Epson L90P - TM Two-color Thermal Line Printer Manual de usuario descargar pdf (Pagina 73)

PARTS/METHODS/IDEAS/GADGETS/DEVICES

tips&

techniques

HOMEBREW BATTERY

TERMINALS

Where space

isn't

at a premium,

AA battery

terminals such

as those shown

the

photo

can be fabricated

with the

aid

of a

spring,

some

stranded

wire, and a couple

of rubber

splice

caps.

The

small compression spring

(taken

from

old

record player

f r

o m m

o t o

brushes)

should

clean

and

free

rust.

Solder

length

of the

hookup

wire

one end

of each

1/4 " -%" long

spring,

and crimp

down the

other

end of

each spring

make sure

of good

electrical

contact

with

the battery's

terminals.

The

splice

caps

are

made by

Ideal ( #415).

To save

space,

cut off

the

thumb

tabs.

Then

punch

small

hole

through

the

splice

caps,

and

feed

the

hookup

wires

through,

pulling

on them

that the

springs

fit snugly

into the

narrow portions

of the

caps.

(To

identify the

cap polarities,

use a

red wire

for the positive

and

black

blue

wire for

the negative

terminals.)

Now,

fix

the

AA cell

place.

-Wendell

H. Arthur

HOMEBREW

TEST

PRODS

FROM

OLD

BALL

-POINT

PENS

Have

you

ever

wondered

what you can

with

those

old, dried

-out

hall -point pens you

have been

throwing

away?

you think

hard,

you will

see

one possibility:

they

make handy

test

prods.

Single

-piece

body pens

with brass

ink

cartridges

are

ideal

for

the job

(see photo).

Using

a pointed

tool,

lift

off

the

top

plug and push

out

the

ink

cartridge.

Then cut

off

and

discard

the part

of the

cartridge

just

above the

dimples in the

cartridge

tube.

Thoroughly

clean the remain-

ing

piece,

and

tin

the

interior of the tube.

Now,

string

the

test cable

through the pen

body,

insert

the bared

end of the cable

the

cartridge,

and solder

in place. Press fit the

point

back

into the pen

body,

leaving

about

14" protruding.

Finally,

gently

squeeze out

the

steel

ball

the pen

tip

with

side cutters,

and

round

off the tip.

A head of epoxy cement

the

other

end

of the pen body serves as

strain

relief for

the

test cable.

-A.

A. Mangieri

April,

1969

AUTOMOBILE

AIR FILTER IS

SOURCE OF

CHASSIS VENTING

MATERIAL

There

are still

some

circuits

and equipment

electronics

that must be

housed inside an

enclosed

chassis to prevent electrical shock

hazard but

require conventional ventilation to

guard against

heat damage. Unfortunately,

perforated

metal

sheets -ideal

for fulfilling

both needs

-are sometimes

not readily

avail-

able

electronic

parts stores.

However, if

you have an old dry

-type

automobile

air

filter

handy, you

have

ready

source of

this diffi-

cult

-to -find perfo-

rated aluminum

stock.

This mate-

rial,

which forms

the

outer

wall of

the

filter, can be

cut

to size

with

tin snips or

heavy

duty scissors.

Then all

you

have

do is place

the

cut piece

over

the

chassis

cutout,

bolt

it in place

with

machine

hard-

ware, and

you

have a

functional

cooling

grille

that

will provide

ventilation

while

keeping

the

hands of

the

user out

danger.

-James

D. Brenner,

Jr.

FLUORESCENT

LAMP

STARTERS

MAKE

THERMAL

SWITCHES

Need

inexpensive

thermal

switch

hurry?

Well,

if you

have

a spare

fluorescent

lamp starter

handy, you're

in business.

These

lamp starters

contain

ideal

miniature

ther-

mal switches

that

can be

used as they

are

modified

to suit your

needs.

First,

remove

and

discard

the

metal

shell

of the starter.

Then, carefully

clip

the

leads

the

glass -enclosed

ther-

mal switch (see

photo).

The switch

is normally

set

for

closure

about

150 °F.

If you

want

it to

at a

high-

lower

temperature,

you'll

have to break

the glass

envelope

carefully,

leaving the

base

intact.

Then,

for

higher temperature

action,

bend

the

bimetallic

elements

farther apart;

for

lower temperature

actuation,

bend them

closer

together.

find

the

correct distance

between

the

two

elements

for a given appli-

cation,

you'll

have to

use

trial- and -error

procedure.

-John

Rowe

BEWARE

SNAP CONCLUSIONS

Most people

-even

some professional electri-

cians-

assume

that the

small holes at the

ends

of the

prongs

on the common electric

plug

are

for temporary

cable splicing. Not

so!

They

were put

there

for

a purpose

the

days

when

we didn't

have springy

metals for

the prongs

hold them in position.

The holes

engaged

dimples

in the contacts

the

re-

ceptacle.

The

holes are obsolete, but tradi-

tional.

-Henry R. Rosenblatt

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