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Meter Amplifier
The level. meter circuit is outlined in Fig. 7—2.
The
headphone
amplifier output is amplified by
Q118
and rectified by D101, the resultant DC
component
then being applied to IC501
(meter
drive).
This
IC
consists
of 12 comparator
elements
used for level display purposes.
+B is applied to
the
minus
pole
of the comparators
to serve
as
the
reference
voltage
for
each
element,
these
voltages
being
set
at increasingly
higher levels
for each higher level display segment.
DC com-
ponents of the D101 rectified signal are compared
with the comparator reference voltages, resulting
in the lighting up of those
segments
where
the
DC component is higher than the reference voltage.
SL 1
(PINCH SOL.)
(RE So.)
0318
R348
D323
D320
0322
D316
B
AUTO STOP
circutt
D317
Headphone
(REW. SOL. )
"
VR304
D314
Muting Circuit
12 segment
Fig. 7-2 Level Meter Circuit
(REO SOL. )
ao
R356
iW |
R346
NK
cE
op Ul ae
Q320
c335 {+
Ut 0319
stat
4
R347
R345
a
D336
+8
Recording amplifier muting
0330
0334
0337
LINE
OUTPUT
muting
A
D335
Bias
oscillator
S10
Si4
si2
Sry
R365
NO
HOLE | HOLE
S7
PLAY
$10
REW
siz ERASE
PREVENT
DETECTOR
$8
sToP
S11
PAUSE
S14 EJECT
So
FF
s$i2
REC
Si6é TIMER
Fig. 7-3 Control Circuit
14
AUTO
STOP circuit
eo
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