13.2 A TRANSISTOR TELEVISION SWEEP CIRCUIT
In television receivers, magnetic deflection is used due to higher deflection sensitivity. To produce the necessary magnetic deflection, we use current sweeps. For scanning a horizontal line, the frequency of the sweep circuit in a television receiver is 15.75 kHz, i.e., a total time of 63.5µs which is the sum of retrace time or fly-back time (16 µs) and sweep time (47.5 µs). During the sweep period the current must increase linearly with time. For the retracing action, current must reverse the direction to bring the spot for next scanning. The maximum energy stored in an inductor of value L is 1/2(
), ...
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