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  Automatic Frequency Control

Introduction to Automatic Frequency Control (AFC)

Automatic frequency control stage automatically controls the variations in horizontal frequency. Therefore it is known as Automatic Frequency Control.

CONSTRUCTION

Horizontal synchronize pulses are applied at the common cathode ends. Fly back pulses from LOT is converted as we described in tooth waves and delivered in series along with the diodes.

OPERATION

In reverse and equal voltage is acquired at the common cathode of two diodes. If the variation among the horizontal synchronize and fly back pulses, high output voltage is also low. The output of AFC is pulsating dc.

C, R, C2 work as AFC filters and after that converts it into pure Dc. This is termed as AFC control voltage. This control voltage locks the horizontal oscillator to allow it to keep 15,625Hz constant. Therefore horizontal rolling of picture and beaming are received and a stable picture is acquired.

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