Vital code generating circuit

Details Vital code generating circuit Vital code generating circuit

1984-03-27

1986-11-18

Miller, Stanley D.

Oscillators

Plural oscillators

Parallel connected

331 74, 331111, 328 61, 328136, 307528, 307271, 307502, 307274, 307282, 307283, 307301, 307252F, H03B 2700, H03L 700, H03K 906

Patent

active

046238506

ABSTRACT:
A vital low frequency code generating circuit having a pair of complementary unijunction transistor relaxation oscillators for producing coincidental pulses in the absence of any failure; and a first initially nonconductive transistor amplifier and a second initially conductive transistor amplifier for saturating a square loop core transformer in a positive direction. The coincidental pulses causing the first transistor amplifier to be rendered nonconductive to unsaturate the square loop core transformer and causing the second transistor amplifier to be rendered conductive to saturate the square loop core transformer in the negative direction, which results in the development of output code pulses only when neither of the relaxation oscillators has drifted appreciably.

REFERENCES:
patent: 3206684 (1965-09-01), Der et al.
patent: 3909731 (1975-09-01), Milovancevic
patent: 3956704 (1976-05-01), Keeney, Jr. et al.
patent: 3965432 (1976-06-01), Denenberg et al.

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