the

equipment that's to be monitored.

The alarm

circuit

will be

wired

to those battery connections.

Connecting

the Alarm

[he alarm-

circuit enclosure

mounts

on the outside

of the

equipment case,

as shown

in the lead

photo. Two wires

connect the

alarm circuit

to the batteries,

so you'll

need to

drill two small

holes for

running the wires

from

the batteries

to the

alarm circuit.

Holes that

are

inch

in diameter

are

large

enough if you

use small-

diameter wire,

such as

28-

gauge,

to make the connections.

Carefully drill one

hole in the

instrument

case, in a spot

that will

provide

access to

the battery

compartment. If

the

batteries

are held in

a plastic drawer

that slides

into the case,

the

outside

wall

of the battery

drawer is

the place to

drill the

hole.

The

accompanying photo

(see

above) shows

that type of

installation.

Drill

a similar

hole in the Low -Battery

Alarm circuit's

case. Decide where

on the instrument

case

you

wish

to mount

the alarm,

then choose

a hole location

that offers

convenient

routing for

the battery wires.

Cut two lengths

of insulated

hookup wire

and strip %

inch

of insulation

from

one end of

each. Solder

wire

to each of

the battery

connectors

in the equipment.

After soldering,

tie a

strain

-relief knot in

the

wires

several

inches

from the soldered

ends. Then

push the free

ends of

the

wires

through the hole

the battery

compartment

and into

the hole in

the alarm-

circuit

case.

- TO

U1 PIN

VOLTMETER

(+)

VOLTMETER

(

Fig. 2-

Before final installation

of the low-

battery

alarm, use this

setup to test its

operation.

PARTS LIST

FOR THE LOW-

BATTERY ALARM

SEMICONDUCTORS

-8211 programmable

voltage

-level detector

integrated

circuit

U2- XRL555

TLC555

CMOS timer integrated

circuit

RESISTORS

(All resistors

are

1 4 -watt.

5 °0 units.)

R1-

36,000

-ohm

R2-

220,000 -ohm

R3-

68.000

-ohm

R4 -10 megohm

R5- 100.000

-ohm

ADDITIONAL PARTS AND

MATERIALS

C1- 0.1

-µF

ceramic disc capacitor

BZ1- piezoelectric

buzzer

(Radio

Shack #273 -065 or

equivalent)

Small case, perfboard, IC

socket (optional),

wire,

solder,

etc.

All components

except BZ1

available

from

Jameco Elec-

tronics, 1355

Shoreway

Road,

Belmont,

CA 94002.

Insert

the two ICs in the socket.

sure

to orient

them

correctly, and for

U2 observe the usual precautions

for han-

dling

CMOS devices.

Circuit

Check

-Out

Don't

solder

the hookup wires

to the alarm

circuit before

you

test the circuit's operation.

To do

that you'll need

a 1000 -

ohm potentiometer,

test leads,

and a voltmeter.

Check over

your

work

carefully. Then

refer to Fig. 2 for

the

test setup.

Use test leads to

connect the potentiometer

across

the battery or batteries

being

monitored.

Connect the wiper

the potentiometer

8 of

the battery

alarm,

and

connect

the

battery terminal

5 of

Ul. Set your

meter

measure

volts

and clip the meter

leads to pin

8 and pin

5 of

UI as shown.

You should

now

be able to turn

the buzzer off

and on by

adjusting

the wiper

of the pot.

When the

voltage

at pin 8 of

U I

falls

below

volts,

the buzzer should

begin

to sound.

Raise

the voltage

to 5.5

volts

and the alarm should

turn

off.

If you're

not

getting results,

monitor

the

voltage

pin 3 of

U I as you

adjust the

potentiometer

verify

that pin 3 drops

volt.

Check to see that

pin 4 of

Ul is

pulled

low

at this point.

that much

checks out.

inspect

your

wiring

at U2 for

correctness

and solid

connections.

Final

Installation

When

all looks

okay, you're ready

to connect

the batteries

directly to the

alarm circuit.

Measure

the length needed

for

the two hookup wires,

being sure to

leave enough slack

in the

wires

the batteries

can be removed when

necessary.

Cut the

wires

to size, strip %a

inch of insulation

from the ends,

and tie

another

strain -relief

knot in the wires

inside the alarm-

circuit

case.

Then with

the batteries

disconnected, solder

the

+ wire

the

battery case

to pin 8 of Ul ,

and

solder

the wire

5 of

UI. Use glue or

double -sided

tape to mount the

alarm circuit

case on

the equipment

case. And finally, insert

the back -up

batteries.

You can now free

yourself from dead

-battery

worries.

When

your

batteries begin to run

down, the low- battery-alarm

circuit will

be sure

to let you know.

1 2 ... 63 64 65 66 67 68 69 70 71 72 73 ... 99 100

Kommentare zu diesen Handbüchern

Keine Kommentare

Memorex CP8 TURBO UNIVERSAL REMOTE CONTROL Bedienungsanleitung Seite 68

Kommentare zu diesen Handbüchern