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Avaliado. / 5. Com base em avaliações de clientes
Tape
-Slide
Synchronizer
Continued from page
80
R1 and J2 are added
to the
PK -522
amplifier to make
this simplification
of
operation
possible.
Volume control
R1
is
set
to about
its
mid -range position
for
this
setup.
Shock Hazard
and Grounding.
The yel-
low lead of
the output
transformer
was
grounded
to
the
positive
(+
) battery
termi-
nal in the original PK -522
circuit.
To
completely eliminate
shock hazard
the
printed-
circuit foil
was
cut
leaving the
sec-
ondary ungrounded as shown
at
X in Fig.
2.
A
separate
transformer
power
supply
(T2-
R2
and
C3) provides
DC for
the amplifier
-
eliminating
possible shock
hazards
from this
source. To prolong
its life,
R3 is
used
to
reduce the light output
of the pilot
lamp.
The
value of
C3
must
be
at
least
1000
mf
as it holds the
power
supply
voltage on the
amplifier for good
operation, after
the
AC
supply to T2 has
been cut
off by the motor -
driven cam
switch (S4) in
the slide
changer.
Construction
Details.
Placement
of parts
is not critical.
And
using subassemblies
for
the
amplifier,
SCR switch and
the amplifier
power
supply
makes
for a
neat and
compact
unit
which
should
be
easy
to service
if this
should ever
be necessary.
The photo
of the under
side of the chassis
(Fig. 3) shows
the
location
of parts.
The
PK -522 amplifier
is shown fastened
to
the
right side
of the
chassis
box
on
3/a -inch
stand
-off insulators.
These can easily
be
made
from
test -lead
handles
or
banana -plug
insulators.
The SCR -diode
bridge switch
(SCR
I, Z1,
D1, R2
and
C4) is mounted
on
a phenolic
panel and fastened
to
the left side
of the
cabinet
with 1/2-inch
spacers.
The power
supply
(Z2 and
R3) is
mounted
on another
small
phenolic panel
which is then
attached
to the
bottom side
of
the
chassis
box
with
1/2-inch spacers.
T2
is mounted direct
to the
lower
side
of chassis
as shown.
Fig.
4
is a photograph
of the
Tape
-Slide
Synchronizer
and
shows,
in conjunction
with Fig.
3,
the location
of the
other
components.
Cables.
The
two -wire
power
cable
which
connects
the slide-
changer
unit
to the
Tape -
Slide
Synchronizer
has a
4- contact
plug
number
Jones
P-
304
-CCT on
one end
which
mates
with the
original
Jones
4-
contact
socket S- 304
-AB
on the
slide changer.
The
other
end
of the power
cable
has a
female
Jones cable socket
S- 304
-CCT
which mates
with
a
male
chassis
plug
P-
304
-AB on the
Tape
-Slide
Synchronizer.
The female
Cinch
-Jones chassis
socket
S- 304 -AB shown
on
the chassis
is not
essen-
tial unless the
original
remote pushbutton
cable
operation is desired.
The shielded
wire
connecting
the synchro-
nizer
unit
with the recorder
has a
miniature
phone plug on
one end
and
whatever
type
fittings needed (on
the other end)
to mate
with
the input
and output
of the particular
recorder
used.
Conclusion.
The Tape -Slide
Synchronizer
can
be
used
with
any
stereo
-tape
record/
playback
unit and
practically
any
remote
-
pushbutton-
operated
semiautomatic
slide
changer.
Adequate gain
is available
from
the
3- transistor
amplifier
to
operate
with the
preamps
of most
stereo
tape
decks.
Further-
more,
if desired,
a small
crystal
microphone
can
be plugged
into
the
synchronizer's
input
for
voice operation
of the
slide
changer
and
simultaneous
recording
of the
sync
signal
on
the tape.
Since
the
Tape
-Slide Synchronizer
is
all
solid
state
there
are
no relays,
contacts
or
moving
parts
to
wear
out.
This
unit
has been
in
service
for
nearly a year
and
has
required
no service
of any
kind to
date.
