Elenco Electronics MO-1251 Manual de usuario Pagina 52
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Radio-
o 0
Electronics
írC -Gil=
THE MODEL WTT -20 IS
ONLY THE SIZE
OF
A DIME, yet transmits
both sides of a tele-
phone
conversation to any
FM radio
with
crystal clarity.
Telephone line
powered
-
never
needs
a battery! Up to
v, mile range.
Adjusta-
ble
from
70
-130
MHZ. Complete kit
$29.95
+
$1.50
S
+
H. Free
Shipping on 2 or
more!
COD add
$4.
Call or send
VISA. MC.
MO.
DECO INDUSTRIES,
Box 607, Bedford
Hills, NY 10507. (914) 232 -3878.
CIRCLE
127
ON
FREE
INFORMATION
CARD
Nos
CABLE
TV
CONVERTERS
AND DE-
SCRAMBLERS
SB -3 $79.00
TRI -BI $95.00
MLD-
$85.00
M35B
$89.00 JRX
-DIC
$129.00
Special combos
available.
We
ship COD.
Quantity
discounts. Call
for pricing
on other
products. Dealers
wanted. FREE
CATALOG.
We
stand behind our
products
where others
fail.
One year
warranty.
ACE PRODUCTS,
P.O. Box 582, Saco,
ME
04072
(207)
967 -0726.
CIRCLE
183 ON
FREE
INFORMATION
CARD
PREVENT PHONE MISUSE, selectively
re-
strict
Long Distance
/Outgoing
calls. Get
printed
record of Date,
Number Dialed,
Start/
End timings, Durations of all Outgoing calls
and
Timings, Durations of incoming calls;
using
Telephone Activity Monitor, TAM model
88 -U.
Memory,
800 calls.
List
$195.00.
Intro-
ductory
$156.00
+
$6.00
S&H.
NJ residents
6%
tax. Phone
orders
(609) 393 -7474,
Visa/
Mastercard. ELECTROSALES CORP OF
AMERICA,
INC., 1555 Brunswick
Avenue,
Lawrenceville,
NJ
08648.
CIRCLE 182
ON FREE
INFORMATION
CARD
SIMPLY SNAP
THE WAT -50 MINIATURE
FM
TRANSMITTER
on
top
of
a 9v battery
and
hear
every
sound
in
an entire
house
up to
1
mile
away!
Adjustable from 70
-130
MHZ.
Use
with
any FM radio.
Complete
kit
$29.95
+
$1.50
S
+
H.
Free
shipping on
2
or
more! COD
add
$4.
Call
or send
VISA, MC. MO. DECO
INDUSTRIES,
Box 607, Bedford
Hills. NY
10507.
(914) 232-3878.
CIRCLE 127
ON FREE
INFORMATION
CARD
CALL
NOW
AND
RESERVE
YOUR
SPACE
6 x
rate
$890.00 per
each
insertion.
Fast reader
service cycle.
Short lead time for
the
placement of
ads.
We typeset
and
layout
the ad at
no
additional charge.
Call
516 -293 -3000 to
reserve
space.
Ask
for
Arline Fishman. Limited
number
of
pages available.
Mail materials
to:
mini -ADS, RADIO -ELECTRONICS,
500 -
B Bi-
County
Blvd.,
Farmingdale, NY
11735. FAX: 516-293-3115.
SECURITY SYSTEM
continued from page
52
receiver)
for the best reception.
Fi-
nally, disconnect
all the
test probes
and reinsert IC2.
If
necessary, fine
-tune LI (on
the
RF
transmitter) to minimize
the trans-
mission of
a second harmonic, which
may be heard
on an FM radio
tuned to
approximately
100
MHz.
Installation
and
operation
The range of
the IR
beam is inver-
sely proportional
to the intensity
of
the
ambient light,
and is typically a
maximum of
18 feet. The system
is
designed to operate
under low- inten-
sity lighting.
Although strong
fluores-
cent lighting has
little effect
on the
system,
bright daylight
and bright in-
candescent lighting will
reduce
the
maximum
range
of the IR beam. For
operation
under modest
amounts of
daylight
and /or incandescent
light-
ing,
a simple light shield
can be con-
structed
from black
tubing installed
over over phototransistor
Q1
and
LDRI, as
shown in Fig. 10
Keeping in mind the effects of ex-
ternal light sources,
mount the IR re-
ceiver/RF transmitter
on a wall or a
pole across from the intended location
of the IR
transmitter.
With
the IR re-
ceiver securely mounted, attach
the
audio amplifier /speaker to TP1. Ap-
ply power
to both the
IR
receiver
/RF
transmitter and the IR transmitter.
Holding the IR transmitter
approxi-
mately where you intend to mount
it,
align the two devices
while listening
to the 1500 -Hz tone from the ampli-
fier. The IR beam is correctly aligned
when
the
1500 -Hz
tone
sounds the
loudest,
and the
IR
transmitter
is
within range
when
the 490 -Hz tone
dies
out.
An alternative alignment method is
to connect a piezo buzzer to TP3. The
buzzer
will
continuously
sound until
the
IR
transmitter
and the IR receiver
are
properly
aligned and
within
range, at which time the buzzer
abruptly stops.
Next,
decide on a location
for the
RF receiver. The
range of the
RF
transmitter is approximately
100 feet.
You may keep the receiver
portable.
You may want to consider
addi-
tional
locations to be monitored,
such
as a driveway, a garage,
or the en-
trance to
a swimming pool.
The sys-
tem is adaptable
to many interesting
projects.
R -E
- SYSTEM\ 0
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