Modulation drive circuit for CRT deflection of television and da

Details Modulation drive circuit for CRT deflection of television and da Modulation drive circuit for CRT deflection of television and da

1985-09-06

1988-04-12

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315365, H01J 2970, H01J 2976

Patent

active

047376937

ABSTRACT:
An LC tank circuit in the collector of a power transistor controls the vertical modulation of the horizontal deflection of a CRT through additional deflection coils properly oriented. The tank circuit is tuned at a frequency nf for the desired modulation, where n is the number of cycles of oscillation of the tank for each drive pulse at a frequency (pulses per second) f, and each drive pulse is adjusted in width to one fourth or less of a cycle of the modulation frequency nf using an adjustable RC differentiating circuit and a threshold device to couple a squarewave signal at frequency f to the base of the power transistor.

REFERENCES:
patent: 2672576 (1954-03-01), Landon
patent: 2807750 (1957-09-01), Hobbs

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