Epson L90P - TM Two-color Thermal Line Printer Manual do Utilizador descarregar pdf (Página 75)

the

product

gallery

REVIEWS AND COMVENTARY

ELECTROLIC

GEAR

AND

COMPONENTS

TERADO

TRAY- ELECTRIC

(Power Source

Model

50 -160)

Most

inverters

(12 volts d.

c. to

115

volts

a. c.)

for

emergency,

camping

or standby use

suffer from one

major deficiency:

What do

you do with

the cumbersome

wet

battery?

If the

inverter

is a separate

unit and you

operate

from the battery

in your car,

there is

a natural

limitation on portability.

Not

every

occasion when

you want

to use an

in-

verter

within

-15

feet of your

parked

car.

Obviously,

the answer

is a unit

with

self- contained

portability

-just

like the

Ter

ado

"Tray-

Electric" ($79.50).

Portability

an inverter

supply

not

new, but

Terado has accomplished

it in

sensible

fashion.

About 10 years

ago, an

Ohio manufacturer

put

a full -size

car bat-

tery

in a

metal case with_the

necessary

elec-

tronics

to charge

the battery

and invert the

voltage

c. The

idea was

respectable,

but

it took

two men

to lift the clumsy

case

and

jockey

it to a campsite.

The "Tray-

Electric"

appears to us to

achieve an

ideal balance

between one man/

one

hand

portability

and

battery capacity.

The secret

-if

there is one -is in

the use of

25-

ampere

-hour,

-plate

so- called garden

tractor wet

battery.

It is the result of today's

advanced

battery

technology, which has

reached

the point where

a physically

smaller

wet

battery

can practically do

the same job

that its big brother

weighing

twice as much

did a decade

ago.

When you

buy

the

"Tray-

Electric" the

battery

is dry.

You fill the

battery to the

designated

fluid levels

using electrolyte

sup-

plied by

the manufacturer.

The battery is

then brought

up to full charge from a

117

volt

a. c. line. Charging

is at the trickle

rate

(maximum

amperes)

and gradually

tapers

off to a couple

milliamperes.

is impossible

to overcharge the battery.

How

Much, How

Long? As

in most in-

verters,

the

efficiency of the

"Tray-

Electric"

is inversely

proportional to the

size of the

load.

Although your reviewer did not make

extensive

tests, it

appeared

that the 100 -watt

drain

efficiency level was about 75% and

the

-watt

drain about 60%.

test using a

-watt light

bulb as the only load, the bulb

remained

at full brightness

(actually some-

what above)

for a period of 8

hours.

check

the

output voltage

showed

drop

of only

volts during

the 8 hours.

were pleasantly

surprised

at the per-

formance

of the "Tray- Electric"

with a

black-

and -white

portable

receiver.

There

was no

loss of picture

size or evidence

instability

test lasting

hours.

Circle

No.

90 on

Reader Service Page 15 or 115

SQUIRES-

SANDERS

ULTRA

/MONITOR

Not

everyone who has a police

/fire

Business

Band receiver

is a "knob

jockey"

easily

satisfied with a product

of minimal

selectivity,

dubious sensitivity

and

near -

perfect image-

frequency

reception. Unfor-

tunately,

the

marketplace

is flooded with

low -cost

imports that

exactly

fit

those

speci-

fications and

many citizens

with the proper

need

for VHF receiving

equipment have

been

bilked and are disillusioned.

Testing

the new

Squires- Sanders

Ultra/

Monitor was

like getting

a breath of fresh

air.

Here is

a receiver that behaves

like a

piece

of professional

equipment

and can do

an excellent job

for

anyone needing

1- to

channel

crystal

-controlled reception

in either

the

high or low VHF

bands.

retail

price

the Ultra /Monitor has

not been

set

press

time, but it will probably

be around

$150.00

(with crystal

and tuned module

for

one channel).

Each

additional channel

will

require

separate module, which will

sell for

about $30.00.

Unusual

Features.

The Ultra /Monitor an

all-

solid- state, narrow

-band FM

superhet

using

appropriate MOSFET's

and

an IC

limiter quadrature detector

/first audio

amp-

lifier,. Selectivity is optimized

for

VHF

re-

(Continued on page

113)

(See photos

both products

two

pages)

April, 1969

1 2 ... 70 71 72 73 74 75 76 77 78 79 80 ... 115 116

Comentários a estes Manuais

Sem comentários

Epson L90P - TM Two-color Thermal Line Printer Manual do Utilizador Página 75

Comentários a estes Manuais

Manuais e produtos relacionados com Digitalizar e Imprimir Epson L90P - TM Two-color Thermal Line Printer