Circuit for generating a clock signal at an AC line frequency

Details Circuit for generating a clock signal at an AC line frequency Circuit for generating a clock signal at an AC line frequency

1985-07-30

1987-06-09

Miller, Stanley D.

Electrical pulse counters, pulse dividers, or shift registers: c

Applications

Measuring or testing

307252N, 307261, 328 28, 328 63, 368156, G01D 0000, H03K 1760, H03K 500, H03K 508

Patent

active

046726420

ABSTRACT:
A periodic signal, at the frequency of the AC mains supply voltage, contains signal pulses, each having a duration that is substantially shorter than half the period of the AC mains supply voltage. The periodic signal is coupled to a high frequency transformer to form a periodic output signal that is applied to a time-of-day measurement circuit that provides time-of-day display information for a television receiver. The transformer provides conductive isolation between the time-of-day measurement circuit and the AC mains supply voltage source.

REFERENCES:
patent: 3183372 (1965-05-01), Chin
patent: 3576467 (1971-04-01), Gupte
patent: 3639782 (1972-02-01), Lord
patent: 3862439 (1975-01-01), Coccio
patent: 4040247 (1977-08-01), Haydon
patent: 4052623 (1977-10-01), Loberg
patent: 4068465 (1978-01-01), Bacon
RCA Color Television Basic Service Data for CTC 111 chassis series dated 1983, cover page and schematic pp. 36-38 attached.
RCA Projection Television Basic Service Data for CTC 132 chassis series dated 1984, cover page and schematic pp. 44-46 and 59-61 attached.

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