Power supply and deflection circuit providing multiple scan rate

Details Power supply and deflection circuit providing multiple scan rate Power supply and deflection circuit providing multiple scan rate

1983-05-25

1986-05-13

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315371, H01J 2970, H01J 2956

Patent

active

045889295

ABSTRACT:
A power supply and deflection circuit for a video monitor provides multiple horizontal scan rates. A switch is used to select the desired scan rate. Operation of the switch determines the proper operating voltage level for the horizontal deflection circuit. A zener diode provides a high or low signal in response to the level of the determined operating voltage. The horizontal oscillator frequency and the value of the S-shaping capacitor is determined in response to the high or low signal. The operation of the switch, therefore, provides the necessary circuit parameter changes for each of the horizontal scan rates selected.

REFERENCES:
patent: 3582706 (1971-06-01), Thomas
patent: 3784872 (1974-01-01), James
patent: 3786303 (1974-01-01), Hilburn
patent: 3816792 (1974-06-01), Spencer, Jr.
patent: 3887842 (1975-06-01), Owens, Jr. et al.
patent: 4302708 (1981-11-01), Spilsbury
patent: 4353013 (1982-10-01), Lehman
patent: 4501995 (1985-02-01), Olmstead et al.
Schematic of Scan Borad for Conrac Video Monitor, Dated 3/17/81.
Conrac Technical Manual 7111/7211 RGC Color Monitor.

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