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Panasonic Technics SL-1900 - Block Diagram

Panasonic Technics SL-1900
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m@
Explanation
of
each
part
1.6.7.4.
METHOD
(BACK
ELECTROMOTIVE
FORCE
FREQUENCY
GENERATOR)
Making
use
of
the
back
electromotive
force
that
is
generated
in
the
drive
coil
winding
of
the
motor
as
a
frequency
generator,
the
frequency
of
the
frequency
generator
is
converted
to
the
number
of
revolutions
for
the
turntable.
After
shaping
the
wave
form
of
this
back
electromotive
force,
it
is
composed
togically,
and
a
frequency
is
generated
that
is
proportional
to
the
number
of
revolu-
tions.
This
is
the
use
of
the
B.F.G.
Making
use
of
the
drive
coil
winding,
trequency
generator
coil
windings
and
magnets
are
not
necessary,
yielding
a
motor
struc-
ture
that
is
very
Compact.
2.
FREQUENCY-VOLTAGE
CONVERSION
CIRCUIT
Being
composed
of
a
trapezoidal
wave
oe
circult,
cuit,
‘the
B.
F.
G.
output
fonuecey
i
is
:
converted
to
aor
tage,
and
contro!
output
voltage
is
generated
in
order
tc
Maintain
the
rotational
speed
of
the
turntable
at
a
cons-
tant
level.
@
Block
diagram
prrewuemene
+:
chs
+
Apthiteimamaneenepeseennenenyiniebbhilntebierremrerenmmntin
tein:
4
SbeebbhhibbbbbbNbENe-H
it
AAANAI
INE
Motor
Orive
Circuit
IC?
ANB3G
WB.
FG
Drive
Coit
Oaciiletxar
Circuit
Orive
Cirevit
j
L_@
7
16)
i
Three
eet
Switches,
Position
Signal
Cail
=
34.
OPERATION
CONTROL
CIRCUIT
The
operation
control
circuit
functions
as
a
control
aut-
Put
voltage
control
keeping
the
rotationa!
speed
of
the
turntable
constant
with
regard
to
the
start
of
turntable
operation
and
the
oparation
of
the
mechanism.
With
this
circuit,
transient
response
characteristics
and
start-
ing
characteristics
are
very
goad.
4.
OPERATIONAL
AMPLIFIER
{OP
AMP}
ACTIVE
FILTER
Because
of
using
an
operational
amplifier
in
the
active
filter,
an
ideal
filter
operation
is
possible.
AS
a
result,
such
high
performance
as
a
signal-to-noise
(SN)
ratio
of
60
dB
(IEC-8)
and
a
wow-and-flutter
level
of
0.03%
(WRMS}
have
been
achieved.
S.
DRIVE
CIRCUIT
By
incorporating
a
large
capacity
power
transistor
in
the
integrated
circuit,
a
starting
torque
of
1
kg-cm
can
be
obtained.
By
means
of
this
large
starting
torque,
prompt
Starts
have
been
realized.
6.
THREE
DIFFERENTIAL
SWITCHING
CIRCUITS
By
means
of
the
signal
from
the
position
signal
coil,
the
starting
circuit
power
transistor
selector
operates,
_
Obtaining
smooth
rotation.
fos
OOO
RN
NEE
OR
Aer
be
|
Circuat
}
Rotary
Speed
|
|
Adpustrnent
|

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