Epson L90P - TM Two-color Thermal Line Printer Manual de usuario descargar pdf (Pagina 25)

¡near

for

Cs

the

Low

-cost

package

Experimenter

IC's

has

many

uses -like

building

an FM

wireless

mike

April,

969

By this time,

most everybody

who has

done any

electronics

experimentation

knows

what

an

integrated

circuit is,

but

he

may

not know

how

to use

one. He

knows

that

many

integrated

circuits

(IC's)

can contain

a

number

of

transis-

tors,

diodes,

and resistors

in

a very

small

package

and that

they can

be used

to

form

some

very

complex

circuits. Integrated

circuits

come in

a variety

of package

shapes.

Some are

about the

size

of a

standard

TO -5

transistor

case

but they

have

10 leads

instead

of

the 3

or

4

need-

ed

for

transistors;

others

are in flat,

rec-

tangular, "in-

line"

packages

with 14

or

more

pins.

Whatever

the

shape,

the

uses for

IC's

are myriad.

This

was not

always the

case. A few

years

ago, it

was very expensive

to

pro-

duce IC's

and they

were used

primarily

in

digital

applications.

A large -scale

digi-

tal computer

uses literally

thousands

of

the

same IC flip

-flop

so costs

can

be

spread

over

high -quantity

production.

(Digital IC's

are of

the on -off,

two -volt-

age -level type.)

27

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