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Akai GX-F44R

Akai GX-F44R
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High
level
Low
level
Schematics
1
to
4
show
the
flow
of
signal
of
the
main
pass
route
and
of
the
side
chain
route
in
each
mode.
Main
transistors
in
the
circuit
shall
be
explained
briefly.
1)
TR4:
ON
only
when
Dolby
C-type
is
used,
and
the
spectral
skewing
circuit
is
connected.
2)
TR7,
8
and
9:
ON
when
Dolby
B-type
is
used
or
Dolby
NR
is
OFF,
and
the
processor
of
the
low
level
stage
is
disconnected
and
the
circuit
con-
stant
of
B-type
is
set.
3)
TR12
and
13:
Because
Dolby
C-type
consists
of
two
stages,
high
level
stage
and
low
level
stage
as
shown
in
Fig.
16,
the
operating
point
must
be
smoothly
switched
over,
otherwise
abnormal
operation
will
occur.
For
this
reason,
a
close
coupling
circuit
consisting
of
TR12
and
13
is
used
to
make
the
operation
smooth.
Unnatural
operation
when
not
smooth
Fig.
16
19

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