Memorex CP8 TURBO UNIVERSAL REMOTE CONTROL Instrukcja Użytkownika Pobierz pdf (Strona 57)

100

This is the voltage

inverter. Small

pieces of metal tubing

have been

placed over

wire terminals

to improve their

visibility. Be sure that all connections

are

insulated.

leads

especially. You

will

find

that the construction corre-

sponds to the

description given above.

The

Voltage Inverter

Now look at the small, shiny, black plastic box. That is the

voltage

inverter, the purpose of

which is

change 6 volts DC

to about 140

volts

AC at 400 Hz. Tùrn the inverter upside-

down. You

will

see a total

of three

very

short

wire

terminals

forming a right angle. Place the 90 degree corner of the angle

to your lower left.

The

terminal

situated directly to the right is

the low-

voltage

positive DC input. The terminal up and

the

left is high -voltage AC output. The

wire

in the middle, at the

corner of the angle, is common.

The positions of those

terminals are illustrated in Figure 2.

You can run the

voltage

inverter

with

an electronic

power

supply or a battery.

cool,

gentle, green glow from the glow

strip was obtained

with

a 6 -volt Eveready

Lighting Battery

(No.

510S). Smaller batteries

will work

too, but not quite as

well. Experiment with the type of power source

and voltage

until

you

get the effect

you desire.

140VAC

OUTPUT--

400Hz

140VAC

OUTPUT

400Hz

6VDC

INPU-

INPUT

NEGATIVL

POSITIVE

Fig. 2 -This diagram

will allow

you to identify the

terminals on

the voltage

inverter.

Check

the connection

for

proper battery polarity.

The inverter can be used in a number

interesting projects,

including high

-voltage

generators.

This unusual effect

was obtained by placing

a glow strip

under a large

lump

rough glass.

You will

enjoy

coming

up with interesting uses of

your own

for the

glow

strip.

INVERTER

GND

TO DISPLAY

Fig.

Wiring

the inverter and the strip will

perhaps

make this the easiest project you've ever built. You

need

not

stick

with using

a six

-volt battery, but don't go

lower.

There yet are

other ways

of energizing an electrolumines-

cent specimen. In one interesting

experiment, G. Destriau,

working back in

the

1930s,

found that, instead of an alternat-

ing

voltage,

was

possible to produce light by rotating an

electroluminescent

sample

in a constant electric field. That

changes the direction of the

electric

field

relative

the axes

of the phosphor

crystals.

The faster

the rotation of the sample,

the brighter the

electroluminescence that is produced by the

glow strip becomes.

Precautions

Electroluminescent devices seem to work best at or near

room temperature. And like

all electronic components, they

should be kept away

from heat

to avoid possible damage. As

the ambient temperature rises, electroluminescent efficiency

begins

fall,

as the

increasing rate of

atomic

vibration within

the phosphor crystal takes up more and more of

the

input

energy.

Also, do not be deceived by the small size of the

voltage

inverter. It can

deliver

a fairly strong shock, so please be

careful.

For further information on

electroluminescence,

see chap-

ters 8 and 17

of M. A. Mardens'

Lamps

and

Lighting (Lon-

don, Edward Arnold,

1983).

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