Casio CZ-1 - Page 105

18.
EXPANDER
CIRCUIT
In order
to
extend
the
dynamic range
of
the melody
signal,
a
part of
DAC
output
waveform
is
contracted
and
expanded by
Expander
Circuit.
Exptfldtr
circuit
D
TC4051BP
From DAC IN
>
001002003
From
Music
LSIt
*OUT
TC40S1BP
Function Ttblf
A
a c
••ON"
Ch«nn«4
Amplituc*
L L
L
1
H
L L
1
1/2
L
M
L
2
1/4
H H
L
3
1/8
L
L
H
4
1/16
In
accordance
with
the voltage levels
of
the signals
001,
002 and
003,
one
of
the input
channels
is turned
on.
By the
resistors
connected
to
each
channel,
the
amplitude
of DAC
output varies
from
1 to
1/16.