Fail-safe "and" gate circuit

Details Fail-safe "and" gate circuit Fail-safe "and" gate circuit

H - Electricity

03

K

328/136

H03K 19/007 (2006.01) H03K 3/282 (2006.01) H03K 3/70 (2006.01) H03K 5/26 (2006.01)

Patent

CA 1139849

(Case No. 6978) ABSTRACT OF THE DISCLOSURE A fail-safe AND logic circuit including a free-running multivibrator and a pair of voltage reference networks. The multivibrator includes a pair of common emitter transis- tor amplifiers. The transistor amplifiers are separately biased and powered by an individual one of a pair of voltage reference networks so that a.c. oscillations are produced by the multivibrator when a separate negative-going pulse coin- cidentally appears on both of the pairs of voltage reference networks.

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