Self-oscillating sawtooth current deflection generator

Details Self-oscillating sawtooth current deflection generator Self-oscillating sawtooth current deflection generator

1979-09-20

1980-11-18

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2970, H01J 2976

Patent

active

042348285

ABSTRACT:
Disclosed is an SCR-analogue, dual coupled transistor vertical oscillator for synching the vertical sweep in a video display with vertical synchronization input signals. Capable of stable, free-running oscillation at two, variable DC levels, the coupled transistor configuration in combination with a capacitor generates a precisely defined sawtooth voltage waveform for controlling vertical sweep and flyback. This combination provides an inexpensive, flexible means for synchronizing sweep drive circuitry operating at various DC coupled levels with a wide range of synchronization input signals.

REFERENCES:
patent: 3435282 (1969-05-01), Barchok
patent: 4110666 (1978-08-01), Farina
patent: 4122363 (1978-10-01), Zappala et al.

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