High gain sensing and switching means for smoke detectors

Details High gain sensing and switching means for smoke detectors High gain sensing and switching means for smoke detectors

G - Physics

08

B

358/21

G08B 17/00 (2006.01)

Patent

CA 1074025

ABSTRACT OF THE DISCLOSURE A smoke detector of the ionization type is provided with high gain sensing and switching means for detecting the presence of airborne products of combustion in a measuring ionization chamber. Sensitive and stable operation is achieved through the use of a field effect transistor in combination with a plurality of cascaded switching element.

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