Perfect
synchronization
of
commentary
and slides
is
assured
at all times
because
the
sync
pulse
and
commentary
are
recorded
on
a
single 2 -track
tape.
International
Crystal
C -1
2B
Continued
from
page
58
"wo- o -of,"
or "hello-
o -o -o,"
the C -12B
indi-
cated
somewhat
in
excess
of
90%
modula-
tion.
The
actual
scope
value under
these
conditions
was 100 %.
Summing
Up.
The C -12B
frequency
me-
ter, functioning
as a
frequency
meter,
preci-
sion
signal
generator,
RF power
output
me-
ter, and
modulation
meter,
essentially
per-
forms
all
the
tests
required
to
insure
a CB
set
is
completely
legal in
its operation
and
that it
is performing
at
optimum
efficiency.
We
therefore
recommend
it
as
a
must -have
item for any
shop
doing
CB
servicing.
The C -12B
is
priced
at $300.00.
Additional
information
is available
from
Dept.
RF,
In-
ternational
Crystal
Mfg. Co.,
18
N.
Lee, Ok-
lahoma
City,
Okla.
73102.
RADIO-TV
EXPERIMENTER
- 'RADIO-TV 0
- RIGMAROLE 1
- WHITE'S 2
- Canadian 2
- Television 2
- Stations 2
- - Brit 3
- - R. Martinique 3
- R -TV Moroc:o 4
- - Sawt al 5
- - R. Australia 5
- LIBRARY 6
- Future." 7
- EDI (Elec 7
- .,1,1,,,,11 8
- Tape Sings 9
- - United 9
- - R. Budapest Accra 9
- :.e.: 10
- Amazing" 11
- W. SAMS 12
- Synchronizer 13
- Crystal 13
- LAFAYETTE 14
- \:11,! 15
- -RADIO WITH NRI 16
- GIVES YOU 17
- - nothing 18
- GIMMICKS 19
- New Products 20
- '/ 21
- Products 22
- TV-RADIO 23
- Electronic 25
- Equipment 25
- _ reduced make 26
- Station 27
- -If you 28
- -C. B., Seattle, Wash 29
- -R. K. 30
- Ask Me 31
- S' 32
- Another 33
- -A. A. 33
- Don't 34
- -plus and Filament 35
- C>>i_ 36
- COURSES 37
- -R. M. 38
- ... a fabulous 39
- - 11/2 vdc 40
- ARV- MARCH 41
- All One 42
- Honorary 43
- A photorecorder 44
- For the new 45
- /FM table 46
- -in. speak 47
- -in. hole 47
- RADIO-TV 48
- You won't 49
- -if you 50
- CB operator 51
- 10 meters) 52
- It's 53
- -a task 54
- MARCH, 1967 56
- -it's 57
- -and solder 58
- 1,000 OHMS 59
- Personal 60
- EQUALIZING 61
- Insulates 62
- EXPERIMENTER 63
- For example 64
- Exclusive 65
- To Do? 66
- -MARCH 67
- INSTANT 68
- "NEW 69
- TNE°NEIIV 71
- MOD" 71
- 71 in. long 72
- (LEM) when they land 73
- -a Magnecord 74
- Features 75
- (monitoring) 75
- (auto -stop) 75
- Antenna 77
- FEBRUARY 78
- -circuit is for 79
- 2' /a 80
- SHOPPING 81
- `i' J7 82
- TAPE-GLIDE 83
- '"" 84
- -3- transistor 85
- TAPE -SLIDE 86
- -" 87
- I yawned 88
- 31 meters 88
- Of What 89
- $119" 89
- From Heath 90
- Receiver 91
- STEP UP 92
- "N" 92
- Propagation 93
- /March 1967 93
- 1%), the question is 94
- Ford is 95
- -are the 96
- Sound -Box -On 97
- F la. I000d 99
- 910 -329.5 100
- 1 210 -247.8 102
- -making 103
- 1310 -228.9 105
- 1340 -223.7 105
- !1 C. 1000 107
- Will Jacksonville 109
- Frequency 110
- Commercial 111
- IO CND-TV 112
- I Location C.L 113
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