Mitsubishi Electric MUX-25TV - E1 User Manual download pdf (Page 62)

ELECTRONICS

NOTEBOOK...

voice

reproduction

will

influenced by

the dimensions

of the transmitter

and

the

amount

of ambient sunlight

reaching the

solar cell.

For

best

results,

the sun should

be behind

the receiver

and the

receiver

should be

in a shady spot.

You

can

easily experiment

with the ba-

sic

photophone

concept

presented

in Fig.

For example, add an

equalizer

the

output of the amplifier

to enable

the

re-

ceiver to enhance

the quality

the re-

ceived signal.

Or try different

-size

trans-

mitter tubes and

reflective

materials to see

which

combination

works best.

I've made

many kinds of

photophone

transmitters

and

receivers. The smallest

transmitter

1 " length of

1 "- diameter

aluminum

tubing. An ultrathin glass

mir-

ror is cemented to one end.

I've even

made

transmitters

by taping a flat sheet of

aluminum foil or aluminized Mylar

over

circular opening cut

flat piece of card-

board.

As for receivers, I've used many differ-

ent

kinds of detectors and amplifiers.

The

most

ambitious

uses an

"- diameter

glass parabolic

reflector installed in a

wood

cabinet assembled

for the purpose.

A folding -arm assembly permits a solar

cell to be placed at

the focal point of the

mirror when

the cabinet

is opened. A

transistor amplifier and

speaker are

in-

stalled inside the cabinet.

For complete

construction details,

visit

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are the

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ELECTRONICS,

the

monthly

magazine for electronics

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enthusiasts.

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your present

equipment

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ELECTRONICS

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/ MODERN

ELECTRONICS

/ April

1986

find the February

1976 issue of Popular

Electronics

(pp. 54 through 61).

experiment

Otis

Imboden and

once conducted

will give you an

idea of

the

versatility of the photophone

con-

cept. Otis

is a photographer

for

National

Geographic

magazine

who

often

photo-

graphs both

gas and

hot -air passenger

carrying

balloons.

When the two

of us

were in Albuquerque,

photographing

hot

-air balloon

competition,

I showed

Otis some

my photophone equipment.

Being an

innovator, Otis suggested

using

as a photophone

transmitter one

of the

large

foil-

covered

reflectors he brought

along

to brighten

up the passengers

in the

baskets of

hot -air balloons

he was photo-

graphing. I gave a

receiver to the pilot

of a

tethered balloon,

and Otis

managed to

speak to

her by means of sunlight

reflect-

from

his

giant

photophone transmit-

ter. Though I don't

know if it

was

ever

tried

before,

the

combination

those

two

technologies could

have been used

establish

ground -to -air communications

a century ago.

How much

range

will

a photophone

sys-

tem

give? A

simple

system using

a solar cell

receiver

will

easily

give a range

of up to a

few

hundred feet.

For more

range it's nec-

essary

to use a

lens at the

receiver or to do

Bell

did

and use a

focused beam of sun-

light to provide

light for the transmitter.

In any case,

it's

very important that

the

person

at the

receiver end

wear

dark

sun-

glasses

and

avoid staring

at the bright

re-

flection

of sunlight

from the transmitter.

Staring at

the beam for even a

second or

will cause a scotoma,

a temporary

after

image that

leaves

blind spot

in the field

vision. Staring at

the reflected sunlight

for

more than a few seconds

may cause

temporary or even

permanent damage

the

retina of one or both

eyes.

Going

Further

Many electronics

books describe

applica-

tions

for audio

amplifiers.

I've described

several

applications

in The Forrest

Mims

Circuit

Scrapbook

(McGraw

-Hill, 1983).

much better source

Calvin

R. Graf's

Listen

to Radio

Energy,

Light and Sound

(Sams,

1978).

Cal's book

describes

doz-

ens

of experiments

you

can

perform

with

battery

-powered

amplifier.

Say

You Saw It

In Modern Electronics

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 83 84

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