Casio CZ-1 Service Manual And Spare Parts List

21-3.
Thrte-Phase
LFO
(Low
Frequency
Oscillator)
The
left
figure
shows
three
inverters
serially
connected.
If
LOW
level
input
enters
the circuit,
the
output
becomes
HIGH
level.
Because
of
the
transfer
characteristic
of the
inverter*
the
inverted
input
voltage
appears
on the
output
with
a
time
lag.
Hence,
the
circuit
oscilates
and the
oscillation
frequency
is
determined
by
the
time
lag.
The
following
shows
the
actual
circuit of
the
Three-Phase
LFO.
The
time
lag
is
controlled by
the
parallel connected
capacitor and the
resistors.
Model
CZ-1
employs
two
LFOs
whose
oscillation
frequencies
are
0.56
Hz
and 7.14Hz.
The
output
differs
120
degrees
in
phase.
i\
—
|
II
—I
|
lr
*
* it
OSC1
OSC2
OSC3
OSC3
'120"
120*
Both
0.56
Hz and
7.14
Hz
triangle
waveforms
are mixed
to give
variational
delays
of the
sound
in
the
BBO.
7.14Hz 3-phatt LFO
18K
>
ToVCO
0.56HI 3-PtiM*
LFO
AAA
Ti.e
0.56
Hz and
7.14 Hz waveforms
are
mixed
in the ratio
of
10:1
as
they
pass through
18Kohm
and
180Kohm
resistors,
respectively.
-52-

Casio CZ-1 Specifications

General

Brand	Casio
Model	CZ-1
Category	Synthesizer
Language	English