Cathode ray tube deflection circuit having display format...

Details Cathode ray tube deflection circuit having display format... Cathode ray tube deflection circuit having display format...

H - Electricity

01

J

355/19, 375/46

H01J 29/70 (2006.01) G09G 1/04 (2006.01)

Patent

CA 1137238

- 1 - ABSTRACT A cathode ray tube deflection circuit is described which selects between two display formats in response to a format control signal. A horizontal deflection portion includes the primary winding of a flyback transformer resonant with a horizontal deflection yoke. Switches are connected across a portion of the primary winding and across portions of the yoke. A logic unit, in response to the control signal, actuates each of the switches to change the resonant frequency of the horizontal deflection circuit. The logic unit correspondingly changes the frequency of the horizontal drive signal and the amplitude of the vertical sweep. Haak 5

348575

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