Epson L90P - TM Two-color Thermal Line Printer Manual de usuario descargar pdf (Pagina 90)

introducing

..

S -DeC

breadboard

i1

dr

for

easier

circuit

building

An S -DeC

contains

70

push

-in contact

points

which

are arranged

in two

sets

of

five

numbered rows

with

each

five

points

joined

together by a

leaf-

spring busbar;

this pattern

is

similar

to that used in pop-

ular

wiring

boards. Larger circuits can be

made by keying units together

to form

a

continuous breadboard

of

any

size.

Components are simply

pushed into the

sockets

where they are held

securely by

double -leaf

phosphor-

bronze contacts.

This

system ensures a good

wiping

action

on

insertion

and

withdrawal, giving

low

contact resistance. The

accessory kit pro-

vides

solderless connectors to use with

controls

which

are mounted

on a panel

slotting into the

S -DeC

base.

S -DeC

with

control

panel,

jig, accessories

and

project leaflet. $5.75

each

DeC

STOR

-Two

decks, control panel, jig,

accessories, project leaflet with

com-

ponents tray

all

in

black plastic

box.

$11.75 each

4 -DeC

Kit -Four

decks, two

control

panels,

jigs, accessories,

and project

book in

attractive plastic

case.

$20.75 each

INTRATEC

399

Jefferson

Davis

Highway

Arlington, Virginia 22202

Please send me postage

paid:

5 -De C's @

DeC STÖR

@

4 -De C's @

$5.75 each

$11.75

each

$20.75 each

1 enclose a check /money order for

$

Va.

residents add 4% sales tax

Money refunded If not

satisfied.

Name

Address

City

State

Zip

Code

Box PE

CIRCLE

NO. 4

ON

READER SERVICE

PAGE

98

9

have

4- ampere, 35 -watt

ratings

and are of-

fered

in equivalent

pairs

in 40,

60, and

80 -volt versions.

Specifically designed

for

direct -coupled,

symmetrical

push -pull am-

plifier

applications,

the entire

series fea-

tures

Motorola's

exclusive Thermopad

plas-

tic

package

(Fig. 4).

DRIVE

SOURCE

2N5190 -92

OUTPUT

2N5193 -

95

Fig. 4. Complementary

silicon transistors

have 4.

ampere, 35

-watt ratings

in

voltages

from 40 to 80.

The Amperex

Electronic

Corporation

(Sla-

tersville,

R.I. 02876)

has announced

the

development

of a radically

new emitter

ge-

ometry

for

r.f. power

transistors.

Illustrated

in Fig.

5, the new

geometry

results

in de-

vices

with excellent

tolerance

for the

large

overloads

often encountered

in VHF

trans-

mitters,

thus

insuring

fail -safe

operation

while permitting

high power

outputs.

Eight

types are

available,

with

voltage

ratings of

either

12.5

or 28

volts, and

power

outputs

ranging

from 3

to 22 watts.

Carrying

type

numbers

A270

through

A277,

the new

units

are

intended

for use

in transmitters

operated

in the

175 -MHz

band.

Solid -state

microwave

devices

utilizing

exotic

traveling

-wave

techniques

have

been

developed

by two

major

firms. One

device,

designed

by GE

engineers

Harold

C. Bow-

ers

and

Thomas

A.

Midford,

is a diode

amplifier

in the

form of

a strip transmis-

sion

line,

with

the

traveling

-wave signal

amplified

as

it

propagates

along

the diode's

strip

-like

junction.

The

other device,

an-

nounced

by Stephen

Yando

and

Dr. C.

Fischler

of General

Telephone

and Elec-

tronics

Laboratories,

features

a piezoelec-

tric

crystal

bonded to a

semiconductor

wafer.

In

this

unit, the

input signal

is

applied to

a pair of

electrodes

at

one end

of the

crystal

and

converted

into a

moving

acoustic

wave.

Amplification

occurs when

the

traveling

field

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