Memorex CP8 TURBO UNIVERSAL REMOTE CONTROL Manual do Utilizador descarregar pdf (Página 8)

100

LETTERBOX

In fairness,

however,

there

appears

to be

some problems with

instruction

clarity. We were

concerned

enough

about it

to do a survey,

which

revealed

that about

a third

of users had

some

degree of

difficulty with

them.

As a

result, we

have

revised

the manual

and

have

added a short

-form instruction

sheet. And we

are working

a new

version

of the

watch

for 1989

that

will

be less

complex,

and easier

to program.

Frank

J. Bianco, President

Elexis

Corporation

7000

N.W. 46

Street

Miami,

FL 33166

were

glad to

learn that

the

Calo-

rie Watch

and its

manufacturer

are still

around.

The

short form

instruction

sheet

you provided

does

seem to

answer some

the serious reservations

our reviewer

raised; we've

sent a copy

to him

so that

can do

a more thorough

review

your product

at some

future

date.

Dot's

All

I have

enjoyed

building

several

the outstanding

projects

that you've

pre-

sented

in the

pages of

Hands -on

Elec-

tronics. I

have even

enjoyed

the occa-

sional printing

miscues

that

crop

up,

since

they spur

me on

to educate

myself

basic

electronics.

One that has

me stumped,

however,

is the "Power

Play"

bench -top

supply

that appeared

the February

1988 is-

sue.

I can't

seem

vary

the

0- to

30-

volt

output. All

other parts

the cir-

cuit seem

work

fine. What

gives?

-J.K.R.,

Cooperstown, NC

One of those

occasional

miscues!

seems

that the

artist left out

a rather

important

connecting

dot in the

sche-

matic (Fig.

I ). Notice

that the

line be-

tween

the anode

of D2

and the wiper

of R2

crosses

the line

between the

UIl

C3 junction

and the

/R2

junction.

There

should

be a

connection

at that

crossing point.

Add

it and

everything

should work

as intended

By the way,

while

you're

at it, there

two other typographical

errors we

should

point out:

in the schematic,

should

be a 0.33

-µF unit, while

the

Parts

List,

should

be a 0.1 -µF

unit.

Indexes Available

I've been

reading your

magazine

for

over two years now.

One thing

that has

always impressed

me is how well

you

respond to your

readers'

needs.

I've noticed

that you

run

advertise-

ments

for your

Reprint

Bookstore

occasion. I'm

sure that

I would

be in-

terested

in some

of the articles

in your

back issues,

but I have

way

of know-

ing what

appeared

in a specific

issue.

Is it possible

to obtain

a comprehensive

bibliography

of all back

issues

to date?

I'm

sure that

other readers

would

interested

in that information

well.

-K.J.,

St. Louis,

Annual

indexes

for 1986

and /987

are

currently

available

to all Hands

On Electronics

readers

at no

charge.

To get

one, just

send

self-

addressed

stamped

business

-size

envelope

Hands

-On Electronics,

Annual Index,

500 -B

Bi-

County Blvd.

, Farmingdale,

11735.

Be sure

to tell us which

year

you are

interested

in.

Wrong

Division

First of

all, I

would

to say

that

you

have a great

magazine;

please

don't

change

a thing.

However,

I believe

that

you've

got a

couple of

errors in

the May

1988 installment

of "E -Z

Math."

page

79, when

you

calculate

the

power gain

a circuit,

you state

that

Gain = 70/.005

= 1400;

course, the

ac-

tual result

that division

is 14,000!

That's probably

simply

a typo,

since

when

you

calculate

the

gain in

terms

dB, the

results

are correct

if you

as-

sume

you meant

14,000

everywhere

you

say

1400.

Right below

that,

again on

page 79,

you

use a 100 -milliwatt

signal in

ex-

ample.

But when

you

do the

math, you

use 1

milliwatt

(.001)

signal

instead.

Following

through

on your

original

prob-

lem,

the gain

should

have

been

1000

/0.

/ = /0,000,not

million

you

state.

-R.S. Jackson,

Pen

-Pal

Wanted

I am

an electronics

engineer,

28 years

old,

living in

Poland. I

am interested

audio

and

video

devices,

new techni-

cal solutions,

and particularly

appli-

cations of digital

components

and tech-

niques.

I want

to enter

into correspondence

with

somebody who

is interested

the

same

fields. If you

make it

possible for

me,

will

be very

grateful.

Maybe someone

will

hold out

hand

to me

across the ocean.

Jacek

Lasota

Starowarszawska

6 M 29

97 -300

Piotrkow

Trybunalski

Poland

Hints for Builders

Your idea of

using carbon paper

transfer simple

PC designs

to the board

isn't bad, but ordinary

carbon paper,

especially pencil carbon,

uses a

wax

binder that may

interfere with proper

adhesion of the resist. That

can lead

flaking

or bleeding of the

etchant under

the resist. Also,

the

waxy

lines are hard

to draw over.

A better technique would

be to use

the tracing paper

used by seamstresses

to transfer patterns

to cloth. That trac-

ing paper

uses chalk to transfer the

de-

sign.

Since chalk is water

soluble, it

will wash

out. That

allows the resist ink

to flow more freely and

penetrate bet-

ter,

which

means

that

it will

adhere bet-

ter to the substrate. Seamstress

tracing

paper can be bought

in most sewing

shops, as well as in

the notions

depart-

ment

in many

variety,

craft, and de-

partment stores.

Those shops

also carry another item

that can prove

handy for the electronics

builder: molded

nylon mesh that's in-

tended for

use as backing for

needle-

point

projects. I've found that the mesh

also makes an outstanding

perfboard for

electronics

projects.

The mesh is

usually

sold

in sizes rang-

ing from 2-

to 12- inches square,

and

can be cut to

a desired size or shape

using ordinary scissors.

It is flexible

enough

that it can be curved for

use

space-

saving designs, yet it is

stiff

enough that

even a fairly large

piece is

self -supporting; for

extra large "boards,"

strips

of sheet plastic can be glued

around

the edges for

additional

support.

Stan-

dard mesh has seven holes

to the inch,

which

doesn't readily lend itself

to use

with

ICs, but it works

great

with

dis-

crete components. Simply feed

the com-

ponent leads

through the holes,

twist

them over, and interconnect

them us-

ing point -to -point wiring.

The mesh

can also be used

grill-

work over ventilation

holes, speaker

open-

ings,

etc. Or, to make cages to keep

fingers away

from high -voltage points

components in circuits.

-B.P., Lake Havasu

City,

You've

got two great ideas

there,

B.P.

, and thanks for sharing

them

with

us and our readers.

Now, how

about the rest of you?

you' ve

discovered something that

makes

your

electronics experimenting

or build-

ing

easier,

especially

if its

something

that's

a tad

on the

unusual

side, why

not

share it with

your fellow

hobbyists.

Hands

-On

Electronics

is a great

fo-

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