Casio CZ-1 Service Manual And Spare Parts List

19.
SAMPLE
&
HOLD
CIRCUIT
TC40S3
Function
TaWa
Input
ON
Cnwtntl
A a
L
L
OX,
02
L
H
IX.
OZ
H
L
OX.IZ
H H
IX, IZ
Signal SH
from
Mattar
LSI
^
Signal SH
from
Slava LSI
V~
Mattar
Output
Tht
block
eliminates a
high
frequency
noise
called as
"Glitch"
which appears at
the
end of
the
stepped
waveform.
Signal
SH
from
Mattar LSI
-J
Signal SH
from
Slava
LSI
Input signal
*
Sampling tima
Mattar output
(pin
7
of
tha opamp.)
Slava output
(pin
1 of tha
opamp.)
Pi
When
signal
SH
from Master LSI
is HIGH,
the
switch X
in
TC4053
is
contacted
with
the
terminal
OX.
This
causes
the
input
signal to
pass
through. At
this
time,
the
voltage
level
of the
waveform
is
charged
in the Hold
Capacitor.
On
the other
hand,
while
a
glitch appears on
the
waveform,
the switch X is
contacted
with
the
terminal IX.
This
results
in cutting
off
the
glitch.
Although
no
signal comes out
of
TC4053, the
input of the
opamp
keeps the
same voltage
level
by
discharging of the
Hold
Capacitor.
Sampling
or
holding
the
slave
waveform is
performed
by
the
same
procedures
using
signal
SH
from Slave LSI
and
switch
Z.
-46-

Casio CZ-1 Specifications

General

Brand	Casio
Model	CZ-1
Category	Synthesizer
Language	English