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Vertical
Oscillator
F,B)
vcc 2
Vetical Frame
Vcc 2 Generator
1
Oscillator
1
Frame-Synchro
Generator
Line Fly Back Phase
Input Detector
Horizontal
Oscillator
Vertical
output
Power
Amplifier
Input
Horizontal
output
Figure 4, BLOCK DIAGRAM OF THE TEA 2037A
3. COMPOSITE VIDEO INPUT AND HORIZONTAL/
VERTICAL DEFLECTION
3-l VIDEO INPUT (PIN 15) 3-3
The detection level for negative sync pulse at the
sync separation input (pin 15) is set at 1.6V. When
the voltage at emitter of the Transistor (pin 15) is
above
1.6V, the transistor is cut off. Voltage
lower than 1.6V enables the transistor to conduct
and the internal circuitry
is
enabled for
synchronization function.
3-4
LINE (H) OSCILLATOR (PIN 9)
The line oscillator is of the type which charges and
discharges a capacitor, since a perfectly linear
sawtooth wave form is not required.
The free running frequency is dependent on C705,
R705 and VR702 and is governed by this expres-
sion To = 085 x C705 x R705 where To is the line
oscillator free running frequency.
FRAME(V) OSCILLATOR (PIN 9)
Oscillator thresholds are internally fixed by
resistor C601, R603 are used to determine the
free-running frequency, the oscillator
free-running frequency is given by To = 0.15 x
C601 x R603.
3-2 COMPOSITE VIDEO INPUT (PIN 15)