Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1979-11-13
1981-07-07
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
340628, G08B 2100
Patent
active
042777828
ABSTRACT:
A detection circuit particularly adapted as a smoke detector employes a minimum number of components by a CMOS integrated circuit which receives directly the output of a smoke detector on one of the inputs of an input comparator circuit which provides static input protection and a high input impedence by employing thick oxide layer over the gates of the comparator transistors. The CMOS chip also directly supplies operating current for a mechanical or piezoelectric horn. Further features include a clocked low voltage alarm; a buffer stage to permit the interconnection of a number of different detector circuits in common to a single input/output lead; and a visual LED indicator to indicate that the circuit is operating and to provide a visual indication any time the alarm condition for the circuit has been actuated.
REFERENCES:
patent: 3431557 (1969-03-01), Thomas et al.
patent: 3876999 (1975-04-01), Lee
patent: 3879662 (1975-04-01), Barneck
patent: 4048575 (1977-09-01), Musa
C. D. Driscoll, "Voltage Comparator Circuit", IBM Tech, Discl. Bull., vol. 17, No. 4; Sep. 1974; pp. 1151-1152.
R. L. Hedman et al. "Integrated Comparator with Active Hysteresis", IBM Tech. Discl. Bull., vol. 19, No. 2; Jul. 1976; pp. 634-635.
Caldwell Sr. John W.
Myer Daniel
Supertex Inc.
Weiss Harry M.
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