Introduction to Vertical Oscillator
A saw tooth wave of 50Hz is required for vertical scanning. This stage generates 50Hz waves.
Construction
It relates to the ramp generator type of oscillator. R^l 00K) and C (0.47mfd) are employed as time constants. Biasing voltage from +25 V supply is delivered to the base of transistor -Q by VR, and R^ and to the collector by R3 and R4. Vertical synchronize pulses are provided through the integrator stage by C, A positive feedback is applied to the bakeoff Q, by R, and C2.
Circuit Operation
After delivery is provided, C3 begins charging by Rj. 50Hz saw tooth waves are generates because of the discharge of C3 and delivered to the vertical driven and output amplifier and amplified. A feedback is provided from the output stage to its input. Therefore undamped 50Hz waves are generated. If the base voltage is changed through variable resistor VR, collector current varies. It changes the time of charging and discharging of Cy by Using this, we can change the frequency generated.
VR1 works as V Hold control and assists to generate constant 50Hz saw tooth waves. We can control the rolling of picture by using V hold control.
Throughout transmission, vertical synchronize pulses from the integrator synchronize the vertical oscillator to generate stable picture.
A preset is employed as V size or V Height (VR2). By changing this, we can raise or decrease the height of the picture.
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