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V E R T I C A L SECTION . , .. . ,
T h e , input "signal applied -.to;;; V..- INPUT- passes through the
DC coupler (DC) or A C coupler incorporating a capacitor
( A C )
and is then fed to the attenuator; the selection
between the D C coupler and A G coupler is effected by
manipujating V . I N P U T terminals. T h e attenuator provides
setting of 1 , 1/10 or 1/100.so that the input signal may be
attenuated . t o
a certajn - range.,-of voltage that can be
accepted by the .vertical amplifier,
The vertical amplifier is a direct-coupled differential ampli-
fier consisting of F E T Q1 and silicon transistors
allowing stable DC amplification.
HORIZONTAL SECTION
The horizontal section is composed of the synchronizing
input voltage limiting circuit Q 6 , time base sawtooth wave
generator Q7 ~ Q10, horizontal amplifier Q12 ~ Q14 and
the blanking voltage amplifier Q 1 1 .
The synchronizing input voltage limiting circuit suppresses
the synchronizing signal, "picked up from the emitter of Q 5
at the final stage of the vertical amplifier, to a constant
level which is then applied to the sawtooth wave generator,
thus assuring stable synchronization.
The sawtooth wave generator includes the diode D1 for
stabilizing the DC level, while the multivibrator consisting
of Q7 and Q8 generates sawtooth waves. Transistor Q 9
inserted in the emitter circuit of transistor Q8 is a current
V. INPUT
A C
DC
GND
H J N P U T i
Synchronizing
GND
voltage frmitet
F U S E
0 . 3 A
Power fransformer,
primary side
CIRCUIT DESCRIPTION
. . /
,
, ..
Q2. ~ Q 5 ,
;
.
X65-1080-00
Input
circuit
Attenuator
S l a . b
01
Saw-tooth
wave
oscillator
S 2 a - e
07 - 10
0 6
S 3
Fig. 1 B L O C K D I A G R A M O F CO-1506
limiter which improves the linearity of the sawtooth waves.
Transistor Q 1 0 inverts the polarity
perform ing negative-to-positive going sweep so as to meet
the requirements-,in relation to the number of the hori-
zontal amplifier stages which follows.
The
horizontal, .arnpjfier
is a one-stage direct-coupled
differential amplifier consisting of F E T Q12 and silicon
transistors Q 1 3 and Q 1 4 . This configuration ensures stable
DC amplification. That is, a very low speed of sweeping
below 1 Hz can be achieved through H. I N P U T terminal
( 8 ) . / . , /
. . ; . . .
In the blanking voltage amplifier, the negative going pulses
from the Q8 collector are amplified to positive going pulses
which are then
applied to the cathode of C R T , thus
blanking over a range from 10 Hz to 100kHz for ease of
observation on the C R T screen.
POWER SUPPLY CIRCUIT '
The power supply circuit provides +8 V and —15 V through
the voltage stabilizer consisting of zener diodes D2 and D 3 ,
in addition to
180 V
(approx.) through the full-wave
rectifier composed of the diodes D 6 and D7 to supply to
the collector circuit o f the final stage of each amplifier.
HIGH- VOLTAGE;POWER
Thiscircuit^supplies —1500 V through the full-wave voltage
doubter rectifier composed of the high voltage diodes D1
and-02 tothe•••CRT•circuit;""'
v
Vertical ;
amplifier
0 2 - 5
Blanking
circuit
i
01
Horizontal
/amplifier
0 I 2 ~ 14
Power supply
D2 - 7
f
- 15V
4- 1 8 0 V
V
8
of sawtooth waves,
. ' . .
:
SOPPLY CIRCUIT
C R T
1 3 0 B E B 3 1
X68-1130-00
High voltage
supply
Dl ,2
-
1 5 0 0 V
3
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