Epson L90P - TM Two-color Thermal Line Printer Manual de usuario descargar pdf (Pagina 92)

computer

to

work to solve

the problem. Af-

ter

reducing

the

original

list to

15,000 "most

-

popular"

types, and

supplying

performance,

cost,

and availability

information,

the com-

puter came

up with a selection

of

285

small

-

signal

and power transistors

(both

germani-

um and silicon),

diodes, thyristers,

recti-

fiers, regulators,

light

sensors

and

resistors

which

were

then designated

as

"preferred

semiconductors."

When the

smoke

cleared,

all

this

information

was

bound into

a catalog

which

is

being made

available to

design and

standards

engineers and

purchasing

agents,

who write

in on their company

letterhead.

The address

is

Texas

Instruments,

Inc., Tech-

nical Information

Services,

MS308, P.O. Box

5012,

Dallas, Texas 75222.

Transitips.

Realizing

that

excessive heat

may destroy

semiconductor

devices, most

hobbyists

are careful

when installing

tran-

sistors,

diodes,

SCR's,

and similar pre -tin

terminals,

and complete

each

operation

as

quickly as possible.

But circuit

disassem-

bly, whether

for repair,

test, or equipment

modification,

can

pose unique problems, es-

pecially

if

the project

is assembled

on

an

etched circuit

board.

Quite often,

a perfectly

good

semicon-

ductor

device

is

damaged when

it

is

re-

moved

from its circuit board

for tests.

The

worker, finding

the

unit defective, concludes

that he has

isolated his circuit

defect

and

is quite puzzled when

the equipment

con-

tinues

to malfunction

after the "bad"

de-

vice

is

replaced

with a new

unit.

Amateurs,

hobbyists, students,

and be-

ginners are not the

only ones who

may en-

counter

this problem.

Professional

techni-

cians, "old-

timers,"

and even

design engi-

neers have

been victims

from

time to

time.

The

solution, of

course,

is to avoid possi-

ble heat

damage by

exercising

as much care

when removing

semiconductor

components

as

is used during

initial

installation of the

devices.

Several

manufacturers

have introduced

distinctive

tools

for solder

removal.

Ungar,

for example,

offers a unique

device

which

combines

a

heating

element with

a bulb -

operated

suction

tip

(Hot

-Vac De- solder-

ing tool # 7800).

Another

firm manufactures

a

spring -loaded

cylindrical

vacuum unit

which

is

operated

by pushing

an appropri-

ate trigger.

Still

another

firm can

supply

a

small

bulb

-type

rubber syringe equipped

with

a heat -resistant

Teflon

tip.

In

an emergency

-or

as

an alternative

to

the

purchase

of a special

"desoldering"

tool

-one can

use

an

effective,

but

simple,

technique.

Impregnate a piece

of closely

woven copper

braid with non -corrosive sol-

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tool. This truly

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allows you

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desolder any

joint with finger tip ease

and control.

Simply

press

the button to desolder. How about

that)

The

tool

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components

that give

it

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You can select what you

need from:

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INTERCHANGE.

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c

1Ia12O

UNILINE DIVISION

ELECTRONIC TOOLS

I NC.

NEWTON,

KANSAS

CIRCLE NO. 34 ON

READER SERVICE

PAGE

100

POPULAR ELECTRONICS

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